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GrassBase - The Online World Grass Flora
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
HABIT Perennial. Rhizomes absent, or elongated. Culms 50–100 cm long. Ligule a fringe of hairs.
INFLORESCENCE Inflorescence composed of racemes.
Racemes borne along a central axis; drooping; unilateral; bearing few fertile spikelets; bearing 2–10 fertile spikelets on each. Rhachis angular. Raceme-bases filiform.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.
FERTILE SPIKELETS Spikelets comprising 6–11 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 10–18 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite. Floret callus pubescent.
GLUMES Glumes persistent; shorter than spikelet; thinner than fertile lemma. Lower glume lanceolate; membranous; without keels; 3–5 -veined. Lower glume surface without pits. Lower glume apex emarginate, or obtuse. Upper glume ovate; 0.8 length of adjacent fertile lemma; membranous; without keels; 7–9 -veined. Upper glume apex emarginate, or obtuse.
FLORETS Fertile lemma ovate; chartaceous; without keel; wingless; 7–9 -veined. Lemma surface unwrinkled; without grooves; pilose. Lemma apex emarginate, or obtuse. Palea readily splitting down midline; 0.75 length of lemma; 2 -veined. Palea keels winged; scaberulous. Apical sterile florets resembling fertile though underdeveloped.
FRUIT Caryopsis with adherent pericarp; orbicular; laterally compressed; concavo-convex; striate; apex bicornate.
DISTRIBUTION North America.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.