Yucca
Overview
Yucca is a genus
Genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of perennial
Perennial plant
A perennial plant or simply perennial is a plant that lives for more than two years. The term is often used to differentiate a plant from shorter lived annuals and biennials. The term is sometimes misused by commercial gardeners or horticulturalists to describe only herbaceous perennials...

 shrub
Shrub
A shrub or bush is distinguished from a tree by its multiple stems and shorter height, usually under 5–6 m tall. A large number of plants may become either shrubs or trees, depending on the growing conditions they experience...

s and tree
Tree
A tree is a perennial woody plant. It is most often defined as a woody plant that has many secondary branches supported clear of the ground on a single main stem or trunk with clear apical dominance. A minimum height specification at maturity is cited by some authors, varying from 3 m to...

s in the family
Family (biology)
In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 Asparagaceae
Asparagaceae
Asparagaceae is the botanical name of a family of flowering plants, placed in the order Asparagales of the monocots.In earlier classification systems, the species involved were often treated as belonging to the family Liliaceae...

, subfamily Agavoideae. Its 40-50 species are notable for their rosettes
Rosette (botany)
In botany, a rosette is a circular arrangement of leaves, with all the leaves at a single height.Though rosettes usually sit near the soil, their structure is an example of a modified stem.-Function:...

 of evergreen
Evergreen
In botany, an evergreen plant is a plant that has leaves in all seasons. This contrasts with deciduous plants, which completely lose their foliage during the winter or dry season.There are many different kinds of evergreen plants, both trees and shrubs...

, tough, sword-shaped leaves
Leaf
A leaf is an organ of a vascular plant, as defined in botanical terms, and in particular in plant morphology. Foliage is a mass noun that refers to leaves as a feature of plants....

 and large terminal panicle
Panicle
A panicle is a compound raceme, a loose, much-branched indeterminate inflorescence with pedicellate flowers attached along the secondary branches; in other words, a branched cluster of flowers in which the branches are racemes....

s of white or whitish flower
Flower
A flower, sometimes known as a bloom or blossom, is the reproductive structure found in flowering plants . The biological function of a flower is to effect reproduction, usually by providing a mechanism for the union of sperm with eggs...

s. They are native to the hot and dry (arid
Arid
A region is said to be arid when it is characterized by a severe lack of available water, to the extent of hindering or even preventing the growth and development of plant and animal life...

) parts of North America
North America
North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...

, Central America
Central America
Central America is the central geographic region of the Americas. It is the southernmost, isthmian portion of the North American continent, which connects with South America on the southeast. When considered part of the unified continental model, it is considered a subcontinent...

, South America
South America
South America is a continent situated in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. The continent is also considered a subcontinent of the Americas. It is bordered on the west by the Pacific Ocean and on the north and east...

, and the Caribbean
Caribbean
The Caribbean is a crescent-shaped group of islands more than 2,000 miles long separating the Gulf of Mexico and the Caribbean Sea, to the west and south, from the Atlantic Ocean, to the east and north...

. Early reports of the species were confused with the cassava
Cassava
Cassava , also called yuca or manioc, a woody shrub of the Euphorbiaceae native to South America, is extensively cultivated as an annual crop in tropical and subtropical regions for its edible starchy tuberous root, a major source of carbohydrates...

 (Manihot esculenta). Consequently, Linnaeus mistakenly derived the generic name from the Carib
Carib language
Carib, also known as Caribe, Cariña, Galibi, Galibí, Kali'na, Kalihna, Kalinya, Galibi Carib, Maraworno and Marworno, is an Amerindian language in the Cariban language family....

 word for the latter, yuca (spelt with a single "c").
Encyclopedia
Yucca is a genus
Genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of perennial
Perennial plant
A perennial plant or simply perennial is a plant that lives for more than two years. The term is often used to differentiate a plant from shorter lived annuals and biennials. The term is sometimes misused by commercial gardeners or horticulturalists to describe only herbaceous perennials...

 shrub
Shrub
A shrub or bush is distinguished from a tree by its multiple stems and shorter height, usually under 5–6 m tall. A large number of plants may become either shrubs or trees, depending on the growing conditions they experience...

s and tree
Tree
A tree is a perennial woody plant. It is most often defined as a woody plant that has many secondary branches supported clear of the ground on a single main stem or trunk with clear apical dominance. A minimum height specification at maturity is cited by some authors, varying from 3 m to...

s in the family
Family (biology)
In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 Asparagaceae
Asparagaceae
Asparagaceae is the botanical name of a family of flowering plants, placed in the order Asparagales of the monocots.In earlier classification systems, the species involved were often treated as belonging to the family Liliaceae...

, subfamily Agavoideae. Its 40-50 species are notable for their rosettes
Rosette (botany)
In botany, a rosette is a circular arrangement of leaves, with all the leaves at a single height.Though rosettes usually sit near the soil, their structure is an example of a modified stem.-Function:...

 of evergreen
Evergreen
In botany, an evergreen plant is a plant that has leaves in all seasons. This contrasts with deciduous plants, which completely lose their foliage during the winter or dry season.There are many different kinds of evergreen plants, both trees and shrubs...

, tough, sword-shaped leaves
Leaf
A leaf is an organ of a vascular plant, as defined in botanical terms, and in particular in plant morphology. Foliage is a mass noun that refers to leaves as a feature of plants....

 and large terminal panicle
Panicle
A panicle is a compound raceme, a loose, much-branched indeterminate inflorescence with pedicellate flowers attached along the secondary branches; in other words, a branched cluster of flowers in which the branches are racemes....

s of white or whitish flower
Flower
A flower, sometimes known as a bloom or blossom, is the reproductive structure found in flowering plants . The biological function of a flower is to effect reproduction, usually by providing a mechanism for the union of sperm with eggs...

s. They are native to the hot and dry (arid
Arid
A region is said to be arid when it is characterized by a severe lack of available water, to the extent of hindering or even preventing the growth and development of plant and animal life...

) parts of North America
North America
North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...

, Central America
Central America
Central America is the central geographic region of the Americas. It is the southernmost, isthmian portion of the North American continent, which connects with South America on the southeast. When considered part of the unified continental model, it is considered a subcontinent...

, South America
South America
South America is a continent situated in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. The continent is also considered a subcontinent of the Americas. It is bordered on the west by the Pacific Ocean and on the north and east...

, and the Caribbean
Caribbean
The Caribbean is a crescent-shaped group of islands more than 2,000 miles long separating the Gulf of Mexico and the Caribbean Sea, to the west and south, from the Atlantic Ocean, to the east and north...

. Early reports of the species were confused with the cassava
Cassava
Cassava , also called yuca or manioc, a woody shrub of the Euphorbiaceae native to South America, is extensively cultivated as an annual crop in tropical and subtropical regions for its edible starchy tuberous root, a major source of carbohydrates...

 (Manihot esculenta). Consequently, Linnaeus mistakenly derived the generic name from the Carib
Carib language
Carib, also known as Caribe, Cariña, Galibi, Galibí, Kali'na, Kalihna, Kalinya, Galibi Carib, Maraworno and Marworno, is an Amerindian language in the Cariban language family....

 word for the latter, yuca (spelt with a single "c"). It is also colloquially known in the midwest United States as "Ghosts in the graveyard", as it is commonly found growing in rural graveyards and when in bloom the flowers appear as an apparition floating.

Distribution

The natural distribution range of the genus Yucca (49 species and 24 subspecies) covers a vast area of North
North America
North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...

 and Central America
Central America
Central America is the central geographic region of the Americas. It is the southernmost, isthmian portion of the North American continent, which connects with South America on the southeast. When considered part of the unified continental model, it is considered a subcontinent...

. From Baja California
Baja California
Baja California officially Estado Libre y Soberano de Baja California is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is both the northernmost and westernmost state of Mexico. Before becoming a state in 1953, the area was known as the North...

 in the west, northwards into the southwestern United States
Southwestern United States
The Southwestern United States is a region defined in different ways by different sources. Broad definitions include nearly a quarter of the United States, including Arizona, California, Colorado, Nevada, New Mexico, Oklahoma, Texas and Utah...

, through the drier central states as far north as Alberta
Alberta
Alberta is a province of Canada. It had an estimated population of 3.7 million in 2010 making it the most populous of Canada's three prairie provinces...

 in Canada
Canada
Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

 (Yucca glauca ssp. albertana
Yucca glauca
Yucca glauca , known as soapweed yucca, narrowleaf yucca, plains yucca, and beargrass...

), and moving east along the Gulf of Mexico
Gulf of Mexico
The Gulf of Mexico is a partially landlocked ocean basin largely surrounded by the North American continent and the island of Cuba. It is bounded on the northeast, north and northwest by the Gulf Coast of the United States, on the southwest and south by Mexico, and on the southeast by Cuba. In...

, and then north again, through the Atlantic
Atlantic Ocean
The Atlantic Ocean is the second-largest of the world's oceanic divisions. With a total area of about , it covers approximately 20% of the Earth's surface and about 26% of its water surface area...

 coastal and inland neighbouring states.
To the south, the genus is represented throughout Mexico
Mexico
The United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...

 and extends into Guatemala
Guatemala
Guatemala is a country in Central America bordered by Mexico to the north and west, the Pacific Ocean to the southwest, Belize to the northeast, the Caribbean to the east, and Honduras and El Salvador to the southeast...

 (Yucca guatemalensis
Yucca guatemalensis
Yucca guatemalensis , is the tallest of the Yucca species. Common names for this species include spineless yucca, soft-tip yucca, blue-stem yucca, giant yucca and itabo. It is native to Belize, Costa Rica, El Salvador, Guatemala, Honduras and Mexico...

). Yuccas have adapted to an equally vast range of climatic and ecological conditions. They are to be found in rocky desert
Desert
A desert is a landscape or region that receives an extremely low amount of precipitation, less than enough to support growth of most plants. Most deserts have an average annual precipitation of less than...

s and badlands
Badlands
A badlands is a type of dry terrain where softer sedimentary rocks and clay-rich soils have been extensively eroded by wind and water. It can resemble malpaís, a terrain of volcanic rock. Canyons, ravines, gullies, hoodoos and other such geological forms are common in badlands. They are often...

, in prairie
Prairie
Prairies are considered part of the temperate grasslands, savannas, and shrublands biome by ecologists, based on similar temperate climates, moderate rainfall, and grasses, herbs, and shrubs, rather than trees, as the dominant vegetation type...

s and grassland
Grassland
Grasslands are areas where the vegetation is dominated by grasses and other herbaceous plants . However, sedge and rush families can also be found. Grasslands occur naturally on all continents except Antarctica...

, in mountain
Mountain
Image:Himalaya_annotated.jpg|thumb|right|The Himalayan mountain range with Mount Everestrect 58 14 160 49 Chomo Lonzorect 200 28 335 52 Makalurect 378 24 566 45 Mount Everestrect 188 581 920 656 Tibetan Plateaurect 250 406 340 427 Rong River...

ous regions, in light woodland, in coast
Coast
A coastline or seashore is the area where land meets the sea or ocean. A precise line that can be called a coastline cannot be determined due to the dynamic nature of tides. The term "coastal zone" can be used instead, which is a spatial zone where interaction of the sea and land processes occurs...

al sand
Sand
Sand is a naturally occurring granular material composed of finely divided rock and mineral particles.The composition of sand is highly variable, depending on the local rock sources and conditions, but the most common constituent of sand in inland continental settings and non-tropical coastal...

s (Yucca filamentosa
Yucca filamentosa
Yucca filamentosa, commonly known as Adam's needle, is a medicinal plant native to eastern North America.Usually trunkless, Yucca filamentosa is a multisuckering plant with heads of 30 inch long, filamentous, blue green strappy leaves. The plant is fully hardy...

), and even in subtropical
Subtropics
The subtropics are the geographical and climatical zone of the Earth immediately north and south of the tropical zone, which is bounded by the Tropic of Cancer and the Tropic of Capricorn, at latitudes 23.5°N and 23.5°S...

 and semi-temperate
Temperate
In geography, temperate or tepid latitudes of the globe lie between the tropics and the polar circles. The changes in these regions between summer and winter are generally relatively moderate, rather than extreme hot or cold...

 zones, although these are generally arid to semi-arid.

Ecology

Yuccas have a very specialized, mutualistic pollination
Pollination
Pollination is the process by which pollen is transferred in plants, thereby enabling fertilisation and sexual reproduction. Pollen grains transport the male gametes to where the female gamete are contained within the carpel; in gymnosperms the pollen is directly applied to the ovule itself...

 system, being pollinated by yucca moths (family Prodoxidae
Prodoxidae
Prodoxidae is a family of primitive monotrysian Lepidoptera. Some of these small-to-medium sized moths are day flying, like Lampronia capitella, known to European gardeners as the "Currant Shoot Borer". Others occur in Africa and Asia.Tetragma gei feeds on Mountain Avens Geum triflorum in USA....

); the insect purposefully transfers the pollen
Pollen
Pollen is a fine to coarse powder containing the microgametophytes of seed plants, which produce the male gametes . Pollen grains have a hard coat that protects the sperm cells during the process of their movement from the stamens to the pistil of flowering plants or from the male cone to the...

 from the stamen
Stamen
The stamen is the pollen producing reproductive organ of a flower...

s of one plant to the stigma
Stigma (botany)
The stigma is the receptive tip of a carpel, or of several fused carpels, in the gynoecium of a flower. The stigma receives pollen at pollination and it is on the stigma that the pollen grain germinates. The stigma is adapted to catch and trap pollen with various hairs, flaps, or sculpturings...

 of another, and at the same time lays an egg in the flower; the moth larva then feeds on some of the developing seeds, always leaving enough seed to perpetuate the species. Yucca species are the host plants for the caterpillar
Caterpillar
Caterpillars are the larval form of members of the order Lepidoptera . They are mostly herbivorous in food habit, although some species are insectivorous. Caterpillars are voracious feeders and many of them are considered to be pests in agriculture...

s of the Yucca Giant-Skipper (Megathymus yuccae
Megathymus yuccae
Megathymus yuccae, commonly known as the Yucca Giant-Skipper, is a rare early season butterfly that is widespread across the southern United States. It belongs in the family Hesperiidae, subfamily Megathyminae.-Description:...

), Ursine Giant-Skipper (Megathymus
Megathymus
Megathymus is a genus of butterflies in the skipper family, Hesperiidae.-Selected species:*Megathymus beulahae *Megathymus cofaqui *Megathymus streckeri *Megathymus texanus *Megathymus ursus...

 ursus
), and Strecker's Giant-Skipper (Megathymus streckeri).

Uses

Yuccas are widely grown as ornamental plant
Ornamental plant
Ornamental plants are plants that are grown for decorative purposes in gardens and landscape design projects, as house plants, for cut flowers and specimen display...

s in gardens. Many species of yucca also bear edible parts, including fruit
Fruit
In broad terms, a fruit is a structure of a plant that contains its seeds.The term has different meanings dependent on context. In non-technical usage, such as food preparation, fruit normally means the fleshy seed-associated structures of certain plants that are sweet and edible in the raw state,...

s, seed
Seed
A seed is a small embryonic plant enclosed in a covering called the seed coat, usually with some stored food. It is the product of the ripened ovule of gymnosperm and angiosperm plants which occurs after fertilization and some growth within the mother plant...

s, flower
Flower
A flower, sometimes known as a bloom or blossom, is the reproductive structure found in flowering plants . The biological function of a flower is to effect reproduction, usually by providing a mechanism for the union of sperm with eggs...

s, flowering stems
Plant stem
A stem is one of two main structural axes of a vascular plant. The stem is normally divided into nodes and internodes, the nodes hold buds which grow into one or more leaves, inflorescence , conifer cones, roots, other stems etc. The internodes distance one node from another...

, and more rarely root
Root
In vascular plants, the root is the organ of a plant that typically lies below the surface of the soil. This is not always the case, however, since a root can also be aerial or aerating . Furthermore, a stem normally occurring below ground is not exceptional either...

s. References to yucca root as food often stem from confusion with the similarly spelled but botanically unrelated yuca, also called cassava
Cassava
Cassava , also called yuca or manioc, a woody shrub of the Euphorbiaceae native to South America, is extensively cultivated as an annual crop in tropical and subtropical regions for its edible starchy tuberous root, a major source of carbohydrates...

 (Manihot esculenta). Roots of soaptree yucca (Yucca elata) are high in saponin
Saponin
Saponins are a class of chemical compounds, one of many secondary metabolites found in natural sources, with saponins found in particular abundance in various plant species...

s and are used as a shampoo in Native American rituals. Dried yucca leaves and trunk fibers have a low ignition temperature, making the plant desirable for use in starting fires via friction.
In rural Appalachian areas, species such as Yucca filamentosa are referred to as "meat hangers". The tough fibrous leaves with their sharp spined tips were used to puncture meat and knotted to form a loop with which to hang meat for salt curing or in smoking houses.

Cultivation

Yuccas are widely planted in the western US as a landscape plant. Most species are generally heat and cold tolerant, requiring little care and low water. They offer a dramatic accent to a landscape design.

Joshua trees (Yucca brevifolia) are protected by law in some states. A permit is needed for wild collection. As a landscape plant, they can be killed by excessive water during their summer dormant phase. For these two reasons they are avoided by landscape contractors.

Symbolism

The "yucca flower" is the state flower of New Mexico
New Mexico
New Mexico is a state located in the southwest and western regions of the United States. New Mexico is also usually considered one of the Mountain States. With a population density of 16 per square mile, New Mexico is the sixth-most sparsely inhabited U.S...

. No species name is given in the citation.

Species

Yucca aloifolia Aloe yucca, Spanish Bayonet
Yucca angustissima Narrowleaf yucca, Spanish Bayonet
Yucca brevifolia Joshua tree
Yucca baccata Banana yucca, datil
Yucca constricta Buckley's yucca
Yucca decipiens Palma China
Yucca elata Soaptree yucca
Yucca filamentosa
Yucca filamentosa
Yucca filamentosa, commonly known as Adam's needle, is a medicinal plant native to eastern North America.Usually trunkless, Yucca filamentosa is a multisuckering plant with heads of 30 inch long, filamentous, blue green strappy leaves. The plant is fully hardy...

Spoonleaf yucca, Filament yucca, or Adam's Needle
Yucca filifera Palma Chuna yucca
Yucca flaccida Flaccid leaf yucca
Yucca glauca
Yucca glauca
Yucca glauca , known as soapweed yucca, narrowleaf yucca, plains yucca, and beargrass...

Great Plains yucca
Yucca gloriosa
Yucca gloriosa
Yucca gloriosa is an evergreen shrub of the genus Yucca. Common names include Spanish Dagger, Moundlily Yucca, Soft-tipped Yucca, Spanish Bayonet or Sea Islands Yucca.- Description :...

Moundlily yucca, Adam's needle, Spanish Dagger
Yucca grandiflora Sahuiliqui yucca
Yucca guatemalensis
Yucca guatemalensis
Yucca guatemalensis , is the tallest of the Yucca species. Common names for this species include spineless yucca, soft-tip yucca, blue-stem yucca, giant yucca and itabo. It is native to Belize, Costa Rica, El Salvador, Guatemala, Honduras and Mexico...

Spineless yucca
Yucca harrimaniae Harriman's yucca
Yucca intermedia Intermediate Yucca
Yucca jaliscensis Izote
Yucca kanabensis Kanab yucca
Yucca lacandonica Tropical yucca
Yucca madrensis Soco yucca
Yucca nana Dwarf yucca
Yucca pallida
Yucca pallida
Yucca pallida, sometimes called Pale yucca, is a species of yucca native to Northern Mexico and parts of the blackland prairies of northern and central Texas, and notable for its light-colored leaves that range from a pale blue-gray to sage-green in color.The rosettes average 20-50 cm tall and...

Pale yucca
Yucca periculosa Izote
Yucca recurvifolia
Yucca recurvifolia
Yucca recurvifolia is an ornamental plant native to the southeastern United States....

Curve-leaf yucca
Yucca rigida Blue yucca
Yucca rostrata
Yucca rostrata
Yucca rostrata, also called Beaked yucca, is a tree-like plant belonging to the Yucca genus native to southern U.S. and northern Mexico....

Beaked yucca, Big Bend yucca
Yucca rupicola Texas yucca, or Twist-leaf yucca
Yucca schidigera Mojave yucca
Yucca schottii
Yucca schottii
Yucca schottii is an evergreen shrub of the genus Yucca. The common names are Schott's Yucca, Hoary Yucca, and Mountain Yucca....

Hoary yucca or Mountain yucca
Yucca standleyi
Yucca thompsoniana Thompson's Yucca
Yucca thornberi
Yucca torreyi
Yucca torreyi
Yucca torreyi is an evergreen shrub of the genus Yucca, known by the common names Spanish-dagger, Torrey's yucca, or Torrey Yucca....

Torrey yucca
Yucca treculiana Texas bayonette, Trecul's yucca
Yucca valida Datilillo
Yucca yucatana Yucatan yucca


A number of other species previously classified in Yucca are now classified in the genera Dasylirion
Dasylirion
Dasylirion is a genus of 17 species of flowering plants, all native to Mexico, with three species also extending into the southwestern United States...

, Furcraea
Furcraea
Furcraea is a genus of succulent plants belonging to the family Asparagaceae, subfamily Agavoideae, native to tropical regions of Mexico, the Caribbean, Central America and northern South America...

, Hesperaloe
Hesperaloe
Hesperaloe is a genus of flowering plants in the family Asparagaceae, subfamily Agavoideae. It contains perennial yucca-like plants with long, narrow leaves produced in a basal rosette and flowers borne on long panicles or racemes...

, Hesperoyucca
Hesperoyucca
Hesperoyucca is a small genus of three species of flowering plants closely related to, and recently split from, Yucca, which is in the family Asparagaceae, subfamily Agavoideae.-Description:...

and Nolina
Nolina
Nolina is a genus of tropical xerophytic flowering plants, with the principal distribution being in Mexico and extending into the southern United States. Some botanists have included the genus Beaucarnea in Nolina. In the APG III classification system, it is placed in the family Asparagaceae,...

.

Taxonomic arrangement

  • Section Yucca formerly Sarcocarpa Engelm.
    • Series Faxonianae Hochstätter
      • Yucca carnerosana (Trel.
        William Trelease
        William Trelease was an American botanist, entomologist, explorer, writer and educator. This botanist is denoted by the author abbreviation Trel. when citing a botanical name....

        ) McKelvey
      • Yucca faxoniana (Trel.) Sarg.
        Charles Sprague Sargent
        Charles Sprague Sargent was an American botanist. He was the first director of the Arnold Arboretum at Harvard University in Boston, Massachusetts and the standard botanical author abbreviation Sarg. is applied to plants he described.-Biography:Sargent was the second son of Henrietta and...

    • Series Baccatae Hochstätter
      • Yucca baccata Torr.
        • Yucca baccata Torr. ssp. baccata
        • Yucca baccata Torr. ssp. vespertina (McKelvey) Hochstätter
        • Yucca baccata Torr. ssp. thornberi (McKelvey) Hochstätter
      • Yucca confinis McKelvey
      • Yucca endlichiana Trel.
      • Yucca arizonica McKelvey
    • Series Treculianae Hochstätter
      • Yucca grandiflora Gentry
        Howard Scott Gentry
        Howard Scott Gentry was an American botanist recognized as the world's leading authority on the agaves.He worked for the United States Department of Agriculture, and was a research botanist with the Desert Botanical Garden in Phoenix, Arizona after 1971...

      • Yucca declinata Laferr.
      • Yucca treculiana Carriere
      • Yucca torreyi
        Yucca torreyi
        Yucca torreyi is an evergreen shrub of the genus Yucca, known by the common names Spanish-dagger, Torrey's yucca, or Torrey Yucca....

        Shafer
        John Adolph Shafer
        John Adolph Shafer was an American botanist.- Life :Born in Pittsburgh, Pennsylvania, Shafer graduated from the Pittsburgh School, of Pharmacy in 1881 and worked as a pharmacist until after his marriage to Martha Tischer in 1888.In 1897 Shafer was appointed Custodian in the Section of Botany at...

      • Yucca schidgera Roezl
        Benedikt Roezl
        Benedikt Roezl Czech traveller, gardener and botanist...

         ex Ortgies
      • Yucca schotti Engelm.
      • Yucca capensis Lenz
      • Yucca jaliscensis Trel.
      • Yucca periculosa Baker
        John Gilbert Baker
        John Gilbert Baker was an English botanist.Baker was born in Guisborough, the son of John and Mary Baker and educated at Quaker schools in Ackworth and York....

      • Yucca mixtecana Garcia-Mend.
      • Yucca decipiens Trel.
      • Yucca valida Brandegee
      • Yucca potosina Rzed.
        Jerzy Rzedowski
        Jerzy Rzedowski Rotter is a Mexican botanist. He was born in Lwów, Poland .While he was young he was made prisoner by the Germans. He remained in a concentration camp until World War II finished and he was liberated by the Allies...

      • Yucca filifera Chabaud
    • Series Gloriosae Hochstätter
      • Yucca gloriosa
        Yucca gloriosa
        Yucca gloriosa is an evergreen shrub of the genus Yucca. Common names include Spanish Dagger, Moundlily Yucca, Soft-tipped Yucca, Spanish Bayonet or Sea Islands Yucca.- Description :...

        L.
      • Yucca recurvifolia
        Yucca recurvifolia
        Yucca recurvifolia is an ornamental plant native to the southeastern United States....

        Salisb.
        Richard Anthony Salisbury
        Richard Anthony Salisbury FRS was a British botanist. While he is remembered as a valuable worker in horticultural and botanical sciences, several bitter disputes caused him to be ostracised by his contemporaries.-Life:...

    • Series Yucca
      • Yucca madrensis Gentry
      • Yucca linearifolia Clary
      • Yucca elephantipes Regel
        Eduard August von Regel
        Eduard August von Regel was a German horticulturalist and botanist. He ended his career serving as the Director of the Russian Imperial Botanical Garden of St. Petersburg...

      • Yucca lacandonica Gomez-Pompa & Valdes
      • Yucca aloifolia L.
      • Yucca yucatana Engelm.
  • Section Clistocarpa Engelm.
      • Yucca brevifolia Engelm.)
        • Yucca brevifolia Engelm. ssp. brevifolia
        • Yucca brevifolia Engelm. ssp. jaegeriana (McKelvey) Hochstätter
        • Yucca brevifolia Engelm. ssp. herbertii (Webber
          Herbert John Webber
          Herbert John Webber was an American plant physiologist who was born in Lawton, Michigan and grew up on a farm in Marshalltown, Iowa, originally wanting to be a lawyer. In 1889 he graduated from the University of Nebraska...

          ) Hochstätter
  • Section Chaenocarpa Engelm.
    • Series Filamentosae Hochstätter
      • Yucca filamentosa
        Yucca filamentosa
        Yucca filamentosa, commonly known as Adam's needle, is a medicinal plant native to eastern North America.Usually trunkless, Yucca filamentosa is a multisuckering plant with heads of 30 inch long, filamentous, blue green strappy leaves. The plant is fully hardy...

        L.
        • Yucca filamentosa L. ssp. filamentosa
        • Yucca filamentosa L. ssp. smalliana (Fernald
          Merritt Lyndon Fernald
          Merritt Lyndon Fernald was an American botanist. In his time he was regarded as the most respected scholar of the taxonomy and phytogeography of the vascular plant flora of temperate eastern North America. He published more than 850 scientific papers and wrote and edited the seventh and eighth...

          ) Hochstätter
        • Yucca filamentosa L. ssp. concava (Haw.
          Adrian Hardy Haworth
          Adrian Hardy Haworth was an English entomologist, botanist and carcinologist.He was the son of Benjamin Haworth of Haworth Hall...

          ) Hochstätter
      • Yucca flaccida Haw.
    • Series Rupicolae Hochstätter
      • Yucca cernua Keith
      • Yucca pallida
        Yucca pallida
        Yucca pallida, sometimes called Pale yucca, is a species of yucca native to Northern Mexico and parts of the blackland prairies of northern and central Texas, and notable for its light-colored leaves that range from a pale blue-gray to sage-green in color.The rosettes average 20-50 cm tall and...

        McKelvey
      • Yucca queretaroensis Pina Lujan
      • Yucca reverchonii Trel.
      • Yucca rigida (Engelm.) Trel.
      • Yucca rostrata
        Yucca rostrata
        Yucca rostrata, also called Beaked yucca, is a tree-like plant belonging to the Yucca genus native to southern U.S. and northern Mexico....

        Engelm. ex Trel.
      • Yucca rupicola Scheele
      • Yucca thompsoniana Trel.
    • Series Harrimaniae Hochstätter
      • Yucca harrimaniae Trel.
        • Yucca harrimaniae Trel. ssp. harrimaniae
        • Yucca harrimaniae Trel. ssp. neomexicana (Wooton & Standl.
          Paul Carpenter Standley
          Paul Carpenter Standley was an American botanist.Standley was born in Avalon, Missouri...

          ) Hochstätter
        • Yucca harrimaniae Trel. ssp. sterilis (Neese & Welsh) Hochstätter
        • Yucca harrimaniae Trel. ssp. gilbertiana (Trel.) Hochstätter
      • Yucca nana Hochstätter
    • Series Glaucae (McKelvey) Hochstätter
      • Yucca angustissima Engelm. ex Trel.
        • Yucca angustissima Engelm. ex Trel. ssp. angustissima
        • Yucca angustissima Engelm. ex Trel. ssp. toftiae (Welsh) Hochstätter
        • Yucca angustissima Engelm. ex Trel. ssp. kanabensis (McKelvey) Hochstätter
        • Yucca angustissima Engelm. ex Trel. ssp. avia (Reveal) Hochstätter
      • Yucca baileyi Wooton & Standl.
        • Yucca baileyi Wooton & Standl. ssp. baileyi
        • Yucca baileyi Wooton & Standl. ssp. intermedia (McKelvey) Hochstätter
      • Yucca coahuilensis Matuda & Pinja Lujan
      • Yucca elata Engelm.
        • Yucca elata Engelm. ssp. elata
        • Yucca elata Engelm. ssp. utahensis (McKelvey) Hochstätter
        • Yucca elata Engelm. ssp. verdiensis (McKelvey) Hochstätter
      • Yucca glauca
        Yucca glauca
        Yucca glauca , known as soapweed yucca, narrowleaf yucca, plains yucca, and beargrass...

        Nutt.
        Thomas Nuttall
        Thomas Nuttall was an English botanist and zoologist, who lived and worked in America from 1808 until 1841....

        • Yucca glauca Nutt. ssp. glauca
        • Yucca glauca Nutt. ssp. stricta (Sims) Hochstätter
        • Yucca glauca Nutt. ssp. albertana Hochstätter
      • Yucca campestris McKelvey
      • Yucca constricta Buckley
        Samuel Botsford Buckley
        Samuel Botsford Buckley was an American botanist, geologist, and naturalist. He graduated from Wesleyan University in 1836....

      • Yucca arkansana Trel.
        • Yucca arkansana Trel. ssp. arkansana
        • Yucca arkansana Trel. ssp. louisianensis (Trel.) Hochstätter
        • Yucca arkansana Trel. ssp. freemanni (Shinners) Hochstätter
  • Section Hesperoyucca Engelm.
    • (Treated as a separate genus Hesperoyucca
      Hesperoyucca
      Hesperoyucca is a small genus of three species of flowering plants closely related to, and recently split from, Yucca, which is in the family Asparagaceae, subfamily Agavoideae.-Description:...

      by some sources.)
      • Yucca whipplei Torr.
        • Yucca whipplei Torr. ssp. whipplei
        • Yucca whipplei Torr. ssp. caespitosa (Jones
          William Jones (philologist)
          Sir William Jones was an English philologist and scholar of ancient India, particularly known for his proposition of the existence of a relationship among Indo-European languages...

          ) Haines
        • Yucca whipplei Torr. ssp. intermedia Haines
        • Yucca whipplei Torr. ssp. percursa Haines
        • Yucca whipplei Torr. ssp. newberryi (McKelvey) Hochstätter
        • Yucca whipplei Torr. ssp. eremica Epling & Haines

Cultivars

In the years from 1897 to 1907, Carl Ludwig Sprenger
Carl Ludwig Sprenger
Carl Ludwig Sprenger was a German botanist, born on 30 November 1846 at Güstrow, Mecklenburg and died 13 December 1917 on the island of Corfu....

created and named 122 Yucca hybrids.

External links

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