Calamus winklerianus Becc., Bot. Jahrb. Syst. 48: 91 (1912)

Primary tabs

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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
Known only from south-eastern 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

  • This is a very poorly known species that may be conspecific with Calamus pogonacanthus. (Dransfield J. and Patel M. 2005. Rattans of Borneo, an interactive key. Royal Botanic Gardens Kew.)A

Notes

  • Habit - Climbing; not branching in the forest canopy; not dying after flowering. Plants dioecious.
    Leaf-sheath - Tubular for most of its length; stem and sheath together 0.9-1.1 cm; flagellum absent; knee present; with fewer spines than the rest of the sheath. Sheath surface lacking small horizontal ridges; without hairs or minute spines; scales on surface lacking. Leaf sheath with sparse spines; spines persistent; horizontally pointing; of different sizes; the larger spines laminar; the longest, excluding those at the mouth of the sheath 1-3cm. Spines straight; with hairy 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, or much longer than 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; 11 to 39 on each side of rachis; irregularly spaced and parallel; held in a single plane; linear-lanceolate; the leaflet tip acute. Longest leaflet 32.4-39.6 cm; 2 to 5cm wide; with none or very few brsitles; the margins with bristles at tip only. Short, dark or dark-tipped up to 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 - Not rooting at its tip. Flowers arranged in two rows. 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