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

        This species is accepted, and its native range is Sumatera (Siberut).

    [PW]
    Distribution
    Endemic to Siberut Island, Mentawai Archipelago, West Sumatra.
    Biology
    Found in disturbed forest, 150 m.
    General Description
    Clustering small rattan up to 5 m tall. Stem without sheaths up to 9 mm diam., with sheaths up to 17 mm diam.; internodes up to 70 mm long; knee conspicuous, armed as the rest of sheath. Leaves to 100 cm long; leaf sheaths covered with blackish-red, detachable, very dense but patchy indumentum, spines greyish green, pointing upward, triangular in shape, up to 4.1 cm long and 2 mm wide at the base; spines around the leaf sheath mouth greenish, very dense, up to 2.7 cm long; petiole about 2 cm long, slightly concave above near the base, armed with groups of spines like those on the rachis; rachis yellowish, c. 5 mm diam., armed with groups of 2 - 4 spines abaxially, the longest spines about 8 mm, the shortest about 5 mm, adaxial surface sparsely spiny, spines in two series; leaflets subregularly arranged, 18 - 22 on each side, lanceolate, c. 21.5 x 3 cm, rarely bearing whitish hairs in pairs, mid nerve armed with blackish bristles, transverse veinlets inconspicuous; cirrus to 100 cm, armed with hooked claw-like spines, rachis and cirrus proximally also bearing single spines along the margins. Staminate inflorescence before flowering very narrowly cylindrical and elongate, up to 47 cm long, c. 7 partial inflorescences; prophyll coriaceous, obliquely truncate at the mouth; armed with very dense spines, united at the base horizontally; male flowers very small, oblong, up to 5 mm long; calyx widely ovate, 1 x 1.5 mm, with three small acute points; corolla about three times longer than calyx; stamens 6, anthers up to 0.5 mm long, filaments up to 1.5 mm long. Pistillate flower not seen. Infructescence up to 16 cm long covered by brown indumentum; prophyll persisting after anthesis; up to 3 partial infructescences, the longest to 10 cm, axis of partial infructescence brown. Fruit elongate about 2 x 1.2 cm, borne on a pedicel 3 mm long and covered in 13 vertical rows of reddish brown dragon's blood-encrusted scales; seed angular up to 10 x 8 mm; endosperm deeply ruminate, embryo basal.
    Vernacular
    Rotan Taset (Mentawai).
    Diagnostic
    ad sectionem Piptospatham pertinens; a D. dracuncula Ridl. statura maiore ad 5 m non 2 m adscendenti, petiolis brevioribus c. 2 cm non 12 cm longis, ore vaginae foliae dense spinoso non inermi, foliis spinosis spinis in rachidibus cirrisque singulariter dispositis differt.

    Distribution

    Native to:

    Sumatera

    Calamus siberutensis (Rustiami) W.J.Baker appears in other Kew resources:

    First published in Phytotaxa 197(2): 149 (2015)

    Sources

    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