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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 cordobensis

HABIT Perennial; caespitose. Basal innovations flabellate. Culms geniculately ascending; 30–100 cm long; 0.5–1 mm diam.; 3–5 -noded. Culm-internodes 8–11 cm long; distally glabrous. Culm-nodes glabrous. Lateral branches lacking, or sparse. Leaf-sheaths keeled; outer margin glabrous. Ligule a ciliate membrane; 1.5–2 mm long. Leaf-blades linear, or lanceolate; flat, or conduplicate; 12–30 cm long; 4–13 mm wide. Leaf-blade midrib conspicuous. Leaf-blade surface scaberulous; glabrous. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; linear; continuous, or interrupted; 5–15 cm long; 1.5–2 cm wide. Primary panicle branches sterile at the tips. Panicle axis scabrous.

Spikelets subtended by an involucre. Fertile spikelets pedicelled; 1 in the cluster. Involucre composed of bristles; 6–12 mm long. Involucral bristles persistent; 1–2 per spikelet; antrorsely scaberulous; glabrous. Pedicels oblong.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; gibbous; 3–3.3 mm long; 1.7–2.1 mm wide; falling entire.

GLUMES Glumes shorter than spikelet, or reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 0.33–0.5 length of spikelet; membranous; without keels; 3–5 -veined. Lower glume apex obtuse. Upper glume ovate; gibbous; 0.75–1 length of spikelet; membranous; without keels; 5–7 -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 0.25–1 length of lemma. Fertile lemma ovate; dorsally compressed; gibbous; 3–3.3 mm long; indurate; without keel. Lemma surface rugulose. Lemma margins involute. Lemma apex apiculate. Palea involute; indurate.

FRUIT Caryopsis with adherent pericarp; ovoid; 2 mm long. Embryo 0.8 length of caryopsis.

DISTRIBUTION South America: western South America and southern South America.

NOTES Paniceae. Pensiero 1995.

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