Calamus hypertrichosus Becc., Ann. Roy. Bot. Gard. (Calcutta) 11(App.): 17 (1913)

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Map uses TDWG level 3 distributions (
Borneo present (World Checklist of Arecaceae)B
In Sarawak known only from Semengoh. Elsewhere known only from the type, collected last century by Teysmann in Kalimantan. Endemic to Borneo. (Dransfield, J. 1992: The Rattans of Sarawak)A


  • C. hypertrichosus was collected on a hill slope in lowland mixed dipterocarp forest. It is separated from C. javensis by the abundance of soft pale hairs on all leaflet surfaces. (Dransfield, J. 1992: The Rattans of Sarawak)A


  • Very hairy (Dransfield, J. 1992: The Rattans of Sarawak)A


  • None known. This could be a very desirable ornamental. (Dransfield, J. 1992: The Rattans of Sarawak)A


  • Very slender clustering rattan climbing to 3 m only; stem without sheaths 3 -4 mm diam., with sheaths to 6 mm diam., internodes c. 12 cm long. Sheaths dull greenish-brown, unarmed; knee present, rather small; ocrea short, tubular, ± truncate, membranous. Flagellum to 30 cm. Leaf ecirrate to 40 cm; petiole very short or absent; rachis covered in dark brown hairs; leaflets c. 7 on each side of the rachis, rather broad lanceolate with 3 conspicuous veins, the terminal leaflet pair joined for about 21 3 their length, the others ± regular, alternate, the mid leaflets c. 14 x 2.5 cm, the basalmost much shorter and swept back across the stem, all leaflet surfaces densely covered by soft pale hairs, the margins appearing ciliate. Other parts not known (Fig. 76). (Dransfield, J. 1992: The Rattans of Sarawak)A


    A. Dransfield, J. 1992: The Rattans of Sarawak
    B. World Checklist of Arecaceae