1. Family: Arecaceae Bercht. & J.Presl
    1. Genus: Calamus L.
      1. Calamus pseudoconcolor (J.Dransf.) W.J.Baker

        This species is accepted, and its native range is S. Sumatera to W. Jawa.

    General Description
    Slender clustering rattan rarely exceeding 10 m in height, usually much less, often already flowering when 1 m tall. Stems closely clustering by short suckers to 5 mm diam. without sheaths, to 10 mm with sheaths, internodes 15-22 cm long. Leaf sheaths pinky-grey-green when fresh and young, dull green when old and fresh, dull green-brown when dry, covered with caducous scurfy grey indumentum, chestnut and deep chocolate-coloured pseudoparenchymatous scales, and evenly scattered easily detached dark brown spiculate spines to 1.5 mm long, borne on slightly bulbous green bases, these last remaining long after the spiculae have become detached; geniculus prominent, armed as the rest of the sheath; juvenile sheaths espiculate, armed with pale brown spines to 1.5 cm long. Juvenile leaves with long petioles to 18 cm or more, 4 mm diam. and no cirri; adult leaves with petioles rarely exceeding 5 cm, often petiole almost absent, armed with spiculae and caducous indumentum; whole leaf to 1 m including cirrus 30-50 cm long: rachis armed with reflexed, pale-green, black-tipped spines to 2 mm long, c. 2.5 cm distant below, decreasing above, intergrading with reflexed, grouped, grapnel hooks on the cirrus where 0.5-1.5 cm distant. Leaflets 6-8 on each side of the rachis, 12-23 x 4-6 cm at the widest point, rather markedly plicate, dark green above, only slightly paler below, without dense white indumentum, rhomboid with a moderately well-defined apical portion to 3 x 0.5 cm at the base, scattered bands of caducous scales occurring on the upper surface; longest leaflets the second or third pair from the base, decreasing in size distally, ± regularly arranged, ± alternate; lower leaf margins unarmed with scattered bristles along the upper praemorse margins; main veins 15-28 radiating from the leaflet base; transverse veinlets moderately prominent above and below. Emerging leaf pink, rapidly turning dull brown then green. Inflorescences staminate and pistillate on separate plants, superficially similar, pendulous on a slender peduncle, 15-25 cm x 1 mm, the peduncle unarmed or with a row of narrow prickles 1-5 mm long, up to 10 mm distant (on either side); peduncle adnate to the sheath of the leaf above the subtending leaf. Prophyll pale pinky-green at first, later green, then drying to cinnamon-brown at anthesis with scattered whitish indumentum and dark brown scales, 12-20 x 1-2.2 cm, rather gradually tapering to the beak, up to 2.5 cm x 3 mm, unarmed; apical slits to 15 x 1 mm. Axis branching to 2 orders with up to 5 first-order branches. First-order bracts tightly sheathing to 0.5 mm high with apiculus to 4 mm or more. Staminate flowers solitary, creamy-yellow at anthesis, borne on an alveolus c. 0.5 mm diam.; calyx with lobes c. 1 mm long, triangular; corolla c. 4 mm long, split ± to the base into 3 petals c. 2 mm wide near the base, tapering to triangular tips; stamens 6; filaments c. 0.5 mm long; anthers 1.5 x 0.7 mm, canary yellow; pistillode c. 0.5 mm long, trifid. Pistillate flower borne with sterile staminate flower on an alveolus c. 1 mm diam.; calyx with 3 triangular lobes c. 5 mm long; corolla c. 4 mm long, split to I length into 3 triangular lobes; staminodes with broad tri- angular bases and subulate empty anthers to 1.2 mm long in all; ovary c. 2 mm diam., ovoid, tipped with 3 sinuous stigmas to 1.2 mm long. Sterile staminate flower c. 4 mm long; calyx 0.7 mm long, shallowly lobed; corolla c. 4 mm long, split to near the base into 3 petals each 1.2 mm wide; staminodes c. 2 x 0.25 mm. Mature fruit narrowly ellipsoidal, up to 1.4 cm long by 0-7 cm diam., covered with 12 vertical rows of chestnut-brown scales with pale edges, and tipped with remains of the stigmas. Seed covered by a thin sarcotesta, somewhat sinuous-grooved longitudinally, up to 1.2 X 0.5 cm, flattened on one side, with a narrow groove running along the length of the diaspore. Endosperm homogeneous; embryo basal. Germination adjacent-ligular; eophyll with four faintly praemorse fanned leaflets.
    a speciebus ceteris Ceratolobi foliorum vaginis spiculatis, foliolis concoloribus, fructibus anguste ellipsoideis, endospermio homogeneo distinguendus; a C. glaucescente foliolis concoloribus vaginisque spiculatis et a C. concolore fructibus anguste ellip- soideis non rotundati et endospermio homogeneo differt.
    Very local, extant in only two localities in hill forest at altitudes between 600 and 900 m in West Java and known from a third locality in the past, possibly also extant. Also known from one collection in South Sumatra. The known extant populations do not exceed 20 clumps in all and this species must be regarded as being endangered in Java.


    Native to:

    Jawa, Sumatera

    Calamus pseudoconcolor (J.Dransf.) W.J.Baker appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Nov 30, 1987 Gianno [E302], Indonesia Ceratolobus pseudoconcolor K000525433
    Sep 16, 1976 Dransfield, J. [1035], Indonesia Ceratolobus pseudoconcolor K000525434
    Dransfield, J. [4764], Indonesia Ceratolobus pseudoconcolor 49394.000
    Cultivated [1975-3398] Ceratolobus pseudoconcolor K000525476

    First published in Phytotaxa 197(2): 150 (2015)


    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.

    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
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