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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 linearis
HABIT Perennial; mat forming. Culms prostrate; 40–100 cm long; 2–5 mm diam.; rooting from lower nodes. Culm-internodes solid. Culm-nodes glabrous. Lateral branches ample. Leaf-sheaths puberulous, or pubescent; outer margin hairy. Ligule a ciliolate membrane; 1.8–5 mm long; brown; pubescent on abaxial surface; erose, or lacerate. Collar pubescent. Leaf-blade base asymmetrical. Leaf-blades linear, or lanceolate; 13–22 cm long; 8–15 mm wide. Leaf-blade surface glabrous, or puberulous. Leaf-blade margins scabrous. Leaf-blade apex acuminate, or attenuate.
INFLORESCENCE Inflorescence a panicle.
Panicle open; ovate; 19–30 cm long. Primary panicle branches spreading; 10–23 cm long. Panicle branches scabrous; glabrous in axils.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets obovate; tilted on the pedicel; dorsally compressed; 3.9–4.5 mm long; 2.2 mm wide; falling entire.
GLUMES Glumes dissimilar; reaching apex of florets; thinner than fertile lemma; shiny. Lower glume oblate; 2–2.5 mm long; 0.5–0.6 length of spikelet; membranous; black; without keels; 7–9 -veined. Lower glume surface woolly; hairy at apex. Lower glume apex obtuse. Upper glume ovate; 1 length of adjacent fertile lemma; membranous; black; without keels; 9–11 -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; 9–11 -veined; woolly; hairy at apex; obtuse. Palea of lower sterile floret 0.33–0.5 length of lemma. Fertile lemma ovate; dorsally compressed; 3.9–4.1 mm long; indurate; dark brown; shiny; without keel. Lemma margins involute. Lemma apex obtuse; with a shallow excavation and woolly. Palea indurate. Palea apex pubescent.
FLOWER Anthers 3; pallid.
FRUIT Caryopsis with adherent pericarp; 2.2–2.4 mm long.
DISTRIBUTION North America: Mexico. South America: Mesoamericana.
NOTES Paniceae. Davidse.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
