Calamus pseudoulur Becc., Ann. Roy. Bot. Gard. (Calcutta) 11(App.): 133 (1913)

Primary tabs

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Map uses TDWG level 3 distributions (
Borneo present (World Checklist of Arecaceae)B
Known from a few collections from the 1st and 4th Divisions. Elsewhere in Kalimantan. Endemic to Borneo. (Dransfield, J. 1992: The Rattans of Sarawak)A


  • C. pseudoulur has been collected in kerangas and secondary forest at low altitudes. For differences between it and C. semoi see the latter (Dransfield, J. 1992: The Rattans of Sarawak)A


  • False ulur, resembling Calamus ulur, a species from Sumatra and Peninsular Malaysia (Dransfield, J. 1992: The Rattans of Sarawak)A

Common Name

  • wi tap ah (Ib.), wi lembah (Ib.) (Dransfield, J. 1992: The Rattans of Sarawak)A


  • A good general purpose cane for baskets and other woven objects. (Dransfield, J. 1992: The Rattans of Sarawak)A


  • Clustering moderate rattan with stems climbing to 20 m tall; stem without sheaths to 12 mm diam., with to 20 mm diam., internodes to 20 cm long. Sheaths green or greyish green, armed with rather sparse, large, scattered triangular spines to 20 x 5 mm, with conspicuous hairy margins, brown indumentum also present between the spines; knee conspicuous; ocrea poorly developed. Vestigial flagellum present, to 10 cm. Leaf to 2.4 m long including the petiole to 40 cm and cirrus to 1.2 m long; leaflets 4- c. 10 on each side of the rachis, irregularly grouped, broad lanceolate, plicate, armed with bristles only at the tips, the longest leaflets to 40 x 7 cm. Inflorescences to 90 cm long with 4-5 partial inflorescences, the whole appearing dead; bracts throughout the inflorescence splitting, expanding, tattering, dull pale or dark brown; male rachillae numerous, crowded, mostly partially hidden among the bracts, to c. 12 x 1.5 mm, ± curved; female rachillae to 25 x 4 mm, straight or curved. Mature fruit relatively large, rounded, c. 22 mm diam., shortly beaked and covered in c. 21 vertical rows of red brown scales. Seed with flesh removed ± oblate, 9 x 13 mm; sarcotesta sweet and juicy; endosperm deeply ruminate. Seedling leaf not known (Fig. 51). (Dransfield, J. 1992: The Rattans of Sarawak)A


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