Calamus schistoacanthus Blume, Rumphia 3: 49 (1847)

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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 rattan restricted to lowland sites in west and central Kalimantan. (Dransfield J. and Patel M. 2005. Rattans of Borneo, an interactive key. Royal Botanic Gardens Kew.)A

Conservation

  • Endangered. (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 0.81-0.99 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; brown. Leaf sheath with abundant spines; spines persistent; horizontally pointing; of different sizes; the larger spines tapered; the longest, excluding those at the mouth of the sheath 1-3cm. Spines straight; in life black; with smooth margins; the bases swollen. Spines mostly not grouped. Spines around the leaf sheath mouth much longer than on the rest of the sheath. Ocrea - Absent. Leaf-stalk - Absent or usually less than 3cm. Leaves - Ecirrate; 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; linear; the leaflet tip acute. Longest leaflet 28.35-34.65 cm; not exceeding 2cm wide; with bristles abaxially only, (few or none above); the margins with many bristles. Bristles not interlocking; short, dark or dark-tipped up to 5mm long, or 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 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. Female rachillae not congested; with conspicuously stalked flower cups. Bracts on the rachillae not net-like.
    Fruit - At maturity 0.9-1.3 cm; ovoid; red resin (Dragon's blood) absent. Calyx in fruit split to the base and wholly flattened. Fruit scales flat, lacking a central groove; the tips not recurved; colour on ripe fruit straw-brown or yellow-brown; when dry straw-brown or yellow-brown (excluding dark margins). (Dransfield J. and Patel M. 2005. Rattans of Borneo, an interactive key. Royal Botanic Gardens Kew.)A

Notes

  • This slender species is distinctive in its rather densly armed leaf sheaths and ecirrate leaf with few rather narrow regularly arranged leaflets. (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