1. Family: Arecaceae Bercht. & J.Presl
    1. Genus: Calamus L.
      1. Calamus optimus Becc.

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

    [PW]
    Distribution
    Known from two collections, both in Belait. Elsewhere scattered throughout Borneo, but never common. Endemic.
    General Description
    Moderately robust clustering rattan climbing to great heights, reaching 50 m or more; stem without sheaths 15 mm diam., with to 30 mm diam. internodes to 30 cm, sometimes longer in juvenile stems. Leaf sheaths dark green, armed with scattered large, convex-based, triangular, flattened, dark green, black-tipped spines and abundant caducous black scales; knee grossly swollen; ocrea small, c. 5 mm. Leaf cirrate, to 2.5 m including the cirrus to 1.5 m; petiole very short, scarcely exceeding 5 cm; leaflets up to 8 on each side of the rachis, arranged in 2’s or 3’s, large, narrow ovate or spathulate, cucullate, the largest to 85 × 11 cm, very stiff and coriaceous, somewhat plicate, dark green on the upper surface, covered in buff indumentum on the lower surface, very rarely concolorous, the margins armed with short black bristles, transverse veinlets conspicuous. Inflorescence only fragments of the female known, but probably very like that of C. caesius; rachillae to 8 cm, with close distichous bracts and c. 12 flowers on each side. Ripe fruit ovoid, c. 14 × 11 mm, tipped with a short beak to 1.5 mm and covered in 15 vertical rows of pale yellowish-brown scales. Seed to 10 × 8 mm; endosperm deeply ruminate. Seedling leaf with 2 parallel leaflets joined for much of their length. (Fig. 33, Pl. 10C).
    Vernacular
    Wi Sego (Ib.)
    [PW]
    Use
    According to Beccari, the best rattan in Borneo. The cane is similar to that of C. caesius (curiously absent from Brunei) but is generally of slightly larger diameter and is usually not so highly regarded.

    Images

    Distribution

    Calamus optimus Becc. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Apr 14, 2005 Watanabe, N.M. [NMW40], Indonesia K000209396
    Jan 31, 1992 Stockdale, M.J. [MCS90], Indonesia K000521613
    Jul 25, 1991 Ismawi [S44594], Malaysia K000521615
    Oct 19, 1990 Kutuh [KP11955], Malaysia K000521608
    Aug 20, 1987 Banyeng [S43770], Malaysia K000521609
    Feb 11, 1987 Sutsima [072], Indonesia K000521606
    Dec 19, 1985 Auggana [IDRC049], Indonesia K000521614
    Mar 16, 1982 Mogea, J.P. [1627], Indonesia K000521617
    Mar 16, 1982 Mogea, J.P. [1611], Indonesia K000521603
    May 17, 1981 Dransfield, J. [JD6064], Malaysia K000521602
    May 10, 1981 Dransfield, J. [JD6044], Malaysia K000521604
    Aug 19, 1980 Clemens, J. [27009-26755], Sabah K000207814 isotype
    Aug 19, 1980 Clemens, J. [27009-26755], Sabah K000207813 isotype
    Aug 19, 1980 Clemens, J. [27010], Sabah K000207815 isotype
    Aug 19, 1980 Dransfield, J. [JD5727], Malaysia K000521605
    Aug 19, 1980 Dransfield, J. [JD5312], Malaysia K000521616
    Aug 19, 1980 Chin [2979], Malaysia K000521607
    Aug 19, 1980 Puasa [1441], Malaysia K000521597
    Aug 19, 1980 Puasa [1441], Malaysia K000521599
    Aug 19, 1980 Keynes [s.n.1], Malaysia K000521610
    Mogea, J.P. [7427], Indonesia K000114245
    Dransfield, J. [6614], Brunei K000521611
    Wong, K.M. [524], Brunei K000521601
    Christensen [1420], Malaysia K000521612

    First published in For. Borneo: 610 (1902)

    Accepted by

    • Govaerts, R. & Dransfield, J. (2005). World Checklist of Palms: 1-223. The Board of Trustees of the Royal Botanic Gardens, Kew.
    • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne.

    Literature

    Palmweb - Palms of the World Online
    • J. Dransfield, The Rattans of Brunei Darussalam. 1997

    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