Ceratolobus subangulatus

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Ceratolobus
(sehr-ah-toh-LOH-buhs)
subangulatus
(suhb-ahn-goo-LAH-tuhs)
Cs2786483.jpg
Kuala Belalong, Brunei Darussalam (Borneo). Photo by Dr. William J. Baker, Royal Botanic Gardens, Kew/Palmweb.
Scientific Classification
Genus: Ceratolobus
(sehr-ah-toh-LOH-buhs)
Species:
subangulatus
(suhb-ahn-goo-LAH-tuhs)
Synonyms
None set.
Native Continent
Asia
Asia.gif
Morphology
Habit: Clustering
Leaf type: Pinnate
Culture
Survivability index
Common names
None.

Habitat and Distribution

Borneo, Malaya, Sumatra, and Thailand. Widespread and often common though frequently
Photo-Malaysian Biological Diversity
over-looked, in the Malay Peninsula and Borneo; rather rare in Sumatra. Found in a wide range of habitats from coastal hills at 50 m altitude to 1000 m in hill Dipterocarp forest in the mountains, but apparently absent from peat and fresh water swamp forests.

Description

Slender clustering rattan generally low to moderate in height. Stems closely clumping by short suckers, usually only 3-4 m tall but occasionally to 15 m or more (West Sumatra), 6-17 mm in diam. with sheaths, 4-7.5 mm in diam. without sheaths; internodes 10-20 cm long. Leaf sheaths dull to dark green when fresh, greeny-brown to pale reddish-brown when dry, with in- conspicuous longitudinal striations darker in colour; ocrea minute inconspicuous; sheath armature consisting of very few to moderately numerous scattered broad-based, flattened, triangular, reflexed pale-green spines, slightly swollen at the base and 3-11 mm long; chocolate-coloured and pale brown scales scattered among the spines, sometimes absent; geniculus present, slightly swollen. Leaf to 60-70 cm long including the terminal cirrus, exceptionally almost 100 cm long, sometimes very diminutive. Petiole very short or absent; rachis armed with scattered reflexed spines and scattered chocolate-coloured scales below, in robust specimens with scattered spines on upper surface of the rachis; cirrus 30-50 cm long armed with scattered groups of 3-5 reflexed thorns. Leaflets very variable in arrangement but populations usually remarkably uniform within themselves; leaflets 10-16 on each side of the rachis, pink when emerging, dark green when fully expanded, the lowermost 2-3 on each side reflexed; other leaflets usually arranged in opposite groups of 2-3, occasionally almost regular, perfectly opposite and somewhat divaricate; leaflets narrowly to broadly lanceolate, sometimes acuminate in a drip-tip, 10-25 cm long, 1.5-3 cm wide; margins and midnerve above with small bristles. Staminate and pistillate inflorescences superficially similar, erect throughout development, sessile or with a very short peduncle not exceeding 1 cm in length. Bract very variable in size, 6-20 x 2-6 cm, flat, with slightly inrolled margins, with a terminal beak up to 3 cm long, usually less, covered with chocolate- coloured scales when young, one population (in Sumatra) also covered in scattered stubby spines 2 mm high on the abaxial face, pale green when young, cinnamon-brown at anthesis. Axis about 2 mm in diam. at anthesis, usually with about 4 or 5 first-order branches; first-order bracts tightly sheathing, with triangular tips.

Culture

Cold Hardiness Zone: 11

Comments and Curiosities



External Links

References

Phonetic spelling of Latin names by edric.

Special thanks to Geoff Stein, (Palmbob) for his hundreds of photos.

Special thanks to Palmweb.org, Dr. John Dransfield, Dr. Bill Baker & team, for their volumes of information and photos.

Glossary of Palm Terms; Based on the glossary in Dransfield, J., N.W. Uhl, C.B. Asmussen-Lange, W.J. Baker, M.M. Harley & C.E. Lewis. 2008. Genera Palmarum - Evolution and Classification of the Palms. Royal Botanic Gardens, Kew. All images copyright of the artists and photographers (see images for credits).


Many Special Thanks to Ed Vaile for his long hours of tireless editing and numerous contributions.

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