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

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

    [PW]
    Vernacular
    baea (Karimui), arompotto (Kati), kotowo (Goilala-Tapini)
    Distribution
    Apparently widespread in lowland New Guinea.
    General Description
    Slender to medium-sized, clustering rattan climbing to 50 m. Stem with sheaths (9)14-26 mm diam., without sheaths to (5)8-16 mm diam., exudate not recorded; internodes (6)14 - 38 cm. Leaf ecirrate, to 95 cm long including petiole; sheath bright to dull green, drying pale to dark reddish brown, with sparse to abundant brown indument, rarely unarmed, sheath spines usually abundant, usually rather uniform, 5 - 10 x 2 - 3.5 mm, with conspicuously swollen bases, solitary or very rarely in horizontal groups, pale brown with black tips, horizontal, very rarely erect, very rarely much longer and more slender, acicular and fragile; knee 25 - 90 x 5 - 90 mm, drying pale to mid-brown, unarmed or very rarely sparsely armed as the rest of the sheath; ocrea conspicuous, to 15 - 48 x 2.5 - 4.5 cm, erect, swollen, congenitally split on the far side of the sheath to the petiole, papery or more usually coriaceous, persistent, pale straw-coloured to mid-brown, unarmed or armed with scattered spines as the sheath, or more rarely armed with combs of bristles to 25 x 1 mm or golden spines 24 x 3 mm; flagellum present, to 3.7 m long; petiole 8- 35 cm long, 3 - 8 mm wide and 2 - 5 mm thick at the base, flattened or slightly convex adaxially, abaxially rounded, with sparse indument, and with scattered rigid unarmed, rarely the whole petiole unarmed; rachis to 70 cm long, distally sparsely armed with recurved hooks; leaflets (2)5 - 15 on each side of rachis, arranged in distant groups of 2 - 4, rarely a few solitary leaflets, linear-lanceolate to (more usually) broad lanceolate, longest leaflet often near the base, 35 - 38 x 2.5 - 4.5 cm, mid-leaf leaflets 20 - 37 x 2 - 4 cm, apical leaflets usually in a group of 2 - 6 on each side, displayed in a fan, 9 - 25(38) x 0.7 - 4(6) cm, apical pair of leaflets united for 1/3 to 3/4 their length, surfaces glabrous, lacking bristles except for very short sparse bristles to 1 mm long along the margins, transverse veinlets conspicuous, numerous, sinuous. Staminate inflorescence branched to 3 orders, to 3 m long including the peduncle 23 - 30 cm long and the flagelliform tip 6 - 72 cm long; prophyll to 24 x 1.6 cm, closely sheathing, splitting neatly at its tip, with two triangular lobes to 1.8 x 0.6 cm, covered in very sparse grey indumentum, armed with scattered short triangular spines 2 - 3 mm long, with swollen bases or unarmed; peduncular bracts absent, rachis bracts similar to prophyll but shorter, similarly indumentose, very sparsely spiny or unarmed; primary branches 7 - 9, to at least 6 - 28 cm long, c. 6 - 23 cm apart, with numerous rachillae; rachillae 8 - 45 x 1 - 1.5 mm; rachilla bracts 1.5 - 2 x 1 - 1.5 mm, distichously arranged, explanate, bearing indumentum, particularly along margins, unarmed; floral bracteole 1 x 1 - 1.5 mm, cup-shaped, with sparse indumentum. Staminate flowers (immature) 1.8 x 1.7 mm; calyx 1.7 mm diam., tubular in basal 1 mm, with 3 lobes 0.3 x 1.1 mm, becoming glabrous; corolla 1.5 x 1 mm in bud, tubular in basal 0.1 mm; stamens 6, filaments 0.9 x 0.1 mm, anthers 0.7 x 0.15 mm; pistillode columnar, 0.91 x 0.1 mm. Pistillate inflorescence similar to staminate inflorescence, 0.6 - 1.6 m long including 25 - 35 x 1 cm peduncle and c. 19 cm flagelliform tip, branched to 2 orders; prophyll to 25 - 35 x 1.5 cm, tubular and closely sheathing, splitting apically to give a triangular lobe to 5 x 2 cm, bearing sparse dull brown indumentum and sparse reflexed spines to 2 x 1 mm with swollen bases; peduncular bract absent (always?), rachis bracts to 8 - 18 x 0.5 - 1.4 cm, closely tubular, splitting apically, armed and indumentose as the prophyll; primary branches to 10, to 30 cm long, to 10- 18 cm apart, with up to 18 rachillae; rachillae 30 - 200 x (1.5)2 - 3 mm; rachilla bracts 3 x 2.5 mm, distichously arranged, striate, with a low triangular tip, unarmed, somewhat explanate on drying, with sparse brown indumentum; proximal floral bracteoles 1 mm high, c. 4 mm diam., striate, distal floral bracteoles 2 x 2 mm, scar from sterile staminate c. 0.5 mm diam. Pistillate flowers + at anthesis 4 x 2.5 mm, borne in pairs, together with a single sterile staminate flower to give a triad; calyx tubular in basal 2.5 mm, with lobes 1.5 x 2 mm, striate, glabrous; petals 3 x 1 mm, joined in basal 1.5 mm, striate; perianths splitting and becoming explanate at fruit maturity, star-like; staminodal ring with 6 triangular teeth to 0.75 x 0.5 mm; ovary 1.5 x 1.5 mm, stigmas reflexed. Sterile staminate flower + at anthesis 2 x 1.5 mm; sepals 2 x 1 mm, joined in basal 1 mm; petals 1.5 x 1 mm, striate; sterile stamens c. 1 mm long. Fruit spherical, 10 - 11.5 x 10- 11.5 mm, including beak to 1.5 x 1.5 mm, with 14- 17 vertical rows of pale yellowish brown, channelled scales with dark margins. Seed to 6- 8 x 5 - 7 x 4- 5 mm (sarcotesta removed), irregularly ridged and with a deep pit on the chalazal side; endosperm homogeneous; embryo basal.
    Conservation
    Least concern.
    Biology
    In lowland and upland forest, including swamp forest, at altitudes up to 1200 m above sea level.

    Distribution

    Native to:

    New Guinea

    Calamus macrochlamys Becc. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Feb 18, 2002 Mogea, J.P. [6306], Indonesia K000112691
    Feb 18, 2002 Dransfield, J. [JD7599], Indonesia K000030410
    Feb 18, 2002 Dransfield, J. [JD7668], Indonesia K000030405
    Feb 18, 2002 Baker, W.J. [677], Papua New Guinea K000030403
    Feb 18, 2002 Baker, W.J. [654], Papua New Guinea K000030411
    Feb 18, 2002 Baker, W.J. [817], Indonesia K000030417
    Feb 18, 2002 Baker, W.J. [818], Indonesia K000030414
    Feb 18, 2002 Baker, W.J. [1124], Papua New Guinea K000114161
    Feb 18, 2002 Baker, W.J. [WJB595], Papua New Guinea K000030408
    Feb 18, 2002 Maturbongs, R.A. [34], Indonesia K000030407
    Feb 18, 2002 Maturbongs, R.A. [114], Indonesia K000030413
    Feb 18, 2002 Maturbongs, R.A. [219], Indonesia K000030412
    Feb 18, 2002 Maturbongs, R.A. [48], Indonesia K000030415
    Feb 18, 2002 Maturbongs, R.A. [283], Indonesia K000030402
    Feb 18, 2002 Maturbongs, R.A. [43], Indonesia K000030400
    Feb 18, 2002 Zieck, J.F.U. [NGF36186], Papua New Guinea K000030401
    Feb 18, 2002 Zieck, J.F.U. [NGF36513], Papua New Guinea K000030416
    Feb 18, 2002 Zieck, J.F.U. [NGF36534], Papua New Guinea K000030409
    Feb 18, 2002 Poudyal [81], Papua New Guinea K000030406
    Jan 1, 1996 Maturbongs, R.A. [33], Indonesia K000525740

    First published in Ann. Roy. Bot. Gard. (Calcutta) 11(1): 259 (1908)

    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 & W.J. Baker, An Account of the Papuasian Species of Calamus (Arecaceae) with Paired Fruit. 2003

    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.

    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