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 rugelii

HABIT Perennial; caespitose. Culms erect, or scandent; zigzag; 60–300 cm long; 2–5 mm diam.; woody. Culm-internodes hollow; distally pubescent; with tubercle-based hairs. Culm-nodes glabrous, or pubescent. Lateral branches ample, or fastigiate. Leaf-sheaths puberulous; outer margin hairy. Leaf-sheath oral hairs ciliate; 1–2 mm long. Ligule an eciliate membrane, or a ciliolate membrane; 0.1–0.3 mm long. Collar pubescent. Leaf-blade base asymmetrical. Leaf-blades lanceolate, or ovate; (2.5–)3.5–5.5(–9.5) cm long; (5–)8–15(–22) mm wide. Leaf-blade surface puberulous; hairy on both sides. Leaf-blade margins scabrous. Leaf-blade apex acute, or acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 2–10 cm long. Primary panicle branches spreading, or reflexed; 1–5.5 cm long. Panicle branches puberulous; pubescent 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; 3.8–4.8 mm long; falling entire.

GLUMES Glumes dissimilar; reaching apex of florets; thinner than fertile lemma; shiny. Lower glume oblate; 1.5–2.1 mm long; 0.4–0.5 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 spikelet; 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 0.75–1 length of lemma. Fertile lemma ovate; dorsally compressed; 3.8–4.1 mm long; 2.3–2.6 mm wide; indurate; light brown; shiny; without keel. Lemma margins involute. Lemma apex obtuse; with a shallow excavation and woolly. Palea indurate. Palea apex pubescent.

FLOWER Anthers 3.

FRUIT Caryopsis with adherent pericarp; 2.4–2.6 mm long; pallid.

DISTRIBUTION North America: Mexico. South America: Mesoamericana and Caribbean.

NOTES Paniceae. Davidse.

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