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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 paraguayensis

HABIT Perennial; caespitose. Rhizomes short. Basal innovations intravaginal; flabellate. Culms erect, or geniculately ascending; 50–100 cm long; 2–3 mm diam.; 2–3 -noded. Culm-internodes distally glabrous, or pubescent. Lateral branches lacking. Leaf-sheaths longer than adjacent culm internode; keeled; glabrous on surface; outer margin hairy. Leaf-sheath oral hairs lacking, or ciliate. Ligule a fringe of hairs; 1–2 mm long. Collar glabrous. Leaf-blades 20–55 cm long; 15–18 mm wide. Leaf-blade midrib conspicuous. Leaf-blade surface scaberulous. Leaf-blade margins glabrous, or ciliate. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle. Peduncle antrorsely scabrous above.

Panicle spiciform; linear, or lanceolate; loose; tapering above; 10–26 cm long; 1.5–3 cm wide. Primary panicle branches 1–3 cm long; sterile at the tips. Panicle axis scabrous and retrorsely scabrous.

Spikelets subtended by an involucre. Fertile spikelets pedicelled; 1 in the cluster. Involucre composed of bristles; 14–20 mm long. Involucral bristles persistent; 1 per spikelet; flexible; retrorsely scaberulous; retrorse above, antrorse below, or mingled with antrorse scabridity; glabrous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; gibbous; 2.5–3 mm long; 1.5–2 mm wide; falling entire.

GLUMES Glumes shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 0.33–0.5 length of spikelet; membranous; without keels; 5 -veined. Lower glume apex acute. Upper glume ovate; (0.5–)0.75 length of spikelet; membranous; without keels; 7–9 -veined. Upper glume apex acute.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret ovate; 1 length of spikelet; membranous; 7 -veined; acute. Fertile lemma ovate; dorsally compressed; gibbous; 2.5–3 mm long; 1.8–2 mm wide; indurate; yellow; without keel. Lemma surface rugulose. Lemma margins involute. Lemma apex apiculate. Palea involute; indurate.

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

NOTES Paniceae. Penseiro 2002.

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