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

        This species is accepted, and its native range is Sumatera.

    [PW]
    Distribution
    Sumatra - endemic to Birungen, Takengon, North Aceh.
    General Description
    Clustering small rattan up to 5 m tall. Stems without sheaths up to 10 mm diam., with sheaths up to 25 mm diam.; internodes up to 50 mm long. Leaf sheaths dark green, covered with black, very dense, single spines, up to 2.5 cm long, sheath surface covered with very dense black indumentum, leaf sheath mouth papery, armed as the rest of sheath, knee conspicuous, armed as the rest of sheath. Leaves up to 2 m long including petiole to 35 cm; abaxial and adaxial surfaces armed with long, erect spines to 3 cm long; rachis armed as petiole, sparsely covered with black indumentum; cirrus to 40 cm long, armed with regularly arranged groups of grapnel-like spines, blackish at the tip, proximally armed with single hook-like spines; leaflets mostly regularly arranged, slightly irregular towards the leaflet tip, 25 on each side of the rachis; leaflets lanceolate, papery, acute, 24-26 cm long, 2 cm wide, armed with scattered, reddish, short bristles along the main nerve on adaxial surface. Inflorescences pendulous to 20 cm long; peduncle to 4 cm long, armed with scattered, single spines; peduncular bracts papery, bearing scattered solitary spines, partial inflorescences 4; each bearing up to 6 rachillae; involucre pendulous, flat, just above the involucrophore, 5 mm long; involucrophore short, papery, 2 mm long. Female and male flowers unknown. Fruits rounded, c. 2.2 x 1.8 cm, covered in 12 vertical rows of scales encrusted in reddish brown dragon's blood. Seed ovoid, c. 18 x 7 mm, surface reticulate.
    Biology
    Found on steep hill slopes in relatively dry montane forest at 1800 m altitude.
    Diagnostic
    Species nova a ceteris speciebus fructibus resinosis habitu parvo, vaginis foliorum spinulis confertissimis, longis erectis armatis et cirro non nisi usque ad 40 cm longo differt.

    Distribution

    Native to:

    Sumatera

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

    First published in Phytotaxa 197(2): 141 (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