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

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

    [PW]
    Vernacular
    Hulawarra (Goari)
    Distribution
    Known from a small area between the Astrolabe Range and the Tinumu Range due east of Port Moresby
    Conservation
    Near threatened. While the forests of the Astrolabe and Tinimu Range are thought to be relatively undisturbed, C. essigii is known from an area so small and in such close proximity to the major urban centre of Port Moresby that the species faces an appreciable level of threat
    Diagnostic
    C. anomaloBurret affinis sed habitu graciliore, petiolo distincto ferenti, foliolis angustissimis linearibusque, et inflorescentia ramis paucioribus differt
    Biology
    In under storey of lower montane forest with Lithocarpus and Castanopsis between 650 and 900 m
    General Description
    Very slender, clustering, short-stemmed rattan, sometimes climbing to 8 m. Stem with sheaths 4 – 5 mm diam., without sheaths 2 – 2.5 mm diam.; internodes 4.5 – 10 cm. Leaf ecirrate 12 – 23 cm long including petiole, to 29 cm in juvenile leaves on lower stem; sheath with thin, brown, scaly indumentum, most abundant near sheath mouth, scattered brown scales in lower sheath, unarmed or armed with numerous, very fine spines to 3 mm long, most abundant in upper parts of sheath, spines most numerous near to sheath mouth, spines at sheath mouth to 5mm long, erect; knee to 7 mm long, unarmed or armed as sheath; ocrea absent or minute; petiole 1 – 3 cm, to 11 cm in juvenile leaves on lower stem, to 2 mm wide and 1.5 mm thick at base, flattened adaxially, rounded abaxially, with thin, brown indumentum, unarmed or with few solitary, reflexed, grapnel spines; rachis 8 – 55 mm, with indumentum as petiole, unarmed or armed as petiole; leaflets 3 – 5 each side of rachis, subregular or in two distinct subregular groups, narrowly linear, longest leaflet near base 12 – 21.5 × 0.5 – 0.8 cm, apical leaflets 11.5 – 21 × 0.4 – 0.6 cm, apical leaflet pair united to one tenth of their length or not at all, few minute spines on leaflet margins, most frequent towards apex, very few on adaxial surface of midrib, transverse veinlets rather inconspicuous. Flagellum to 36 cm, readily detached. Staminate inflorescence 10.5 – 17.5 cm long including 15 – 45 mm peduncle, branched to 2 orders or rarely 1 order; prophyll 40 – 80 × 3 – 5 mm, tubular if not subtending primary branch, otherwise split to base by emerging primary branches, sometimes remaining tubular distally, with indumentum as sheath, sometimes armed with few reflexed grapnel spines; peduncular bracts absent; rachis bracts 20 – 60 × 3 – 4 mm, similar to prophyll, imbricate; primary branches up to 5, to 45 mm long, 25 – 35 mm apart, straight to strongly recurving, barely adnate to primary inflorescence axis above point of insertion, bursting through base of rachis bracts, with up to 6 rachillae, sparse to abundant brown indumentum on all axes, readily detached; rachillae 2 – 15 mm × 0.3 – 1 mm, sometimes recurving; rachilla bracts 0.75 – 1 × 0.6 – 1 mm, triangular, distichous, glabrous; floral bracteole 0.8 – 1.2 × 0.5 – 0.6 mm, elliptic. Staminate flowers 4 × 2 mm prior to anthesis; calyx 1.8 – 2 mm diam., tubular in basal 1 mm, with 3 lobes to 0.5 mm long, glabrous; corolla 3.5 × 1.5 mm in bud, very briefly tubular at base, glabrous; stamens 6, filaments 2 – 3 × 0.3 – 0.5 mm, anthers 1.5 × 0.4 – 0.7 mm; pistillode minute, to 1 mm long. Pistillate inflorescence similar to staminate inflorescence, 10 – 10.5 cm long including 30 – 40 mm peduncle, branched to 1 order; prophyll 25 – 50 × 2 – 5 mm; peduncular bracts absent or 1, similar to prophyll; rachis bracts 13 – 30 × 3 – 4 mm; primary branches (=rachillae) up to 5, 4 – 20 mm × 1 – 2 mm, 15 – 30 mm apart, recurving; rachilla bracts 0.5 × 1.5 mm, subdistichous, triangular, glabrous; proximal floral bracteole 1 × 0.5 mm, distal floral bracteole 1.2 – 1.7 × 1 – 1.5 mm, glabrous, scar of sterile staminate inconspicuous. Pistillate flowers 4 × 2 mm prior to anthesis; calyx 2 mm diam., tubular in basal 3 mm, with 3 lobes to 0.75 × 1.25 mm, glabrous; corolla 3 × 2 mm, tubular in basal 0.5 mm, with 3 lobes to 2.5 × 1.5 mm, glabrous; staminodes 6, 2 mm long, staminodal ring 0.5 mm high; ovary 1.5 × 1.5 mm, spherical, style 1 mm long, stigmas 1 mm long. Fruit globose, 9.5 × 9 mm including beak to 1 mm long, with 12 – 15 longitudinal rows of smooth scales with minutely fimbriate margins. Seed somewhat immature in available material, 7 × 5.5 × 5 mm, ellipsoid, with a shallow depression on one side; endosperm homogeneous; embryo basal.

    Images

    Distribution

    Native to:

    New Guinea

    Calamus essigii W.J.Baker appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Dec 14, 2001 Larivita [LAE70623], Papua New Guinea K000030850
    Dec 14, 2001 Essig, F.B. [LAE55180], Papua New Guinea K000207883 holotype
    Dec 14, 2001 Zieck, J.F.U. [NGF36158], Papua New Guinea K000030851

    First published in Kew Bull. 57: 720 (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, Two unusual Calamus 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