1. Family: Arecaceae Bercht. & J.Presl
    1. Genus: Calamus L.
      1. Calamus maturbongsii W.J.Baker & J.Dransf.

        This species is accepted, and its native range is NW. New Guinea.

    [PW]
    Diagnostic
    a ceteris speciebus papuanis foliis ecirratis, petiolo brevissimo, foliolis basalibus longissimis, inflorescentia flagello apicale carenti, bracteis rachidis maximis laceratis, ramis primariis congestis bene distincta
    General Description
    Moderately robust, clustering rattan climbing to 30 m. Stem with sheaths 16 – 22 mm diam., without sheaths to 10 – 11 mm diam.; internodes c. 48 cm. Leaf ecirrate, to 1 m long including petiole; sheaths with very thin, white, cobweb-like indumentum, unarmed or armed with very few, scattered, minute, easily detached, triangular spines to 1 mm; knee 13 – 22 × 16 – 21 mm, unarmed, with conspicuous ridge at the base, both ends of ridge somewhat deflexed; ocrea 3 – 5 mm, forming a low collar almost entirely encircling stem, persistent, drying woody, brittle, unarmed; flagellum to 1.7 m, with numerous grapnel spines arranged subregularly to irregularly; petiole 3 – 5 mm long, 6 – 11 × 3 – 6 mm at base, flat adaxially, rounded abaxially, unarmed; rachis with grapnel spines arranged subregularly, abaxial surface with indumentum as sheath, adaxial surface with numerous dark purple-brown scales; leaflets 7 – 12 each side of rachis, arranged regularly, lanceolate with cucullate apices, longest leaflet near leaf base 26 – 36 × 4.5 – 5 cm, the basal pair of leaflets almost as large as longest leaflets, mid-leaf leaflets 24.5 – 26 × 4.3 – 5.5 cm, apical leaflets 5.5 – 12 × 0.7 – 2 cm, apical leaflet pair not united or united to one quarter of their length, leaflets glabrous and unarmed or with exceedingly few bristles on margin or tip, transverse veinlets conspicuous. Staminate inflorescence not seen. Staminate flowers not seen. Pistillate inflorescence 62 – 81 cm long including 33 – 46 cm peduncle and 5 – 14 cm tip lacking primary branches, branched to 2 orders; prophyll 36 × 0.6 – 2 cm, with triangular limb at apex, not splitting, with indumentum as sheath, unarmed, prophyll and other primary bracts strongly overlapping; peduncular bract 1, c. 17.5 × 1.5 cm, similar to prophyll, but splitting to one half of its length, with indumentum as sheath, unarmed; rachis bracts 6 – 16.5 × 0.6 – 2 cm, similar to peduncular bract, but splitting to base and tattering due to emergence of primary branches, sometimes splitting on one side of inflorescence only, otherwise splitting irregularly, with indumentum as sheath, unarmed; primary branches 3 – 7, to 7 cm long, 3 – 6.5 cm apart, only briefly adnate to inflorescence axis above subtending bracts, straight and forming narrowly acute angle with inflorescence axis, rather congested, with up to 17 rachillae, bracts unarmed, primary branch and bracts with indumentum as rachillae; rachillae 3 – 20 × 1 mm, straight and forming acute angle with primary branch; rachilla bracts 1 × 1 mm, subdistichous, with dark indumentum and narrow brown scales; proximal floral bracteole 1 × 0.75 mm, distal floral bracteole 2 × 2 mm, triangular, scar of sterile staminate flower inconspicuous. Pistillate flowers 4.5 × 3.5 mm shortly after anthesis, available material somewhat decayed; calyx 3.5 mm diam., tubular in basal 3 mm, with 3 lobes to 0.75 × 1.5 mm, glabrous; corolla 2.75 mm, with 3 lobes; staminodes 6. Fruit subspherical to broadly ellipsoid, 15 × 12 mm including beak 0.5 mm, with 15 – 17 longitudinal rows of orange, scarcely channelled scales with finely erose margins. Seed (sarcotesta removed) 9 × 8 × 5 mm, globose, compressed, with a deep pit on one side, with a small, rounded appendage at apex; endosperm homogeneous; embryo basal.
    Conservation
    Data deficient. It should be noted that this species is known only from an active logging concession
    Biology
    Lowland forest from 100–200 m.
    Distribution
    Known only from Klasaman near Sorong in western New Guinea

    Images

    Distribution

    Native to:

    New Guinea

    Calamus maturbongsii W.J.Baker & J.Dransf. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Jan 31, 2002 Maturbongs, R.A. [286], Irian Jaya K000030003 holotype
    Jan 1, 2002 Maturbongs, R.A. [32], Indonesia K000030002

    First published in Kew Bull. 57: 725 (2002)

    Accepted by

    • Govaerts, R. (2004). World Checklist of Monocotyledons Database in ACCESS: 1-54382. The Board of Trustees of the Royal Botanic Gardens, Kew.

    Literature

    Palmweb - Palms of the World Online
    • W.J. Baker & J. Dransfield, Calamus maturbongsii, an unusual new rattan species from New Guinea. 2002

    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