Setaria viridis
green bristle grass, green foxtail, setaire verte
20-250 cm;
nodes glabrous.
glabrous, sometimes scabridu-lous, margins ciliate distally;
ligules 1-2 mm, ciliate;
blades to 20 cm long, 4-25 mm wide, flat, scabrous or smooth, glabrous.
3-20 cm, densely spicate, nodding only from near the apices;
rachises hispid and villous;
bristles 1-3, 5-10 mm, antrorsely scabrous, usually green, rarely purple.
1.8-2.2 mm.
about as long as the spikelets, triangular-ovate, 3-veined;
upper glumes nearly equaling the upper lemmas, elliptical, 5-6-veined;
lower lemmas slightly exceeding the upper lemmas, 5-veined;
lower paleas about as long as the lower lemmas, hyaline;
upper lemmas very finely and transversely rugose, pale green, 5-6-veined;
upper paleas similar to the upper lemmas.
= 18.
Setaria viridis
Setaria viridis resembles S. italica but differs in its shorter spikelets and rugose upper florets, and mode of disarticulation. It is also a more aggressive weed. It is native to Eurasia but is now widespread in warm temperate regions of the world.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Culms 100-250 cm tall; blades 10-25 mm wide; panicles 10-20 cm long | var. major |
1. Culms 20-100 cm tall; blades 4-12 mm wide; panicles 3-8 cm long | var. viridis |
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