Calamus tapa Becc., Ann. Roy. Bot. Gard. (Calcutta) 11(App.): 128 (1913)

Primary tabs

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Distribution

Map uses TDWG level 3 distributions (http://www.nhm.ac.uk/hosted_sites/tdwg/geogrphy.html)
Borneo present (World Checklist of Arecaceae)B
A very poorly known species, known only from west Kalimantan. (Dransfield J. and Patel M. 2005. Rattans of Borneo, an interactive key. Royal Botanic Gardens Kew.)A

Conservation

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

Description

  • Habit - Climbing; not branching in the forest canopy; not dying after flowering. Plants dioecious.
    Leaf-sheath - Tubular for most of its length; flagellum long; knee present; with fewer spines than the rest of the sheath. Sheath surface lacking small horizontal ridges; without hairs or minute spines; green; scales on surface lacking. Leaf sheath with abundant spines; spines persistent; horizontally pointing; of more or less the same size; the larger spines tapered; the longest, excluding those at the mouth of the sheath less than 1cm. Spines straight; in life same colour as the leaf sheath; with smooth margins; the bases downswept and crescent-like. Spines mostly not grouped. Spines around the leaf sheath mouth scarcely different from those on the rest of the sheath. Ocrea - Absent. Leaf-stalk - Absent or usually less than 3cm. Leaves - Cirrate; rachis armed; not hairy. Undersurface of newly emerged leaflets same as upper surface. Scales absent from leaflet surfaces. Leaflets sessile; 1 to 10 on each side of rachis; regularly spaced and parallel; held in a single plane; lanceolate; the leaflet tip acute. 2 to 5cm wide; with none or very few brsitles; the margins with many bristles. Bristles not interlocking; stiff black greater than 0.5mm long. Leaflets scarcely plicate; the veins not radiating; midrib raised and prominent adaxially. Lowermost leaflets not reflexed across the stem. Apical leaflets not or scarcely joined; not less than 4 cm long.
    Inflorescence - Inflorescence axis erect along the axis, with clawed spines on the primary bracts; not rooting at its tip; much shorter 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. Female rachillae not congested; without conspicuously stalked flower cups. Bracts on the rachillae not net-like. (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