Ceratolobus
Encyclopedia
Ceratolobus is a dioecious genus
of flowering plant
in the palm
family found in Southeast Asia
, commonly called rotan. They are only differentiated from close relatives like Korthalsia
, Calamus
, and Daemonorops
by leaf sheath appendages or inflorescence variations. The Greek
genus name combines "horn" and "capsule".
s they are relatively delicate and vinelike, very spiny and densely clustering, stems eventually becoming bare and covered in leaf scars. The leaves
, rachises, and petioles (when present) may be equipped with simple climbing adaptations like barbs, cirrus, and grapnel spines but the climbing habit mostly relies on stem spines, and their leaning, sprawling nature.
With the most reduced inflorescence
in the Calaminae, the large panicle remains enclosed within a tough, woody, occasionally armed bract. Nearing antithesis the beaked end develops splits, exposing the flower
s; the bract usually remains persistent, later developing another longitudinal split in fruit, or rarely falling away. Pistillate and staminate members are indistinguishable without opening the protective prophyll. The former is branched to two orders, the latter to three; male flowers are borne distant and solitary, female's are larger and develop next to similar, but distorted, sterile male flowers. The globose or egg-shaped fruit
is scaly and has one seed
.
, Sumatra
, Borneo
, Java
and the Malay peninsula
. In all cases they form dense thickets, occupying hilly or low land rain forest or in the case of C. subangulatus, in Sarawak
, heath
forest. Their low quality and spininess limits cultivation and use.
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...
family found in 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 rotan. They are only differentiated from close relatives like Korthalsia
Korthalsia
Korthalsia is a clustering genus of flowering plant in the palm family spread throughout Southeast Asia. It is a highly specialized rattan with some species known to have an intimate relationship with ants, hence the common name ant rattan. High-climbing and armed with spines, the genus is named...
, Calamus
Calamus (palm genus)
Calamus is a genus of the palm family Arecaceae. These are among several genera known as rattan palms. There are some 325 species in this genus, all with a palaeotropical distribution. They are mostly leaf-climbers with slender, reedy stems...
, and Daemonorops
Daemonorops
Daemonorops is a genus of rattan palms in the family Arecaceae found primarily in the tropics and subtropics of southeastern Asia.The stems of the Daemonorops are harvest for their cores, which is used for everything from canes to furniture. The fruits of certain species, in particular Daemonorops...
by leaf sheath appendages or inflorescence variations. The Greek
Greek language
Greek is an independent branch of the Indo-European family of languages. Native to the southern Balkans, it has the longest documented history of any Indo-European language, spanning 34 centuries of written records. Its writing system has been the Greek alphabet for the majority of its history;...
genus name combines "horn" and "capsule".
Description
Among rattanRattan
Rattan is the name for the roughly 600 species of palms in the tribe Calameae, native to tropical regions of Africa, Asia and Australasia.- Structure :...
s they are relatively delicate and vinelike, very spiny and densely clustering, stems eventually becoming bare and covered in leaf scars. The 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....
, rachises, and petioles (when present) may be equipped with simple climbing adaptations like barbs, cirrus, and grapnel spines but the climbing habit mostly relies on stem spines, and their leaning, sprawling nature.
With the most reduced 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...
in the Calaminae, the large panicle remains enclosed within a tough, woody, occasionally armed bract. Nearing antithesis the beaked end develops splits, exposing the 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; the bract usually remains persistent, later developing another longitudinal split in fruit, or rarely falling away. Pistillate and staminate members are indistinguishable without opening the protective prophyll. The former is branched to two orders, the latter to three; male flowers are borne distant and solitary, female's are larger and develop next to similar, but distorted, sterile male flowers. The globose or egg-shaped 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,...
is scaly and has 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
Not found above 1000 m, they are endemic to 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...
, 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...
, 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....
, 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 the Malay peninsula
Peninsular Malaysia
Peninsular Malaysia , also known as West Malaysia , is the part of Malaysia which lies on the Malay Peninsula. Its area is . It shares a land border with Thailand in the north. To the south is the island of Singapore. Across the Strait of Malacca to the west lies the island of Sumatra...
. In all cases they form dense thickets, occupying hilly or low land rain forest or in the case of C. subangulatus, in Sarawak
Sarawak
Sarawak is one of two Malaysian states on the island of Borneo. Known as Bumi Kenyalang , Sarawak is situated on the north-west of the island. It is the largest state in Malaysia followed by Sabah, the second largest state located to the North- East.The administrative capital is Kuching, which...
, heath
Heath (habitat)
A heath or heathland is a dwarf-shrub habitat found on mainly low quality acidic soils, characterised by open, low growing woody vegetation, often dominated by plants of the Ericaceae. There are some clear differences between heath and moorland...
forest. Their low quality and spininess limits cultivation and use.