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.

Lasiacis scabrior

HABIT Perennial; caespitose. Culms erect, or scandent; 100–600 cm long; 7–13 mm diam.; woody. Culm-internodes hollow; distally pubescent, or with pubescent line. Culm-nodes glabrous. Leaf-sheaths pubescent to hirsute; outer margin hairy. Leaf-sheath oral hairs ciliate; 2–3.5 mm long. Ligule an eciliate membrane; (3.5–)4–6(–7) mm long; brown; glabrous on abaxial surface, or pubescent on abaxial surface; lacerate. Collar glabrous, or pubescent. Leaf-blade base asymmetrical. Leaf-blades lanceolate, or elliptic; (6–)8–12(–16) cm long; 10–22(–30) mm wide. Leaf-blade surface scabrous; rough adaxially; puberulous; hairy abaxially. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle; embraced at base by subtending leaf.

Panicle open; globose; (1–)4–9 cm long. Primary panicle branches spreading, or reflexed; (1–)2–5 cm long. Panicle branches pubescent; pubescent in axils.

Spikelets spreading; 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; 3.5–4.5 mm long; falling entire.

GLUMES Glumes dissimilar; reaching apex of florets; thinner than fertile lemma; shiny. Lower glume oblate; (1.2–)1.7–2(–2.8) mm long; 0.5 length of spikelet; membranous; black; without keels; 7–11 -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 0.66–1 length of lemma. Fertile lemma ovate; dorsally compressed; 3.5–3.6 mm long; 1.8–2 mm wide; indurate; dark brown; shiny; without keel. Lemma surface with a median groove. Lemma margins involute. Lemma apex obtuse; with a shallow excavation and woolly. Palea indurate. Palea apex pubescent.

FLOWER Anthers 3; 2 mm long; pallid. Stigmas white.

FRUIT Caryopsis with adherent pericarp; 2.1–2.3 mm long.

DISTRIBUTION North America: Mexico. South America: Mesoamericana, northern South America, and western South America.

NOTES Paniceae. Davidse.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.