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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 paucifolia

HABIT Perennial; caespitose. Rhizomes short. Basal innovations intravaginal. Culms 100–200 cm long; 2–4 mm diam.; 4–5 -noded. Culm-nodes glabrous. Leaf-sheaths glabrous on surface, or puberulous; outer margin glabrous, or hairy. Ligule a ciliate membrane; 1 mm long. Leaf-blade base with a false petiole. Leaf-blades filiform; involute, or convolute; 20–70 cm long; 0.2–0.4 mm wide. Leaf-blade surface glabrous, or pubescent; hairy abaxially. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; linear; continuous; 13–35 cm long; 0.8–1.4 cm wide. Primary panicle branches sterile at the tips. Panicle axis scaberulous; with scattered hairs, or glabrous.

Spikelets subtended by an involucre. Fertile spikelets pedicelled; 1 in the cluster. Involucre composed of bristles; 5–10 mm long. Involucral bristles persistent; 1(–2) per spikelet; antrorsely scaberulous; glabrous, or ciliate. Pedicels oblong.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; gibbous; 2.4–3 mm long; 0.8–1 mm wide; falling entire.

GLUMES Glumes shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 0.25–0.33 length of spikelet; membranous; without keels; 3–5 -veined. Lower glume apex acute. Upper glume ovate; gibbous; 0.33–0.5 length of spikelet; membranous; without keels; 5 -veined. Upper glume apex obtuse.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret ovate; 1 length of spikelet; membranous; 5 -veined; acute. Fertile lemma elliptic; dorsally compressed; gibbous; 2.4–3 mm long; indurate; without keel. Lemma surface rugulose. Lemma margins involute; ciliate. Palea involute; indurate. Palea keels ciliolate.

FLOWER Anthers 1.7 mm long.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: Brazil and southern South America.

NOTES Paniceae. Pensiero 1995.

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