1. Family: Poaceae Barnhart
    1. Diarrhena P.Beauv.

      1. This genus is accepted, and its native range is Russian Far East to China and Japan, SE. Canada to Central & E. U.S.A.

    [GB]

    nonem

    Habit
    Perennial. Rhizomes short (3), or elongated (2). Culms erect, or geniculately ascending (1); slender (1/1); 48-80.9-131 cm long. Lateral branches lacking (1/1). Ligule an eciliate membrane (4), or a ciliolate membrane (1). Leaf-blades linear (3), or lanceolate (4). Leaf-blade venation without cross veins (1), or with obscure cross veins (1), or with distinct cross veins (3).
    Inflorescences
    Inflorescence a panicle. Panicle open (3), or contracted (2). Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform (1/1).
    Spikelets
    Spikelets comprising 1 fertile florets (2), or 2-3 fertile florets (4), or 4-5 fertile florets (2), or 6-7 fertile florets (1); without rhachilla extension (3), or with diminished florets at the apex (2). Spikelets oblong (2), or ovate (1), or obovate (3); laterally compressed; 3-8.2-18 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes glabrous (4), or pubescent (1). Floret callus glabrous (1/1).
    Fertile
    Spikelets comprising 1 fertile florets (2), or 2-3 fertile florets (4), or 4-5 fertile florets (2), or 6-7 fertile florets (1); without rhachilla extension (3), or with diminished florets at the apex (2). Spikelets oblong (2), or ovate (1), or obovate (3); laterally compressed; 3-8.2-18 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes glabrous (4), or pubescent (1). Floret callus glabrous (1/1).
    Glume
    Glumes persistent; shorter than spikelet. Lower glume lanceolate; 0.33-0.575-0.75 length of upper glume; membranous (3), or cartilaginous (2); 1-keeled; 1 -veined, or 2-3 -veined (1). Lower glume lateral veins absent, or distinct (1). Lower glume apex acute. Upper glume lanceolate (4), or ovate (2); 0.3-0.542-0.7 length of adjacent fertile lemma; membranous (3), or cartilaginous (2); 1-keeled; 1 -veined (3), or 2 -veined (1), or 3 -veined (3), or 4-5 -veined (2). Upper glume apex acute.
    Florets
    Fertile lemma lanceolate (2), or elliptic (2), or ovate (4); chartaceous (1), or herbaceous (1), or cartilaginous (3); of similar consistency on margins (3), or much thinner on margins (2); without keel; 3 -veined, or 4-5 -veined (1). Lemma lateral veins with distinct primaries but obscure intermediates (1/2), or prominent (1/2). Lemma surface smooth (4), or scabrous (1). Lemma apex obtuse (2), or acute (1), or cuspidate (2); muticous (4), or awned (1); 1 -awned (1/1). Principal lemma awn pungent (1/1). Palea 2 -veined. Palea keels smooth (4), or scabrous (1); eciliate (4), or ciliolate (1). Palea apex dentate (1/1). Apical sterile florets resembling fertile though underdeveloped (2/2).
    Flowers
    Lodicules 2; membranous. Anthers 2 (1/4), or 3 (4/4).
    Fruits
    Caryopsis with tardily free pericarp; ellipsoid, or obovoid (4); apex umbonate.
    Distribution
    Temperate Asia (3), or North America (2).

    Images

    Distribution

    Native to:

    Alabama, Amur, Arkansas, China North-Central, China Southeast, Georgia, Illinois, Indiana, Iowa, Japan, Kansas, Kentucky, Khabarovsk, Korea, Kuril Is., Manchuria, Michigan, Minnesota, Missouri, Nebraska, New York, North Carolina, Ohio, Oklahoma, Ontario, Pennsylvania, Primorye, South Dakota, Tennessee, Texas, Virginia, West Virginia, Wisconsin

    Introduced into:

    District of Columbia, Maryland

    Diarrhena P.Beauv. appears in other Kew resources:

    First published in Ess. Agrostogr.: 142 (1812)

    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