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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 short (3), or elongated (2). Culms 75–145.5–230 cm long. Lateral branches lacking (1/1). Ligule a ciliate membrane (1), or a fringe of hairs (4). Leaf-blades persistent, or deciduous at the ligule (2). Leaf-blade margins cartilaginous (1/1).
INFLORESCENCE Inflorescence a panicle.
Panicle open (4), or contracted (2).
Spikelets solitary, or in pairs (1). Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 3.7–6.3–10 mm long; breaking up at maturity; disarticulating below each fertile floret. Spikelet callus bearded (1/1). Floret callus bearded (4/4).
GLUMES Glumes persistent; shorter than spikelet (2), or reaching apex of florets (2), or exceeding apex of florets (2). Lower glume ovate; 0.5–0.751–0.9 length of upper glume; membranous; 1-keeled (4/4); 1 -veined. Lower glume lateral veins absent. Lower glume surface without pits. Lower glume apex acute (3), or acuminate (2). Upper glume ovate; 0.75–0.96–1.2 length of adjacent fertile lemma; membranous; 1-keeled (4/4); 1 -veined. Upper glume apex acute (3), or acuminate (2), or attenuate (1).
FLORETS Fertile lemma lanceolate (1), or obovate (4); membranous; keeled (4/4); wingless; 1 -veined. Lemma midvein eciliate (4), or pubescent (1). Lemma surface unwrinkled; without grooves; glabrous (2), or pubescent (3). Lemma apex acute (4), or attenuate (1). Palea 1.1 length of lemma; 2 -veined. Palea keels separated (1), or distant but flanking a median depression (4); eciliate (2), or pubescent (3). Palea surface glabrous (4), or pubescent (1). Palea apex dentate (1/1).
FLOWER Anthers 3 (4/4).
FRUIT Caryopsis with free soft pericarp.
DISTRIBUTION North America.
Please cite this publication as detailed in How to Cite Version: 27th January 2014.