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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 sloanei
HABIT Perennial; caespitose. Culms erect, or scandent; 100–600 cm long; 4–10 mm diam. Culm-internodes hollow; distally with pubescent line. Culm-nodes glabrous. Leaf-sheaths glabrous on surface; outer margin hairy. Leaf-sheath oral hairs ciliate; 1.5–3 mm long. Ligule a ciliolate membrane; 0.5–1 mm long; pubescent on abaxial surface. Collar pubescent. Leaf-blade base asymmetrical; with a brief petiole-like connection to sheath; petiole 0.1–0.3 cm long; petiole pubescent. Leaf-blades lanceolate, or ovate; 8–16 cm long; (13–)17–40(–45) mm wide. Leaf-blade surface smooth; glabrous. Leaf-blade margins scabrous. Leaf-blade apex acuminate.
INFLORESCENCE Inflorescence a panicle.
Panicle open; ovate; 6–34 cm long; bearing few spikelets. Primary panicle branches spreading; 2–15 cm long. Panicle branches scabrous; glabrous in axils, or pubescent in axils.
Spikelets appressed; 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; (4–)4.3–4.8(–5.3) mm long; falling entire.
GLUMES Glumes dissimilar; reaching apex of florets; thinner than fertile lemma; shiny. Lower glume oblate; 1.5–2.6 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; 9–13 -veined. Upper glume surface woolly; hairy at apex. Upper glume apex obtuse.
FLORETS Basal sterile florets male, or barren; with palea. Lemma of lower sterile floret similar to upper glume; ovate; 1 length of spikelet; membranous; 9–13 -veined; woolly; hairy at apex; obtuse. Palea of lower sterile floret 0.75–1 length of lemma. Fertile lemma ovate; dorsally compressed; 3.8–4.3 mm long; 2.2–2.6 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; 1.5–2.2 mm long; pallid. Stigmas white.
FRUIT Caryopsis with adherent pericarp; 2.3–2.6 mm long; pallid.
DISTRIBUTION North America: Mexico. South America: Mesoamericana, Caribbean, northern South America, and western South America.
NOTES Paniceae. Davidse.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
