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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Lasiacis standleyi
HABIT Perennial. Culms prostrate, or rambling; 50–100 cm long; 2–4 mm diam.; rooting from lower nodes. Culm-internodes hollow; distally with pubescent line. Culm-nodes glabrous. Leaf-sheaths puberulous, or pubescent, or hirsute; outer margin hairy. Ligule an eciliate membrane; (4.5–)5–7(–9) mm long; brown; glabrous on abaxial surface; lacerate. Collar glabrous, or pubescent. Leaf-blade base asymmetrical. Leaf-blades linear, or lanceolate; 10–18 cm long; (8–)12–29(–35) mm wide. Leaf-blade surface scabrous; rough adaxially; puberulous; hairy abaxially. Leaf-blade margins entire, or undulate; scabrous. Leaf-blade apex acuminate.
INFLORESCENCE Inflorescence a panicle.
Panicle open; ovate; 7–27 cm long. Primary panicle branches ascending, or spreading; 2–15 cm long; bearing spikelets almost to the base. Panicle branches scabrous; glabrous, or pubescent; pubescent in axils.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels pubescent.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets obovate; tilted on the pedicel; dorsally compressed; 3.7–5 mm long; falling entire.
GLUMES Glumes dissimilar; reaching apex of florets; thinner than fertile lemma; shiny. Lower glume oblate; 1.7–2.5 mm long; 0.5 length of spikelet; membranous; black; without keels; 9–11 -veined. Lower glume surface woolly; hairy at apex. Lower glume apex obtuse. Upper glume ovate; 1 length of spikelet; membranous; black; without keels; 9–13 -veined. Upper glume surface woolly; hairy at apex. Upper glume apex obtuse.
FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; ovate; 1 length of spikelet; membranous; 11–13 -veined; woolly; hairy at apex; obtuse. Palea of lower sterile floret 0.25–0.33 length of lemma. Fertile lemma ovate; dorsally compressed; 3.4–4.1 mm long; 2.2–2.5 mm wide; indurate; shiny; without keel. Lemma margins involute. Lemma apex obtuse; with a shallow excavation and woolly. Palea indurate. Palea apex pubescent.
FLOWER Anthers 3; pallid. Stigmas purple.
FRUIT Caryopsis with adherent pericarp; 2.1–2.4 mm long.
DISTRIBUTION North America: Mexico. South America: Mesoamericana and western South America.
NOTES Paniceae. Davidse.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
