1. Family: Poaceae Barnhart
    1. Genus: Merostachys Spreng.
      1. Merostachys retrorsa McClure

        This species is accepted, and its native range is Venezuela to Guyana.

    [GB]
    Habit
    Perennial; caespitose. Rhizomes short; pachymorph. Culms 200-250 cm long; woody. Culm-internodes terete; distally glabrous. Lateral branches dendroid. Branch complement many; flabellate. Leaf-sheaths papillose; outer margin hairy. Leaf-sheath oral hairs setose; 5-10 mm long. Ligule a ciliolate membrane; 0.2 mm long. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.2-0.4 cm long. Leaf-blades oblong, or ovate; 10-20 cm long; 20-38 mm wide. Leaf-blade midrib indistinct. Leaf-blade venation with obscure cross veins. Leaf-blade margins scabrous. Leaf-blade apex acuminate.
    Inflorescences
    Inflorescence composed of racemes; bracteate at pedicel base. Peduncle 6-17 cm long. Racemes 1; single; unilateral; 4-8 cm long. Rhachis angular; villous on surface; terminating in a sterile spikelet. Spikelet packing broadside to rhachis; contiguous. Rhachis internodes 2-10 mm long. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1-2 mm long; ciliate.
    Sterile
    Apical sterile spikelets rudimentary.
    Spikelets
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 16-17 mm long; breaking up at maturity; disarticulating below each fertile floret. Apical sterile spikelets rudimentary.
    Fertile
    Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 16-17 mm long; breaking up at maturity; disarticulating below each fertile floret.
    Glume
    Glumes persistent; shorter than spikelet. Lower glume lanceolate; clasping; 6-7 mm long; chartaceous; 1-keeled; 0 -veined. Lower glume lateral veins absent. Lower glume surface puberulous. Lower glume margins ciliate. Lower glume apex acute. Upper glume lanceolate; 8-9 mm long; membranous; 1-keeled; 5 -veined. Upper glume surface glabrous. Upper glume margins ciliate. Upper glume apex acute; awned; 1 -awned. Upper glume awn 1 mm long.
    Florets
    Fertile lemma lanceolate; 13-14 mm long; coriaceous; shiny; without keel; rounded except near apex. Lemma surface glabrous. Lemma apex acute; mucronate. Palea 1 length of lemma. Palea surface pilose; hairy above. Rhachilla extension 1 mm long.
    Flowers
    Lodicules 3; 3-4 mm long; veined; ciliate. Anthers 3. Stigmas 2.
    Fruits
    Caryopsis with free brittle pericarp.
    Distribution
    South America: northern South America.
    Reference
    Bambuseae. McClure 2001.

    Images

    Distribution

    Native to:

    Guyana, Venezuela

    Merostachys retrorsa McClure appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Steyermark [117], Venezuela K000433175 isotype

    First published in Mem. New York Bot. Gard. 10(5): 6 (1964)

    Accepted by

    • Hokche, O., Berry, P.E. & Huber, O. (eds.) (2008). Nuevo Catálogo de la Flora Vascular de Venezuela: 1-859. Fundación Instituto Botánico de Venezuela.
    • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.
    • Boggan, J. Funck, V. & Kelloff, C. (1997). Checklist of the Plants of the Guianas (Guyana, Surinam, Franch Guiana) ed. 2: 1-238. University of Guyana, Georgetown.

    Literature

    Kew Backbone Distributions
    • Hokche, O., Berry, P.E. & Huber, O. (eds.) (2008). Nuevo Catálogo de la Flora Vascular de Venezuela: 1-859. Fundación Instituto Botánico de Venezuela.
    • Boggan, J. Funck, V. & Kelloff, C. (1997). Checklist of the Plants of the Guianas (Guyana, Surinam, Franch Guiana) ed. 2: 1-238. University of Guyana, Georgetown.

    Sources

    GrassBase - The Online World Grass Flora
    http://creativecommons.org/licenses/by-nc-sa/3.0

    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