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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 stolonifera

HABIT Perennial. Stolons present. Basal innovations intravaginal. Culms 100–150 cm long; 1–2 mm diam. Culm-internodes distally glabrous. Culm-nodes brown; glabrous. Lateral branches ample. Leaf-sheaths mostly shorter than adjacent culm internode; glabrous on surface; outer margin glabrous. Ligule a ciliate membrane; 1–2 mm long. Collar glabrous. Leaf-blades 5–22 cm long; 3–7 mm wide. Leaf-blade midrib conspicuous. Leaf-blade surface glabrous. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; linear; interrupted; 2–9 cm long; 0.5–1 cm wide. Primary panicle branches accrescent to a central axis; with evident branchlets on axis. Panicle axis scaberulous; glabrous.

Spikelets subtended by an involucre. Fertile spikelets sessile; 1 in the cluster. Involucre composed of bristles; 4–10 mm long. Involucral bristles persistent; 1 per spikelet; flexible; antrorsely scaberulous; glabrous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 1.8–2.1 mm long; 1–1.1 mm wide; falling entire; readily shedding fertile florets.

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

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret ovate; 1 length of spikelet; membranous; 5 -veined; cuspidate. Palea of lower sterile floret 0.75–1 length of lemma. Fertile lemma ovate; dorsally compressed; gibbous; 1.8–2.1 mm long; 1–1.1 mm wide; indurate; shiny; without keel. Lemma surface smooth. Lemma margins involute. Lemma apex apiculate. Palea involute; indurate.

FLOWER Lodicules 2. Anthers 3.

FRUIT Caryopsis with adherent pericarp; orbicular; 1.2 mm long. Embryo 0.75 length of caryopsis. Hilum punctiform.

DISTRIBUTION South America: Brazil and southern South America.

NOTES Paniceae. Penseiro 1997.

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