1. Family: Poaceae Barnhart
    1. Chasmanthium Link

      1. This genus is accepted, and its native range is Central Canada, Central & E. U.S.A. to NE. Mexico.

    [GB]

    nonem

    Habit
    Perennial. Rhizomes short (4), or elongated (1). Culms erect (1/1), or geniculately ascending (1/1), or decumbent (1/1); slender (1/1); 30-88.5-150 cm long. Lateral branches lacking (2/2), or sparse (1/2). Ligule a ciliolate membrane (4), or a ciliate membrane (1). Leaf-blades linear (4), or lanceolate (1). Leaf-blade venation without cross veins (4), or with distinct cross veins (1).
    Inflorescences
    Inflorescence a panicle (4), or composed of racemes (1). Panicle open (1/4), or contracted (3/4), or glomerate (1/4). Racemes single (1/1), or borne along a central axis (1/1); spreading (1/1); bearing few fertile spikelets (1/1); bearing 2-12 fertile spikelets on each (1/1). Spikelet packing distant (1/1). Spikelets appressed (1/2), or pendulous (1/2); solitary. Fertile spikelets sessile (3), or pedicelled (3).
    Spikelets
    Spikelets comprising 0 basal sterile florets (1), or 1 basal sterile florets (4), or 2 basal sterile florets (3), or 3-4 basal sterile florets (1); 1 fertile florets (1), or 2 fertile florets (4), or 3 fertile florets (3), or 4-11 fertile florets (2), or 12-24 fertile florets (1); with diminished florets at the apex. Spikelets elliptic (1), or oblong (1), or ovate (1), or obovate (1), or cuneate (3); laterally compressed; 4-14.4-40 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose (1/1).
    Fertile
    Spikelets comprising 0 basal sterile florets (1), or 1 basal sterile florets (4), or 2 basal sterile florets (3), or 3-4 basal sterile florets (1); 1 fertile florets (1), or 2 fertile florets (4), or 3 fertile florets (3), or 4-11 fertile florets (2), or 12-24 fertile florets (1); with diminished florets at the apex. Spikelets elliptic (1), or oblong (1), or ovate (1), or obovate (1), or cuneate (3); laterally compressed; 4-14.4-40 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose (1/1).
    Glume
    Glumes persistent; shorter than spikelet. Lower glume lanceolate (2), or ovate (3); 1 length of upper glume; chartaceous (1), or herbaceous (4); 1-keeled; 1-3 -veined (1/4), or 5-6 -veined (1/4), or 7 -veined (2/4), or 8 -veined (1/4), or 9 -veined (2/4), or 10-11 -veined (1/4). Lower glume lateral veins distinct (4), or prominent (1). Lower glume apex acute (4), or acuminate (1). Upper glume lanceolate (1), or ovate (4); 0.33-0.4825-0.7 length of adjacent fertile lemma; chartaceous (1), or herbaceous (4); 1-keeled; 3 -veined (1/3), or 5-7 -veined (1/3), or 9-11 -veined (1/3). Upper glume apex acute (4), or acuminate (1).
    Florets
    Basal sterile florets male (1), or barren (4); with palea (1), or without significant palea (4). Lemma of lower sterile floret elliptic (1), or ovate (4); chartaceous (1), or herbaceous (4); 3-5 -veined (1/3), or 7-8 -veined (1/3), or 9-11 -veined (2/3); acute. Fertile lemma lanceolate (1), or ovate (4); chartaceous (1), or herbaceous (4); keeled; 7-9 -veined (2), or 11-13 -veined (3), or 14-15 -veined (1). Lemma midvein without distinctive roughness (4), or scabrous (1); eciliate (4), or ciliolate (1). Lemma apex entire, or dentate (1); 2 -fid (1/1); acute (2), or acuminate (4). Palea embraced by lemma (3), or gaping (2); 0.8-0.9333-1 length of lemma; 2 -veined. Palea keels winged; smooth (4), or scabrous (1); eciliate (4), or ciliolate (1). Palea apex dentate (1/1). Apical sterile florets resembling fertile though underdeveloped (2), or distinct from fertile (3); 1 in number (1/1); male (1/1); linear (1/1).
    Flowers
    Lodicules 2; fleshy. Anthers 1 (4/4).
    Fruits
    Caryopsis with adherent pericarp; ovoid; laterally compressed (4/4). Embryo 0.5 length of caryopsis.
    Distribution
    North America.

    Images

    Distribution

    Native to:

    Alabama, Arizona, Arkansas, Delaware, District of Columbia, Florida, Georgia, Illinois, Indiana, Kansas, Kentucky, Louisiana, Manitoba, Maryland, Mexico Northeast, Michigan, Mississippi, Missouri, Nebraska, New Jersey, New Mexico, New York, North Carolina, Ohio, Oklahoma, Pennsylvania, South Carolina, Tennessee, Texas, Virginia, West Virginia, Wisconsin

    Chasmanthium Link appears in other Kew resources:

    First published in Hort. Berol. 1: 159 (1827)

    Accepted by

    • Govaerts, R.H.A. (2011). World checklist of selected plant families published update Facilitated by the 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 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