Calamus nigricans Van Valk., Blumea 40: 463 (1995)

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Distribution

Map uses TDWG level 3 distributions (http://www.nhm.ac.uk/hosted_sites/tdwg/geogrphy.html)
Borneopresent (World Checklist of Arecaceae)B
A rare rattan of lowland forest in East Kalimantan. (Dransfield J. and Patel M. 2005. Rattans of Borneo, an interactive key. Royal Botanic Gardens Kew.)A

Conservation

  • Least concern. (Dransfield J. and Patel M. 2005. Rattans of Borneo, an interactive key. Royal Botanic Gardens Kew.)A

Description

  • Habit - Climbing; stems clustering; not branching in the forest canopy; not dying after flowering. Plants dioecious.
    Leaf-sheath - Tubular for most of its length; stem and sheath together 1.08-1.32 cm; flagellum long; knee present; with spines similar to the rest of the sheath. Sheath surface lacking small horizontal ridges; without hairs or minute spines; green; with scales on surface; black. Leaf sheath with abundant spines; spines persistent; upward pointing; of more or less the same size; the larger spines laminar; the longest, excluding those at the mouth of the sheath less than 1cm. Spines straight; in life black; with hairy margins; the bases not swollen or crescent-like. Spines mostly not grouped. Spines around the leaf sheath mouth scarcely different from those on the rest of the sheath. Ocrea - Present; tattering; unarmed. Leaf-stalk - Present, usually greater than 3cm; armed; with regular not grouped spines. Large well-defined auricles absent; blotches on petiole absent. Leaves - Cirrate; rachis armed; not hairy, or with minute rigid, brown hairs. Undersurface of newly emerged leaflets same as upper surface. Scales absent from leaflet surfaces. Leaflets sessile; 11 to 39 on each side of rachis; regularly spaced and parallel; held in a single plane; linear; the leaflet tip acuminate. Longest leaflet 19.8-24.2 cm; not exceeding 2cm wide; with bristles on both faces; the margins with bristles at tip only. Short, dark or dark-tipped up to 5mm long. Leaflets scarcely plicate; the veins not radiating; midrib not raised and prominent. Lowermost leaflets not reflexed across the stem. Apical leaflets joined to 1/4; not less than 4 cm long.
    Inflorescence - Inflorescence axis long, whip-like with clawed spines on the primary bracts; not rooting at its tip; much longer than the leaves; the first bract not enclosing the inflorescences at anthesis. Partial inflorescence present; bracts at the base of the partial inflorescences wholly tubular with a neat mouth or a small open limb, much shorter than the partial inflorescence. Rachilla lacking an enclosing bract; not at all pressed against the subtending bract. Flowers arranged in two rows. Male rachillae not less than 1 cm long. Bracts on the rachillae not net-like. (Dransfield J. and Patel M. 2005. Rattans of Borneo, an interactive key. Royal Botanic Gardens Kew.)A

Notes

  • Distinct in the abundance of black indumentum covering the sheaths and spines. (Dransfield J. and Patel M. 2005. Rattans of Borneo, an interactive key. Royal Botanic Gardens Kew.)A

Bibliography

    A. Dransfield J. and Patel M. 2005. Rattans of Borneo, an interactive key. Royal Botanic Gardens Kew.
    B. World Checklist of Arecaceae