1. Family: Poaceae Barnhart
    1. Orinus Hitchc.

      1. This genus is accepted, and its native range is Central Asia to China and Himalaya.

    [GB]

    nonem

    Habit
    Perennial. Rhizomes elongated. Culms erect; 15-39.36-75 cm long. Ligule an eciliate membrane. Leaf-blades linear, or lanceolate (1); herbaceous (5), or coriaceous (1).
    Inflorescences
    Inflorescence composed of racemes. Racemes borne along a central axis; erect (3), or ascending (3), or deflexed (1); unilateral; bearing 7-9 fertile spikelets on each (1/1). Rhachis angular (4/4). Spikelet packing broadside to rhachis. Spikelets solitary. Fertile spikelets sessile (1), or pedicelled (5). Pedicels oblong (1/1).
    Spikelets
    Spikelets comprising 1 fertile florets (1), or 2 fertile florets (2), or 3-4 fertile florets (3), or 5-6 fertile florets (2), or 7-8 fertile florets (1); with diminished florets at the apex. Spikelets lanceolate (1), or oblong (2), or ovate (1), or cuneate (2); laterally compressed; 5-7.583-11 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes glabrous (4), or pubescent (2).
    Fertile
    Spikelets comprising 1 fertile florets (1), or 2 fertile florets (2), or 3-4 fertile florets (3), or 5-6 fertile florets (2), or 7-8 fertile florets (1); with diminished florets at the apex. Spikelets lanceolate (1), or oblong (2), or ovate (1), or cuneate (2); laterally compressed; 5-7.583-11 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes glabrous (4), or pubescent (2).
    Glume
    Glumes persistent; shorter than spikelet; thinner than fertile lemma. Lower glume linear (1), or lanceolate (5); 0.75-0.8333-0.9 length of upper glume; membranous; 1-keeled; 1 -veined, or 3 -veined (1). Lower glume lateral veins absent, or distinct (1). Lower glume surface glabrous, or pilose (1). Lower glume apex obtuse (1), or acute (3), or acuminate (2). Upper glume lanceolate (3), or ovate (3); 0.8-0.975-1 length of adjacent fertile lemma; membranous (5), or herbaceous (1); with undifferentiated margins (3), or hyaline margins (2), or membranous margins (1); without keels (5), or 1-keeled (1); 3 -veined. Upper glume surface smooth (5), or scabrous (1); glabrous, or pilose (1). Upper glume apex obtuse (1), or acute (3), or acuminate (2).
    Florets
    Fertile lemma lanceolate (2), or elliptic (3), or oblong (1); chartaceous; keeled; 3 -veined. Lemma midvein without distinctive roughness (5), or scaberulous (1); eciliate (4), or pubescent (2). Lemma surface glabrous (1), or pubescent (1), or pilose (2), or villous (2); hairy on back (4/5), or on veins (1/5). Lemma margins eciliate (4), or ciliate (1), or villous (1). Lemma apex entire (5), or dentate (2); 2-3 -fid (1/2); acute; muticous (5), or mucronate (2). Palea 0.8-0.9667-1.1 length of lemma; 2 -veined (5/5). Palea keels smooth (5), or scaberulous (1); eciliate (2), or pubescent (1), or ciliate (3). Palea surface glabrous (4), or pubescent (1), or pilose (1). Palea apex dentate (1/1). Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Lodicules 2 (3/3); fleshy (3/3). Anthers 3.
    Fruits
    Caryopsis with adherent pericarp; fusiform (1/4), or oblong (3/4); isodiametric (1/1); biconvex (1/1). Embryo 0.33 length of caryopsis. Hilum elliptic (1/1).
    Distribution
    Temperate Asia, or Tropical Asia (1).

    Images

    Distribution

    Native to:

    China North-Central, China South-Central, Kazakhstan, Kirgizstan, Nepal, Qinghai, Tibet, West Himalaya, Xinjiang

    Orinus Hitchc. appears in other Kew resources:

    First published in J. Washington Acad. Sci. 23: 136 (1933)

    Sources

    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 2018. 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 2018. 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