1. Family: Poaceae Barnhart
    1. Psathyrostachys Nevski ex Roshev.

      1. This genus is accepted, and its native range is E. Europe to Siberia and N. China, Turkey to Central Asia and Pakistan.

    [GB]

    nonem

    Habit
    Perennial. Rhizomes absent (7), or short (3), or elongated (1). Culms 15-49.45-110 cm long. Leaf-sheath auricles absent (6), or falcate (6). Ligule an eciliate membrane.
    Inflorescences
    Inflorescence composed of racemes. Racemes single; linear (10), or oblong (3); bilateral. Rhachis fragile at the nodes. Spikelet packing broadside to rhachis (10/10). Rhachis internodes indefinite (1), or linear (2), or cuneate (8); falling with spikelet above (10/10). Spikelets ascending (1/1); in pairs (4), or in threes. Fertile spikelets sessile; 2 in the cluster (4), or 3 in the cluster; subequal (5/7), or the central smaller (2/7).
    Spikelets
    Spikelets comprising 1 fertile florets, or 2 fertile florets (6), or 3 fertile florets (2); without rhachilla extension (1), or with a barren rhachilla extension (9), or with diminished florets at the apex (1). Spikelets lanceolate (10), or elliptic (1); dorsally compressed; 5.5-12.18-28 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus pubescent (1/1). Rhachilla internodes brief up to lowest fertile floret (10), or elongated below proximal fertile floret (1).
    Fertile
    Spikelets comprising 1 fertile florets, or 2 fertile florets (6), or 3 fertile florets (2); without rhachilla extension (1), or with a barren rhachilla extension (9), or with diminished florets at the apex (1). Spikelets lanceolate (10), or elliptic (1); dorsally compressed; 5.5-12.18-28 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus pubescent (1/1). Rhachilla internodes brief up to lowest fertile floret (10), or elongated below proximal fertile floret (1).
    Glume
    Glumes collateral; reaching apex of florets (1), or exceeding apex of florets (10); gaping. Lower glume subulate; 1 length of upper glume. Lower glume surface smooth (5), or scabrous (6); glabrous (5), or puberulous (1), or pubescent (1), or pilose (6), or villous (1). Upper glume subulate. Upper glume surface smooth (5), or scabrous (6); glabrous (5), or puberulous (1), or pilose (6), or villous (1).
    Florets
    Fertile lemma lanceolate; coriaceous; without keel; 5 -veined (1/9), or 7 -veined (8/9). Lemma midvein without distinctive roughness (10), or scabrous (1). Lemma lateral veins prominent (1/1). Lemma surface smooth (10), or scaberulous (1), or scabrous (1); glabrous (5), or puberulous (1), or pubescent (2), or pilose (6). Lemma margins eciliate (10), or ciliolate (1). Lemma apex entire (10), or lobed (1); 2 -fid (1/1); acuminate (10/10); awned; 1 -awned. Principal lemma awn apical (10), or from a sinus (1); straight (10), or curved (1); limb glabrous (10), or ciliate (1). Palea membranous (1), or coriaceous (10). Palea keels smooth (8), or scaberulous (2), or scabrous (1). Palea surface glabrous (9), or pubescent (1), or pilose (2). Apical sterile florets 1 in number (1/1); barren (1/1); linear (1/1).
    Flowers
    Anthers 3 (1/1). Ovary unappendaged (10), or beaked (1); pubescent on apex (10/10).
    Fruits
    Caryopsis with adherent pericarp (10/10). Hilum linear (10/10); 1 length of caryopsis.
    Distribution
    Europe (1), or Temperate Asia, or South America (1).

    Images

    Distribution

    Native to:

    Afghanistan, Altay, Central European Rus, China North-Central, China Southeast, Inner Mongolia, Iran, Iraq, Irkutsk, Kazakhstan, Kirgizstan, Krasnoyarsk, Mongolia, North Caucasus, Pakistan, Qinghai, South European Russi, Tadzhikistan, Transcaucasus, Turkey, Tuva, Uzbekistan, West Siberia, Xinjiang, Yakutskiya

    Introduced into:

    Alaska, Alberta, Arizona, Bolivia, Colorado, Italy, Manitoba, Minnesota, Montana, Nebraska, New Mexico, North Dakota, Saskatchewan, South Dakota, Texas, Utah, Washington, Wyoming, Yukon

    Psathyrostachys Nevski ex Roshev. appears in other Kew resources:

    First published in V.L.Komarov (ed.), Fl. URSS 2: 712 (1934)

    Accepted by

    • Govaerts, R. (2019). World Checklist of Vascular Plants (WCVP Database) The Board of Trustees of the Royal Botanic Gardens, Kew.

    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 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