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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Setaria leucopila

HABIT Perennial; caespitose. Culms erect, or geniculately ascending; 20–100 cm long. Culm-internodes elliptical in section; distally glabrous, or pubescent. Lateral branches lacking, or sparse. Leaf-sheaths keeled; glabrous on surface; outer margin hairy. Ligule a fringe of hairs; 1–2.5 mm long. Collar glabrous, or pubescent, or pilose. Leaf-blades flat, or conduplicate; 8–25 cm long; 2–5 mm wide. Leaf-blade surface scabrous; rough adaxially, or on both sides. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; linear; continuous, or interrupted; dense; tapering above; 8–15 cm long; 1–1.5 cm wide. Primary panicle branches sterile at the tips. Panicle axis angular; scabrous; glabrous, or villous.

Spikelets subtended by an involucre. Fertile spikelets pedicelled; 1 in the cluster. Involucre composed of bristles; 4–15 mm long. Involucral bristles persistent; 1 per spikelet; flexible; antrorsely scaberulous; glabrous. Pedicels oblong.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 2.2–2.5 mm long; falling entire.

GLUMES Glumes shorter than spikelet, or reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 0.5 length of spikelet; membranous; without keels; 3 -veined. Lower glume apex acute. Upper glume ovate; 0.75–1 length of spikelet; membranous; without keels; 5 -veined. Upper glume apex acute.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret ovate; 1 length of spikelet; membranous; 5 -veined; acute. Palea of lower sterile floret 0.5–0.75 length of lemma. Fertile lemma ovate; dorsally compressed; gibbous; 2.2–2.5 mm long; indurate; without keel. Lemma surface rugulose. Lemma margins involute. Lemma apex apiculate. Palea involute; indurate.

DISTRIBUTION North America: northwest USA, southwest USA, south-central USA, and Mexico. South America: southern South America.

NOTES Paniceae. Rominger 1994.

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