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  1. Family: Poaceae Barnhart
    1. Genus: Arthrostylidium Rupr.
      1. Arthrostylidium youngianum L.G.Clark & Judz.

        This species is accepted, and its native range is Colombia to Ecuador.

    [GB]
    Habit
    Perennial; caespitose. Rhizomes short; pachymorph. Culms scandent; pendulous at the tip; 1200 cm long; 5-15 mm diam.; woody. Culm-internodes terete; smooth; distally glabrous. Culm-nodes swollen (corky). Lateral branches dendroid. Bud complement 1. Branch complement several; in a clump; subtended by a bare patch above the node; with 1 branch dominant; thinner than stem. Culm-sheaths tardily deciduous; 11-26 cm long; asymmetrical at apex; ciliate on shoulders. Culm-sheath blade lanceolate; 6-12 cm long; 10-20 mm wide. Leaves 3-5 per branch. Leaf-sheaths glabrous on surface; outer margin hairy. Leaf-sheath oral hairs setose; 3-5 mm long; dark. Ligule a ciliolate membrane; 0.1-0.2 mm long. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.2-0.4 cm long. Leaf-blades lanceolate; 9-15 cm long; 13-28 mm wide. Leaf-blade surface glabrous. Leaf-blade apex acuminate.
    Inflorescences
    Inflorescence composed of racemes. Racemes 1; single; straight; bilateral; 4-10 cm long; bearing few fertile spikelets; bearing 4-8 fertile spikelets on each. Rhachis 1 mm wide; glabrous on surface. Spikelet packing broadside to rhachis; lax. Spikelets appressed; solitary. Fertile spikelets sessile.
    Spikelets
    Spikelets comprising 1 basal sterile florets; 3-6 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 13-28 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2-3 mm long.
    Fertile
    Spikelets comprising 1 basal sterile florets; 3-6 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 13-28 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2-3 mm long.
    Glume
    Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 3.3-6.5 mm long; chartaceous; without keels; 3-5 -veined. Lower glume apex acute. Upper glume lanceolate; 4-8.5 mm long; without keels; 3-7 -veined. Upper glume apex acute.
    Florets
    Basal sterile florets barren; without significant palea; persisting on inflorescence. Lemma of lower sterile floret similar to fertile lemma. Fertile lemma lanceolate; 7.5-10.5 mm long; chartaceous; without keel; 7-9 -veined. Lemma apex acute. Palea surface puberulous; hairy on back. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Lodicules 3. Anthers 3; 2 mm long. Stigmas 2.
    Fruits
    Caryopsis with adherent pericarp.
    Distribution
    South America: western South America.
    Reference
    Bambuseae. Jud. & Clarke 2001.
    [CPLC]

    Bernal, R., Gradstein, S.R. & Celis, M. (eds.). 2015. Catálogo de plantas y líquenes de Colombia. Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Bogotá. http://catalogoplantasdecolombia.unal.edu.co

    Distribution
    Nativa en Colombia; Alt. 1800 - 2500 m.; Andes.
    Habit
    Trepadora
    Conservation
    No Evaluada

    Distribution

    Native to:

    Colombia, Ecuador

    Other Data

    Arthrostylidium youngianum L.G.Clark & Judz. appears in other Kew resources:

    Bibliography

    First published in Syst. Bot. 18: 98 (1993)

    Accepted by

    • Giraldo-Cañas, D. (2011). Catálogo de la familia Poaceae en Colombia Darwiniana 49: 139-247.
    • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.
    • Jørgensen, P.M. & León-Yánez, S. (eds.) (1999). Catalogue of the Vascular Plants of Ecuador Monographs in Systematic Botany from the Missouri Botanical Garden 75: i-viii, 1-1181.

    Literature

    Kew Backbone Distributions

    • Giraldo-Cañas, D. (2011). Catálogo de la familia Poaceae en Colombia Darwiniana 49: 139-247.
    • Jørgensen, P.M. & León-Yánez, S. (eds.) (1999). Catalogue of the Vascular Plants of Ecuador Monographs in Systematic Botany from the Missouri Botanical Garden 75: i-viii, 1-1181.

    Sources

    Catálogo de Plantas y Líquenes de Colombia
    http://creativecommons.org/licenses/by-nc-sa/3.0

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

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2020. 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 2020. 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