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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 alonsoi

HABIT Perennial; caespitose. Basal innovations intravaginal; flabellate. Culms erect, or geniculately ascending; 20–45 cm long; 1–2 mm diam.; 2–4 -noded. Culm-internodes 4–15 cm long. Culm-nodes glabrous, or pubescent. Lateral branches ample. Leaf-sheaths 2–6 cm long; without keel, or keeled; outer margin glabrous, or hairy. Leaf-sheath oral hairs bearded; 1–3(–5) mm long. Ligule a ciliate membrane; 2.1–4 mm long. Leaf-blades flat, or conduplicate, or involute; 3–15 cm long; 2–3 mm wide; stiff; glaucous. Leaf-blade surface scaberulous; glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; linear; 5–12 cm long; 0.6–1 cm wide. Primary panicle branches sterile at the tips. Panicle axis scaberulous; glabrous.

Spikelets subtended by an involucre. Fertile spikelets pedicelled; 1 in the cluster. Involucre composed of bristles; 10–13 mm long. Involucral bristles persistent; 1 per spikelet; antrorsely scaberulous; glabrous. Pedicels oblong; 0.2–0.3 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; gibbous; 3 mm long; 2 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 acute. 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; 5–7 -veined; acute. Palea of lower sterile floret 0.7–0.8 length of lemma. Fertile lemma ovate; dorsally compressed; gibbous; 3 mm long; 2 mm wide; indurate; yellow, or light brown; without keel. Lemma surface rugulose. Lemma margins involute. Lemma apex apiculate. Palea involute; indurate.

FLOWER Lodicules 2; 0.3–0.5 mm long.

FRUIT Caryopsis with adherent pericarp; 1.5 mm long. Embryo 0.75 length of caryopsis. Hilum punctiform.

DISTRIBUTION South America: southern South America.

NOTES Paniceae. Pensiero & Anton 2000.

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