Calamus diepenhorstii var. diepenhorstii

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Distribution

Map uses TDWG level 3 distributions (https://github.com/tdwg/wgsrpd)
Borneo present (World Checklist of Arecaceae)B
Malaya present (World Checklist of Arecaceae)B
Sumatera present (World Checklist of Arecaceae)B
Thailand present (World Checklist of Arecaceae)B
Known from two collections in Ulu Ingei. Elsewhere in Sabah (as var. major J. Dransf.), Sarawak, widespread in Peninsular Malaysia and Sumatra, in Philippines as a distinct variety. (Dransfield, J. 1997: The Rattans of Brunei Darussalam)A

Discussion

  • C. diepenhorstii var. diepenhorstii occurs in kerangas on ridge tops in the Ulu Ingei. It is a common rattan in Peninsular Malaysia, where it is used extensively (as rotan kerai), but it appears to be too rare in Brunei and elsewhere in Borneo, to be of any significance in the rattan trade. (Dransfield, J. 1997: The Rattans of Brunei Darussalam)A

Etymology

  • H. Diepenhorst, 1811-1860, Assistant Resident in W Sumatra (Dransfield, J. 1997: The Rattans of Brunei Darussalam)A

Uses

  • The cane appears to be of good quality but it is not known whether it is used. (Dransfield, J. 1997: The Rattans of Brunei Darussalam)A

Description

  • Clustering rattan climbing to 20 m; stem without sheaths to c. 15 mm diam., with sheaths to 30 mm diam., internodes to c. 15 cm. Sheaths dull, often brownish-green, drying brown, armed with long black flattened spines to 40 mm, usually less, sometimes with conspicuous swollen bases, brown scales abundant between the spines; knee conspicuous; ocrea poorly developed. Flagellum to 2 m long. Leaf ecirrate, curved, to 1.2 m long including the petiole 20-40 cm long; leaflets c. 15-30 on each side of the rachis, regularly arranged, curved, linear, the longest (in one form) to 35 × 1.4 cm, or (in another form) to 50 × 2 cm, bristly on main vein on upper surface, armed with 3 rows of bristles or densely covered with bristles on the lower surface. Inflorescence to 4 m with c. 5 very distant, partial inflorescences, long pendulous; male rachillae c. 50 × 2 mm; female rachillae c. 70 × 3 mm. Mature fruit rounded, c. 22 mm diam., briefly beaked and covered in 16-21 vertical rows of brown scales. Seed rounded; endosperm ruminate. Seedling leaf bifid. (Fig. 71). (Dransfield, J. 1997: The Rattans of Brunei Darussalam)A

Materials Examined

  • BEL: Melilas, Bt.Batu Patam, Dransfield J. 6583; Melilas, Bt.Batu Patam, Dransfield J. 6604. (Dransfield, J. 1997: The Rattans of Brunei Darussalam)A

Bibliography

    A. Dransfield, J. 1997: The Rattans of Brunei Darussalam
    B. World Checklist of Arecaceae