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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 grisebachii
HABIT Perennial; mat forming. Culms rambling; 30–60 cm long; 2–3 mm diam.; firm, or woody; rooting from lower nodes. Culm-internodes hollow; distally pubescent (all over or in a line). Culm-nodes glabrous. Lateral branches ample. Leaf-sheaths pubescent, or hirsute; outer margin hairy. Ligule an eciliate membrane, or a ciliolate membrane; 0.3–0.6 mm long. Leaf-blade base asymmetrical. Leaf-blades linear, or lanceolate; 6–14 cm long; 6–11(–14) mm wide. Leaf-blade surface pubescent; hairy abaxially. Leaf-blade margins scabrous. Leaf-blade apex acuminate.
INFLORESCENCE Inflorescence a panicle.
Panicle open; lanceolate; (2–)5–13(–16) cm long. Primary panicle branches 1–5(–7) cm long; bearing spikelets almost to the base. Panicle branches stiff; scabrous; pubescent in axils.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension, or with a barren rhachilla extension. Spikelets orbicular; dorsally compressed; obtuse; 3.5–3.8 mm long; falling entire.
GLUMES Glumes dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume oblate; gibbous; 1.5–2.2 mm long; 0.4–0.6 length of spikelet; membranous; pallid, or black (at maturity); without keels; 5–7 -veined. Lower glume apex acute. Upper glume orbicular; 1 length of spikelet; membranous; pallid, or black (at maturity); without keels; 7–11 -veined. 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; 7–11 -veined; obtuse. Palea of lower sterile floret 1 length of lemma. Fertile lemma orbicular; dorsally compressed; 3–3.1 mm long; indurate; dark brown; shiny; without keel. Lemma margins involute. Lemma apex obtuse; with a shallow excavation and woolly. Palea indurate. Rhachilla extension 0.02 length of fertile floret (a point 0.1mm long).
FLOWER Anthers 3; 2 mm long.
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.
