1. Family: Arecaceae Bercht. & J.Presl
    1. Genus: Calamus L.
      1. Calamus glaucescens (Blume) D.Dietr.

        This species is accepted, and its native range is W. Jawa.

    [PW]
    General Description
    Slender clustering rattan rarely exceeding 10 m in height, usually much less, often already flowering when 1 m tall. Stems closely clustering by short suckers, eventually forming small thickets, 5-8 mm diam. without sheaths, 8-13 mm diam. with sheaths; internodes 12-20 cm long. Leaf sheaths dull mid-green when fresh, pale brown when dry, covered with caducous flocculent, pale grey indumentum and scattered, dark, chocolate-coloured pseudoparenchymatous scales when young and densely armed with grey- brown yellowish-green-based horizontal spines, rather evenly distributed, sometimes sub-whorled, 2-20 mm long, stiff, not easily detached, generally rather broad-based, not spiculate; geniculus moderately prominent, armed as the rest of the sheath; ocrea minute, inconspicuous; spines around leaf sheath mouth rather denser and longer than those on the rest of the sheath, generally upward-pointing. Leaf 70-110 cm long including the terminal cirrus; petiole 5-12 cm long, short in plants exposed to full light, longer in shade plants, to 5 mm diam. at the base, rounded or flattened in cross-section above, armed as is the rachis with scattered, rarely paired, persistent spines 1-4 mm long, and remote solitary reflexed spines to 1 cm below, these last intergrading with short, reflexed grouped spines on the cirrus above; cirrus to 40 cm long, rarely more, the reflexed spine groups c. 1.5 cm distant below, decreasing to 0.5 cm distant above. Leaflets 6-8 on each side of the rachis ± regularly arranged, ± alternate below, subopposite above, dark green above, densely white flocculent-indumentose below, rhomboid, to 20 cm long by up to 8 cm wide at widest point, the uppermost leaflets generally much shorter, the lowermost leaflets sometimes much narrower but usually almost as long as the largest leaflets; upper 2 margins praemorse, all leaf margins bearing minute bristles; main veins 15-20 radiating from the leaflet base, transverse veinlets moderately prominent above, obscured by indumentum beneath; emerging leaf pink, rapidly turning dull brown then green. Staminate and pistillate inflorescences superficially similar, pen- dulous on a peduncle 6-15 cm long, 2-3 mm diam., armed with radiating spines 2-10 mm long, peduncle adnate to the leaf sheath above the sub- tending leaf. Prophyll pale pinky-green at first, later green, then drying to cinnamon-brown at anthesis, with scattered whitish indumentum and brown scales, 11-24 x 1.5-3.0 cm, the beak portion ± 1.5-2.5 cm long, rarely longer, unarmed except for a few reflexed spines on the margins at the very base; apical splits 1 x 1.5 mm. Axis with 4 to 6 first-order branches; first-order bracts tightly sheathing for c. 0.5 mm, long-apiculate to 4 mm. Staminate flowers solitary, creamy-yellow at anthesis, borne on an alveolus c. 0.5 mm diam., whole flower c. 5 mm long; calyx c. 1 mm high, very shallowly lobed; corolla c. 4-5 mm long, lobed ? to the base, petals c. 2 mm wide with triangular tips; stamens 6; filaments 0-7 mm high; anthers c. 2 x 0-8 mm; pistillode minute; pollen bright yellow. Pistillate flower similar to staminate, borne on an alveolus c. 1 mm diam., each with a sterile staminate flower; pistillate flower c. 5 mm long; calyx c. 1.5 mm high, with 3 lobes c. 0-5 mm high; corolla c. 4-5 x 2 mm, split in 3 petals for about 3/4 of total length; staminodal ring epipetalous, minute, with 6 tiny lobes c. 0.3 mm long; ovary c. 1.5 mm diam., rounded, tipped by 3 divergent, rugose, sinuous, fleshy stigmas c. 2 mm long. Sterile staminate flower c. 5 mm long; calyx c. 1 mm high, very shallowly lobed; corolla c. 4.5 mm, lobed ± to the base, the petals 1.5 mm wide; staminodes c. 1.5 mm long by 0.3 mm wide. Mature fruit narrowly ellipsoidal tipped with the stigmatic remains, c. 12 mm long by 5 mm diam. at the widest point, covered by 12-13 vertical rows of shiny chestnut-brown, pale-edged, reflexed scales with dark sub- marginal lines, to 2 x 1.5 mm. Seed covered with a thin sweetish sarcotesta to 0.75 mm thick; diaspore ellipsoidal, slightly pointed apically, somewhat flattened on one side, with a shallow lateral groove; endosperm homo- geneous; embryo basal. Germination adjacent-ligular; eophyll with 4-6 very faintly praemorse leaflets held in a broad horizontal fan.
    Distribution
    Extremely rare and endangered, now only known from one locality in West Java where the population consists of less than thirty clumps. In highly disturbed coastal forest on a sandbar, and on a rocky hillslope nearby. (In the past apparently more widespread).

    Images

    Distribution

    Native to:

    Jawa

    Recorded in error in:

    Thailand

    Calamus glaucescens (Blume) D.Dietr. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Sep 16, 1976 Dransfield, J. [1103], Indonesia Ceratolobus glaucescens K000525431
    Sep 16, 1976 Dransfield, J. [1140], Indonesia Ceratolobus glaucescens K000525432
    Sep 16, 1976 Blume [1043], Indonesia Ceratolobus glaucescens K000525430
    Sep 16, 1976 Kds., S.H. [44105], Indonesia Ceratolobus glaucescens K000525429

    First published in Syn. Pl. 2: 1064 (1840)

    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 Ceratolobus glaucescens.]
    • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne. [Cited as Ceratolobus glaucescens.]

    Literature

    Kew Backbone Distributions
    • Barfod, A.S. & Dransfield, J. (2013). Flora of Thailand 11(3): 323-498. The Forest Herbarium, National Park, Wildlife and Plant Conservation Department, Bangkok.

    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