Nenga
Encyclopedia
Nenga is a monoecious genus
of flowering plant
in the palm
endemic to Southeast Asia
, commonly called pinang palm. N. gajah is the aberration in the genus with its short internodes, marcescent leaves and interfoliar inflorescence, a combination of traits seen in a few species of the closely related Pinanga
and Areca
palms. The genus name is based on a corruption of a Javanese
term for a plant now classified within Pinanga.
s. A distinct crownshaft
is present in all but N. gajah, the petioles
are well developed and bear pinnate leaves
up to 2 m long. The leaflets are closely to widely spaced, regularly arranged, with one to several folds. They may be acute to acuminate, S-shaped to linear, the terminal pair usually obscurely lobed corresponding to the fold count; reaching 90 cm, they are usually deep green with a lighter underside. The rachis, petiole and crownshaft may be lightly to densely covered in hairy, brown tomentum.
The inflorescence
is branched to one order, rarely to two, erect or pendulous, and emerges below the crownshaft in all but N. gajah which emerges within the leaf crown. The fleshy male and female flower
s share the same branches, proximally arranged in triads and distally in pairs or singles. They produce an obpyriform to ovoid fruit
with a thin, fleshy mesocarp and a fibrous endocarp. Colored red, purple or black the fruit carries one seed
.
, Borneo
, Sumatra
, Java
, and Myanmar
, Nenga palms are purely tropical
found in rain forest to 1400 m. H. pumila is also found in peat swamp forest
.
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 flowering plant
Flowering plant
The flowering plants , also known as Angiospermae or Magnoliophyta, are the most diverse group of land plants. Angiosperms are seed-producing plants like the gymnosperms and can be distinguished from the gymnosperms by a series of synapomorphies...
in the palm
Arecaceae
Arecaceae or Palmae , are a family of flowering plants, the only family in the monocot order Arecales. There are roughly 202 currently known genera with around 2600 species, most of which are restricted to tropical, subtropical, and warm temperate climates...
endemic to Southeast Asia
Southeast Asia
Southeast Asia, South-East Asia, South East Asia or Southeastern Asia is a subregion of Asia, consisting of the countries that are geographically south of China, east of India, west of New Guinea and north of Australia. The region lies on the intersection of geological plates, with heavy seismic...
, commonly called pinang palm. N. gajah is the aberration in the genus with its short internodes, marcescent leaves and interfoliar inflorescence, a combination of traits seen in a few species of the closely related Pinanga
Pinanga
Pinanga is a genus of flowering plant in the Arecaceae family. The following species names have been used in the genus:-Species:*Pinanga acaulis Ridl.*Pinanga acuminata A.J.Hend.*Pinanga adangensis Ridl.*Pinanga albescens Becc....
and Areca
Areca
Areca is a genus of about 50 species of single-stemmed palms in the family Arecaceae, found in humid tropical forests from Malaysia to the Solomon Islands. The generic name Areca is derived from a name used locally on the Malabar Coast of India....
palms. The genus name is based on a corruption of a Javanese
Javanese language
Javanese language is the language of the Javanese people from the central and eastern parts of the island of Java, in Indonesia. In addition, there are also some pockets of Javanese speakers in the northern coast of western Java...
term for a plant now classified within Pinanga.
Description
Their trunks may be clustering or solitary from 5 to 15 cm wide, rarely exceeding 5 m in height. The stems are ringed by distinct leaf scars and frequently supported by stilt rootRoot
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. A distinct crownshaft
Crownshaft
An elongated circumferential leaf base formation present on some species of palm is called a crownshaft.The leaf bases of some pinnate leaved palms form a sheath at the top of the trunk surrounding the bud where all the subsequent leaves are formed.The crownshaft...
is present in all but N. gajah, the petioles
Petiole (botany)
In botany, the petiole is the stalk attaching the leaf blade to the stem. The petiole usually has the same internal structure as the stem. Outgrowths appearing on each side of the petiole are called stipules. Leaves lacking a petiole are called sessile, or clasping when they partly surround the...
are well developed and bear pinnate 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....
up to 2 m long. The leaflets are closely to widely spaced, regularly arranged, with one to several folds. They may be acute to acuminate, S-shaped to linear, the terminal pair usually obscurely lobed corresponding to the fold count; reaching 90 cm, they are usually deep green with a lighter underside. The rachis, petiole and crownshaft may be lightly to densely covered in hairy, brown tomentum.
The inflorescence
Inflorescence
An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Strictly, it is the part of the shoot of seed plants where flowers are formed and which is accordingly modified...
is branched to one order, rarely to two, erect or pendulous, and emerges below the crownshaft in all but N. gajah which emerges within the leaf crown. The fleshy male and female 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 share the same branches, proximally arranged in triads and distally in pairs or singles. They produce an obpyriform to ovoid 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,...
with a thin, fleshy mesocarp and a fibrous endocarp. Colored red, purple or black the fruit carries one 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...
.
Distribution and habitat
From peninsular Malaysia, ThailandThailand
Thailand , officially the Kingdom of Thailand , formerly known as Siam , is a country located at the centre of the Indochina peninsula and Southeast Asia. It is bordered to the north by Burma and Laos, to the east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the...
, Borneo
Borneo
Borneo is the third largest island in the world and is located north of Java Island, Indonesia, at the geographic centre of Maritime Southeast Asia....
, Sumatra
Sumatra
Sumatra is an island in western Indonesia, westernmost of the Sunda Islands. It is the largest island entirely in Indonesia , and the sixth largest island in the world at 473,481 km2 with a population of 50,365,538...
, Java
Java
Java is an island of Indonesia. With a population of 135 million , it is the world's most populous island, and one of the most densely populated regions in the world. It is home to 60% of Indonesia's population. The Indonesian capital city, Jakarta, is in west Java...
, and Myanmar
Myanmar
Burma , officially the Republic of the Union of Myanmar , is a country in Southeast Asia. Burma is bordered by China on the northeast, Laos on the east, Thailand on the southeast, Bangladesh on the west, India on the northwest, the Bay of Bengal to the southwest, and the Andaman Sea on the south....
, Nenga palms are purely tropical
Tropics
The tropics is a region of the Earth surrounding the Equator. It is limited in latitude by the Tropic of Cancer in the northern hemisphere at approximately N and the Tropic of Capricorn in the southern hemisphere at S; these latitudes correspond to the axial tilt of the Earth...
found in rain forest to 1400 m. H. pumila is also found in peat swamp forest
Peat swamp forest
Peat swamp forests are tropical moist forests where waterlogged soils prevent dead leaves and wood from fully decomposing, which over time creates a thick layer of acidic peat...
.