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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 ruscifolia
HABIT Perennial; caespitose. Culms scandent; 100–800 cm long; 5–12 mm diam.; woody. Culm-internodes hollow; distally glabrous, or pubescent, or with pubescent line. Culm-nodes glabrous, or pubescent. Leaf-sheaths glabrous on surface to hispid; with tubercle-based hairs; outer margin hairy. Leaf-sheath oral hairs ciliate; 3 mm long. Ligule an eciliate membrane, or a ciliate membrane; 0.3–1 mm long. Collar glabrous, or pubescent. Leaf-blade base asymmetrical. Leaf-blades lanceolate, or ovate; 4–16 cm long; 10–56 mm wide. Leaf-blade surface glabrous to hispid. Leaf-blade margins scabrous; ciliate; hairy at base. Leaf-blade apex acute, or acuminate.
INFLORESCENCE Inflorescence a panicle.
Panicle open; ovate; dense; (2–)4–16(–22) cm long. Primary panicle branches spreading; 1–6 cm long. Panicle branches scaberulous; glabrous in axils, or pubescent in axils.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension (but with a distinct shelf at base of upper lemma). Spikelets orbicular; tilted on the pedicel; dorsally compressed; 2.8–4 mm long; falling entire.
GLUMES Glumes dissimilar; reaching apex of florets; thinner than fertile lemma; shiny. Lower glume oblate; 1.2–2 mm long; 0.5 length of spikelet; membranous; black; without keels; 9–13 -veined. Lower glume surface woolly; hairy at apex. Lower glume apex obtuse. Upper glume ovate; 1 length of spikelet; membranous; black; without keels; 11–13 -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; 2.8–3.6 mm long; 2–2.4 mm wide; indurate; dark brown, or black; shiny; without keel. Lemma margins involute. Lemma apex obtuse; with a shallow excavation and woolly. Palea indurate. Palea apex pubescent.
FLOWER Anthers 3; 1.4–2.3 mm long; pallid. Stigmas white.
FRUIT Caryopsis with adherent pericarp; 2–2.5 mm long.
DISTRIBUTION North America: Mexico. South America: Mesoamericana, Caribbean, northern South America, western South America, and southern South America.
NOTES Paniceae. Davidse.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
