Setaria parviflora
Setaria corrugata
knot-root bristlegrass, knotroot foxtail, marsh bristle grass, yellow bristlegrass
coastal bristlegrass
30-120 cm;
nodes glabrous.
to 100 cm;
nodes hispid, hairs appressed.
glabrous;
ligules shorter than 1 mm, of hairs;
blades to 25 cm long, 2-8 mm wide, flat, scabrous above.
glabrous or pilose, margins ciliate distally;
ligules about 1 mm, ciliate;
blades 15-30 cm long, 4-7 mm wide, flat, scabrous or pubescent.
3-8 (10) cm, of uniform width throughout their length, densely spikelike;
rachises scabro-hispid;
bristles 4-12, 2-12 mm, antrorsely barbed, yellow to purple.
3-15 cm, densely spicate;
rachises rough hispid and sparsely villous;
bristles 1-3, 5-15 mm, flexible, antrorsely scabrous.
2-2.8 mm, elliptical and turgid.
about 2 mm, turgid.
about 1/3 as long as the spikelets, 3-veined;
upper glumes 1/2 - 2/3 as long as the spikelets, 5-veined;
lower florets often staminate;
lower lemmas occasionally indurate and faintly transversely rugose;
lower paleas equaling the lower lemmas;
upper lemmas distinctly transversely rugose, often purple-tipped.
1/3 – 1/2 as long as the spikelets, 3-5-veined;
upper glumes about 3/4 as long as the upper lemmas, 5-7-veined;
lower lemmas equaling the upper lemmas;
lower paleas 3/4 as long as the lower lemmas, hyaline;
upper lemmas very coarsely and transversely rugose;
upper paleas similar to the upper lemmas.
= 36, 72.
= unknown.
Setaria parviflora
Setaria corrugata
Setaria parviflora is a common, native species of moist ground. It is most frequent along the Atlantic and Gulf coasts, but it also grows from the Central Valley of California east through the central United States and southward through Mexico to Central America, as well as in the West Indies. The plant from Oregon was found on a ballast dump; the species is not established in that state.
Setaria parviflora is the most morphologically diverse and widely distributed of the indigenous perennial species of Setaria.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Setaria corrugata grows in pinelands and cultivated fields along the southeastern coast of the United States. It is also found in Cuba and the Dominican Republic. Superficially, it resembles S. viridis, but is easily distinguished from that species by its coarsely rugose ("corrugated") lower lemmas.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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