1. Family: Arecaceae Bercht. & J.Presl
    1. Genus: Calamus L.
      1. Calamus trachycoleus Becc.

        This species is accepted, and its native range is Borneo (Kalimantan).

    [PW]
    Conservation
    Least concern.
    General 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 1.35-1.65 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; green; scales on surface lacking. 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 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; 11 to 39 on each side of rachis; irregularly spaced and parallel; held in a single plane; lanceolate, or linear-lanceolate; the leaflet tip acute, or cucullate (hooded). Longest leaflet 27.9-34.1 cm; 2 to 5cm wide; with none or very few bristles; the margins with many bristles. Bristles not interlocking; stiff black greater than 0.5mm long. Leaflets scarcely plicate; the veins not radiating; midrib not raised and prominent. Lowermost leaflets 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; about the same length as 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; without conspicuously stalked flower cups. Bracts on the rachillae not net-like. Fruit - At maturity 1.1-1.3 cm; ellipsoid; red resin (Dragon's blood) absent; one seeded. Fruit scales with a conspicuous central groove; the tips not recurved; colour on ripe fruit greenish-white; when dry straw-brown or yellow-brown (excluding dark margins). Seed cylindrical; the surface superficially or finely pitted; endosperm ruminate.
    Distribution
    Restricted to the floodplains of large rivers in south, central and east Kalimantan, where it has been cultivated for over a hundred years.

    Images

    Distribution

    Calamus trachycoleus Becc. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Jan 24, 1974 Dransfield, J. [JD3914], Indonesia K000521395
    Heyne [s.n.], Indonesia K000207847 isotype
    Rahman [MAR1], Indonesia K000521396
    Iee [SAN129514], Malaysia K000521394

    First published in Ann. Roy. Bot. Gard. (Calcutta) 11(App.): 108 (1913)

    Accepted by

    • Govaerts, R. & Dransfield, J. (2005). World Checklist of Palms: 1-223. The Board of Trustees of the Royal Botanic Gardens, Kew.
    • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne.

    Literature

    Palmweb - Palms of the World Online
    • Dransfield J. and Patel M. 2005. Rattans of Borneo, an interactive key. Royal Botanic Gardens Kew.

    Sources

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2019. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

    Kew Names and Taxonomic Backbone
    The International Plant Names Index and World Checklist of Selected Plant Families 2019. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

    Palmweb - Palms of the World Online
    Palmweb 2011. Palmweb: Palms of the World Online. Published on the internet http://www.palmweb.org. Accessed on 21/04/2013
    Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License http://creativecommons.org/licenses/by-nc-sa/3.0