Calamus nielsenii J.Dransf., Kew Bull. 35: 843 (1981)

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Map uses TDWG level 3 distributions (
Borneo present (World Checklist of Arecaceae)B
Known only from the type collection from G Mulu National Park, 4th Division. Endemic. (J. Dransfield, The Rattans of Sarawak. 1992)A


  • C. nielsenii grows in sclerophyllous ridge top vegetation on limestone at an altitude of c. 275 m above sea level. Its affinities are obscure though it may be related to C javensis. (J. Dransfield, The Rattans of Sarawak. 1992)A


  • Ivan Nielsen, Danish Botanist, collector of the type (J. Dransfield, The Rattans of Sarawak. 1992)A


  • Not known. (J. Dransfield, The Rattans of Sarawak. 1992)A


  • Slender ?clustering rattan climbing to 1 m only; stem without sheaths 4 mm diam., with sheaths to 8 mm diam., internodes to 30 mm only. Sheath dull green, armed with numerous scattered brown stiff spines, 4- 8 mm long, with bulbous bases, those around the sheath mouth longer, to 10 mm, pale buff indumentum abundant between the spines; knee inconspicuous; ocrea well developed, tubular at first, later splitting to give auricles. Flagellum not seen, but inflorescences flagellate. Leaf ecirrate to 38 cm long including the petiole c. 8 cm long; petiole armed with scattered reflexed spines to 2 mm and abundant reddish-brown hairs; leaflets acuminate, ± linear or narrow lanceolate, 1 on each side of the rachis, grouped in 2's or 3's, the longest to 18 x 1.4 cm, apical leaflets to 13 x 1 cm, joined together at the base; lower leaflet surface bearing scattered reddish-brown hairs particularly at the base, leaflet tips bristly. Inflorescence only the male known, flagellate, longer than the leaves, to 95 cm, with 5 partial inflorescences; peduncle c 35 cm, very slender, bracts tightly sheathing, inconspicuous; rachillae few, c. 35 mm long, purplish brown, bearing distichous rather lax flowers. Other parts not known (Fig. 78). (J. Dransfield, The Rattans of Sarawak. 1992)A


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