1. Family: Arecaceae Bercht. & J.Presl
    1. Genus: Calamus L.
      1. Calamus didymophyllus (Becc.) Ridl.

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

    [PW]
    General Description
    Moderate clustering rattan rarely more than 15 m tall, often fertile when only 3 m tall; stem without sheaths c. 12 mm diam., with sheaths to 30 mm diam., internodes to 15 cm long. Sheaths dark green, armed with scattered, somewhat reflexed, variable, grey to black triangular spines, 4-25 mm long with yellow bases; knee prominent. Leaf cirrate to c. 2.5 m including the petiole to 40 cm long and cirrus to 1 m long; petiole usually ± rounded in cross section, armed with sparse spines on the yellowish lower surface and rather dense groups of short spines on the dark green upper surface; leaflets to c. 20 on each side of the rachis, usually arranged in divergent opposite or alternate pairs but sometimes arranged ± regularly in the proximal portion and paired in the distal portion only, or subregularly throughout, the leaflets usually rather broad, to 35 × 3.5 cm, rarely narrow lanceolate 40 × 2 cm, bristly along the margins, otherwise unarmed. Inflorescence to 20 cm, rarely to 50 cm, with all but the first bract quickly falling at anthesis; peduncle and first bract densely armed with partial whorls of short triangular spines to 5 mm; partial inflorescences up to c. 5. often 1 or 2 only; rachillae and flowers covered in red-brown indumentum. Ripe fruit ovoid to 25 × 20 mm, covered in 12-15 vertical rows of rather swollen red-brown scales densely covered with dragon’s blood. Seed ovoid with slight flattening; endosperm deeply ruminate. Seedling leaf with 4-6 broad leaflets. (Fig. 11, Pl. 7A).
    Distribution
    Widespread throughout the lowlands of Brunei. Elsewhere throughout Borneo, Sumatra, Peninsular Malaysia and S Thailand.
    Vernacular
    Wi Jerenang (Ib.), Wi Darum (Ib.)
    [PW]
    Use
    Produces a medium quality cane; dragon’s blood formerly used.

    Images

    Distribution

    Native to:

    Borneo, Malaya, Sumatera, Thailand

    Calamus didymophyllus (Becc.) Ridl. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Sep 13, 2000 Mogea, J.P. [7402], Indonesia Daemonorops didymophylla K000114248
    Sep 13, 2000 Mogea, J.P. [7392], Indonesia Daemonorops didymophylla K000114253
    Oct 17, 1997 Afriastini, J.J. [2560], Indonesia Daemonorops didymophylla K000520415
    Sep 12, 1997 Lugas [1658], Malaysia Daemonorops didymophylla K000520437
    Apr 20, 1996 Othman [S56458], Malaysia Daemonorops didymophylla K000525247
    Apr 20, 1996 Ching, Y.P. [S56770], Malaysia Daemonorops didymophylla K000525232
    Apr 17, 1996 Dransfield, J. [RTC3], Malaysia Daemonorops didymophylla K000520411
    Apr 17, 1996 Baker, W.J. [692], Malaysia Daemonorops didymophylla K000520407
    Dec 22, 1993 Van Valkenburg [1109], Indonesia Daemonorops didymophylla K000520434
    Jan 5, 1993 Stockdale, M.J. [502], Indonesia Daemonorops didymophylla K000520435
    Oct 7, 1992 Barfod, A. [41497], Thailand Daemonorops didymophylla K000526480
    Jan 31, 1992 Stockdale, M.J. [MCS81], Indonesia Daemonorops didymophylla K000520431
    Oct 5, 1991 Van Valkenburg [1008], Indonesia Daemonorops didymophylla K000520436
    Jun 17, 1991 Giesen, W. [91], Indonesia Daemonorops didymophylla K000525233
    Apr 15, 1987 Schreckenberg, K. [KS22], Indonesia Daemonorops didymophylla K000520426
    Apr 15, 1987 Schreckenberg, K. [KS21], Indonesia Daemonorops didymophylla K000520427
    Feb 11, 1987 Fah [SAN96872], Malaysia Daemonorops didymophylla K000525238
    Dec 19, 1985 Uhaedi, S. [IDRC2], Indonesia Daemonorops didymophylla K000520428
    Aug 13, 1985 Geesink [9238], Indonesia Daemonorops didymophylla K000525241
    Dec 6, 1984 Mogea, J.P. [3679], Indonesia Daemonorops didymophylla K000525231
    Dec 6, 1984 Mogea, J.P. [4080], Indonesia Daemonorops didymophylla K000520408
    Dec 2, 1983 Mogea, J.P. [B1538], Indonesia Daemonorops didymophylla K000525243
    Aug 5, 1983 Sundaling [SAN94963], Malaysia Daemonorops didymophylla K000525237
    Aug 23, 1982 Mogea, J.P. [2575], Indonesia Daemonorops didymophylla K000520401
    Mar 2, 1982 Mogea, J.P. [1800], Indonesia Daemonorops didymophylla K000520417
    Mar 2, 1982 Mogea, J.P. [2570], Indonesia Daemonorops didymophylla K000525248
    Mar 2, 1982 Mogea, J.P. [2576], Indonesia Daemonorops didymophylla K000520406
    Apr 12, 1981 Dransfield, J. [JD5902], Malaysia Daemonorops didymophylla K000525246
    Jul 11, 1980 Dransfield, J. [JD5743], Malaysia Daemonorops didymophylla K000520412
    Jul 11, 1980 Dransfield, J. [JD5800], Malaysia Daemonorops didymophylla K000520403
    Apr 10, 1980 Abas [SAN85941], Malaysia Daemonorops didymophylla K000525240
    Mar 11, 1980 Mogea, J.P. [B1636], Indonesia Daemonorops didymophylla K000525244
    Nov 29, 1979 Mogea, J.P. [746], Indonesia Daemonorops didymophylla K000520414
    Aug 29, 1979 Dransfield, J. [JD5564], Malaysia Daemonorops didymophylla K000520422
    Aug 17, 1978 Paie [S37795], Malaysia Daemonorops didymophylla K000520413
    Mar 19, 1977 Mogea, J.P. [438], Indonesia Daemonorops didymophylla K000520425
    Aug 7, 1976 Othman [S36993], Malaysia Daemonorops didymophylla K000525235
    Jul 8, 1976 Chai, P. [S37281], Malaysia Daemonorops didymophylla K000520400
    Aug 1, 1975 Dransfield, J. [JD4643], Malaysia Daemonorops didymophylla K000520432
    Aug 1, 1975 Dransfield, J. [JD4635], Malaysia Daemonorops didymophylla K000520421
    May 19, 1975 Kostermans [915], Indonesia Daemonorops didymophylla K000520410
    May 7, 1975 Elmer, A.D.E. [20482], Malaysia Daemonorops didymophylla K000525224
    Feb 24, 1975 Lorzing [12490], Indonesia Daemonorops didymophylla K000525221
    Feb 24, 1975 Lorzing [12490], Indonesia Daemonorops didymophylla K000525222
    Feb 24, 1975 Lorzing [12490], Indonesia Daemonorops didymophylla K000525223
    Jan 6, 1975 Jacobs [5111], Malaysia Daemonorops didymophylla K000525225
    Jan 6, 1975 Jacobs [5111], Malaysia Daemonorops didymophylla K000525226
    Jan 6, 1975 Jacobs [5111], Malaysia Daemonorops didymophylla K000520405
    Aug 10, 1974 Dransfield, J. [JD4354], Indonesia Daemonorops didymophylla K000525242
    Jan 1, 1974 Toroes, R.S. [4202], Indonesia Daemonorops didymophylla K000525205
    Jan 1, 1974 Boeea [9844], Indonesia Daemonorops didymophylla K000525191
    Jan 1, 1974 Boeea [9844], Indonesia Daemonorops didymophylla K000525192
    Jan 1, 1974 Boeea [9844], Indonesia Daemonorops didymophylla K000525193
    Jan 1, 1974 Boeea [9844], Indonesia Daemonorops didymophylla K000525194
    Aug 29, 1973 Dransfield, J. [3646], Indonesia Daemonorops didymophylla K000520430
    Jul 12, 1973 Puasa [3101], Malaysia Daemonorops didymophylla K000525245
    Jul 12, 1973 Kalh [1618], Malaysia Daemonorops didymophylla K000520423
    Jun 15, 1973 Toroes, R.S. [374], Indonesia Daemonorops didymophylla K000520433
    Jun 14, 1973 Boeea [9113], Indonesia Daemonorops didymophylla K000525216
    Jun 14, 1973 Boeea [9113], Indonesia Daemonorops didymophylla K000525217
    Jun 14, 1973 Boeea [9113], Indonesia Daemonorops didymophylla K000525218
    Jun 14, 1973 Boeea [9113], Indonesia Daemonorops didymophylla K000525219
    Jun 14, 1973 Boeea [9113], Indonesia Daemonorops didymophylla K000525220
    Jun 13, 1973 Boeea [8651], Indonesia Daemonorops didymophylla K000525210
    Jun 13, 1973 Boeea [8704], Indonesia Daemonorops didymophylla K000525213
    Jun 13, 1973 Boeea [8651], Indonesia Daemonorops didymophylla K000525211
    Jun 13, 1973 Boeea [8704], Indonesia Daemonorops didymophylla K000525214
    Jun 13, 1973 Boeea [8651], Indonesia Daemonorops didymophylla K000525212
    Jun 13, 1973 Boeea [8704], Indonesia Daemonorops didymophylla K000525215
    Dec 5, 1967 Toroes, R.S. [4271], Indonesia Daemonorops didymophylla K000525199
    Dec 5, 1967 Toroes, R.S. [4271], Indonesia Daemonorops didymophylla K000525200
    Dec 5, 1967 Toroes, R.S. [4271], Indonesia Daemonorops didymophylla K000525201
    Dec 5, 1967 Toroes, R.S. [4271], Indonesia Daemonorops didymophylla K000525202
    Dec 5, 1967 Toroes, R.S. [4271], Indonesia Daemonorops didymophylla K000525203
    Dec 5, 1967 Toroes, R.S. [4271], Indonesia Daemonorops didymophylla K000525204
    Dec 3, 1967 Toroes, R.S. [4420], Indonesia Daemonorops didymophylla K000525206
    Dec 3, 1967 Toroes, R.S. [4420], Indonesia Daemonorops didymophylla K000525207
    Dec 3, 1967 Toroes, R.S. [4420], Indonesia Daemonorops didymophylla K000525208
    Dec 3, 1967 Toroes, R.S. [4420], Indonesia Daemonorops didymophylla K000525209
    Dec 3, 1967 Boeea [7671], Indonesia Daemonorops didymophylla K000525195
    Dec 3, 1967 Boeea [7671], Indonesia Daemonorops didymophylla K000525196
    Dec 3, 1967 Boeea [7671], Indonesia Daemonorops didymophylla K000525197
    Dec 3, 1967 Boeea [7671], Indonesia Daemonorops didymophylla K000525198
    Dec 2, 1935 Hewitt [s.n.], Malaysia Daemonorops didymophylla K000525227
    Dec 2, 1935 Hewitt [s.n.], Malaysia Daemonorops didymophylla K000525187
    Dec 2, 1935 Hewitt [s.n.], Malaysia Daemonorops didymophylla K000525228
    Dec 2, 1935 Hewitt [s.n.], Malaysia Daemonorops didymophylla K000525188
    Dec 2, 1935 Hewitt [s.n.], Malaysia Daemonorops didymophylla K000525229
    Dransfield, J. [J.D.3939], Indonesia Daemonorops didymophylla K000520416
    Wong, K.M. [513], Brunei Daemonorops didymophylla K000520418
    Yii, P.C. [S50321], Malaysia Daemonorops didymophylla K000525234
    Hoare, A. [255], Malaysia Daemonorops didymophylla K000114229
    Hoare, A. [100], Malaysia Daemonorops didymophylla K000114218
    Hoare, A. [98], Malaysia Daemonorops didymophylla K000114228
    Christensen [1444], Malaysia Daemonorops didymophylla K000525249
    Christensen [459], Malaysia Daemonorops didymophylla K000520438
    Forbes, H.O. [1498], Indonesia Daemonorops didymophylla K000525189
    Forbes, H.O. [1498], Indonesia Daemonorops didymophylla K000525190
    Motley [1103], Kalimantan Daemonorops didymophylla K000207672 holotype
    Barfod, A. [45255], Thailand Daemonorops didymophylla K000520409
    Motley, J. [1103], Indonesia Daemonorops didymophylla K000207671 holotype
    Motley, J. [1103], Indonesia Daemonorops didymophylla K000207673 holotype
    Soibeh [668], Malaysia Daemonorops didymophylla K000525239
    Awmack, C. [298], Indonesia Daemonorops didymophylla K000520402
    Duaneh [129], Malaysia Daemonorops didymophylla K000525230
    Sambuling [83], Malaysia Daemonorops didymophylla K000520404
    Tadong [61], Malaysia Daemonorops didymophylla K000520420
    Tungking [3], Malaysia Daemonorops didymophylla K000525236
    Leighton, M. [818] Daemonorops didymophylla K000520419
    Trichon, V. [VT799], Indonesia Daemonorops didymophylla K000520429
    Trichon, V. [VT793], Indonesia Daemonorops didymophylla K000520439

    First published in J. Straits Branch Roy. Asiat. Soc. 30: 221 (1897)

    Not accepted by

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

    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