1. Family: Arecaceae Bercht. & J.Presl
    1. Genus: Calamus L.
      1. Calamus geniculatus Griff.

        This species is accepted, and its native range is Peninsula Thailand to Sumatera.

    [PW]
    General Description
    Extremely variable moderate sized rattan with stem, usually solitary, apparently rather rarely clustering, to 20 m tall, usually much less, and frequently flowering when only 1 or 2 m tall. Stem without sheaths to 2 cm in diameter with internodes to 10 cm long, usually very much less, stem with sheaths to 3.5 cm. Sheaths dark shiny green with abundant grey-brown indumentum, armed with oblique almost diagonal partial whorls of reflexed flattened black spines mixed with fine spines, the longest spines to about 4 cms long, the spines joined at their bases to form a low collar which persists long after the spines have eroded away, on the old leaf sheaths; all spines covered in brown indumentum. Spines around leaf sheath mouth greatly enlarged and obliquely upward pointing, to 10 cm long and frequently paler in colour than the other leaf sheath spines. Knee only very slightly developed, bright green, ± unarmed and hence very conspicuous. Leaf very variable, often to 3 m long. Petiole to 1 m long, sometimes much less, armed below with large horizontal straw-coloured spines to 7 cm long. (These sometimes not greatly developed), armed above with scattered groups of 2-3 reflexed spines. Leaflets up to 40 on each side of the rachis, usually irregularly arranged in groups of 3-10 leaflets, sometimes ± regular, dark green, to 35 cm long by 2.0 cm wide newly emerged leaf with abundant white indumentum which quickly falls. Cirrus 40 to 100 cm long. Very variable. Inflorescence pendulous about 60 cm long with conspicuous peduncle to 40 cm armed with short lateral spines to 1.5 cm long. Bracts thin, almost papery very quickly disintegrating, armed with groups of fine almost horse-hair-like spines. Male inflorescence with densely crowded flowers; female inflorescence more lax with fewer, scattered flowers. Ripe fruit rounded, tipped with a short beak, to about 2.2 cm in diameter, covered in vertical rows of pale straw-coloured scales tinged with red fleckings. Seed rounded, somewhat flattened on one side, finely pitted. Seedling leaf with 4-6 leaflets.
    Distribution
    Kedah, Perak, Penang, Kelantan, Trengganu, Pahang, Selangor, Negri Sembilan, Malacca, Johore, Singapore. Sumatra. ? Borneo.
    Vernacular
    rotanjahaca

    Images

    Distribution

    Native to:

    Malaya, Sumatera, Thailand

    Calamus geniculatus Griff. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Griffith [s.n.], Peninsular Malaysia Daemonorops geniculata K000207618 isotype
    Saw Leng Guan [FRI44654], Malaysia Daemonorops geniculata K000208201

    First published in Calcutta J. Nat. Hist. 5: 67 (1845)

    Not accepted by

    • Barfod, A.S. & Dransfield, J. (2013). Flora of Thailand 11(3): 323-498. The Forest Herbarium, National Park, Wildlife and Plant Conservation Department, Bangkok. [Cited as Daemonorops geniculata.]
    • Govaerts, R. & Dransfield, J. (2005). World Checklist of Palms: 1-223. The Board of Trustees of the Royal Botanic Gardens, Kew. [Cited as Daemonorops geniculata.]
    • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne. [Cited as Daemonorops geniculata.]

    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