1. Family: Poaceae Barnhart
    1. Willkommia Hack.

      1. This genus is accepted, and its native range is S. Tropical & S. Africa, Central U.S.A., Uruguay to NE. Argentina.

    [GB]

    nonem

    Habit
    Annual (1), or perennial (3). Stolons absent (1), or present (3). Culms decumbent (1/1); 20-40-60 cm long; firm (3), or wiry (1); rooting from lower nodes (1/1). Ligule a ciliate membrane (1), or a fringe of hairs (3). Leaf-blades stiff (1), or firm (3). Leaf-blade margins cartilaginous (2/2).
    Inflorescences
    Inflorescence composed of racemes. Racemes borne along a central axis; unilateral. Rhachis flattened (2), or angular (2). Spikelet packing adaxial; 2 -rowed (1/1). Spikelets appressed (1), or ascending (3); solitary. Fertile spikelets sessile.
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 2.5-3.962-5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus brief (1), or elongated (3); pubescent (3/3); obtuse (1), or pungent (3).
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 2.5-3.962-5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus brief (1), or elongated (3); pubescent (3/3); obtuse (1), or pungent (3).
    Glume
    Glumes lower persistent, upper deciduous; reaching apex of florets (2), or exceeding apex of florets (2); firmer than fertile lemma. Lower glume lanceolate (2), or elliptic (1), or oblong (1); 0.5-0.6625-0.75 length of upper glume; hyaline; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume apex obtuse (2), or acute (2). Upper glume elliptic; 1-1.1-1.3 length of adjacent fertile lemma; hyaline (1), or chartaceous (3); without keels; 1 -veined. Upper glume surface smooth (2), or asperulous (2). Upper glume apex obtuse (1), or acute (3).
    Florets
    Fertile lemma elliptic; membranous; without keel; 3 -veined. Lemma surface glabrous (2), or pubescent (2), or pilose (1). Lemma margins eciliate (1), or ciliate (3). Lemma apex obtuse (1), or acute (3); mucronate (1), or awned (3); 1 -awned (3/3). Palea keels eciliate (3), or ciliate (1). Palea surface glabrous (3), or pilose (1).
    Fruits
    Caryopsis with adherent pericarp; ellipsoid (1/1).
    Distribution
    Africa (3), or North America (1), or South America (1).
    [FZ]

    Gramineae, T. Cope. Flora Zambesiaca 10:2. 1999

    Inflorescences
    Inflorescence of several racemes on an elongated axis; racemes bearing inclined spikelets on a flat rhachis.
    Spikelets
    Spikelets 1-flowered without rhachilla extension, sessile, alternate in 2 rows on a tough axis, disarticulating above the glumes; glumes unequal, the inferior 0–1-nerved, the superior deciduous, 1-nerved, longer than the inferior, equalling and embracing the floret, both dorsally broadly rounded, membranous, acute; lemma almost as long as the superior glume, dorsally broadly rounded, thinly membranous, acute or shallowly emarginate at the apex, shortly awned.
    Fruits
    Caryopsis ellipsoid.

    Images

    Distribution

    Native to:

    Angola, Botswana, Caprivi Strip, Namibia, Oklahoma, Texas, Zambia, Zimbabwe

    Willkommia Hack. appears in other Kew resources:

    First published in Verh. Bot. Vereins Prov. Brandenburg 30: 145 (1888)

    Literature

    Flora Zambesiaca
    • in Verh. Bot. Vereins Prov. Brandenburg 30: 145 (1888), non Sch. Bip. ex Nyman (1879), nom. nud.

    Sources

    Flora Zambesiaca
    Flora Zambesiaca
    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 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