Setaria corrugata

HABIT Annual. Culms erect, or geniculately ascending; 50–100 cm long. Culm-nodes pubescent. Leaf-sheaths glabrous on surface; outer margin hairy. Ligule a fringe of hairs; 1 mm long. Leaf-blades 15–30 cm long; 4–7 mm wide. Leaf-blade surface scabrous; rough on both sides; glabrous to pubescent; hairy on both sides. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle. Peduncle scaberulous above.

Panicle spiciform; linear; dense; 3–15 cm long. Primary panicle branches sterile at the tips. Panicle axis angular; scabrous; villous.

Spikelets subtended by an involucre. Fertile spikelets pedicelled; 1 in the cluster. Involucre composed of bristles; 5–15 mm long. Involucral bristles persistent; 1–3 per spikelet; flexible; antrorsely scaberulous; glabrous. Pedicels oblong.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; compressed slightly; 2 mm long; falling entire.

GLUMES Glumes shorter than spikelet; 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; 0.75 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 0.75 length of lemma. Fertile lemma ovate; dorsally compressed; gibbous; 2 mm long; indurate; without keel. Lemma surface corrugate. Lemma margins involute. Palea involute; indurate.

DISTRIBUTION North America: southeast USA. South America: Caribbean.

NOTES Paniceae. Rominger 1994.

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