Setaria adhaerans
Setaria macrosperma
bur bristlegrass, tropical barbed bristlegrass
coral bristlegrass
25-60 cm.
1-1.5 m. Sheaths prominently keeled, margins villous;
ligules 1-3 mm;
blades 1-2 cm wide, flat, scabrous.
glabrous throughout;
ligules 1-2 mm, of hairs, white;
blades usually less than 10 cm long, 5-10 mm wide, flat, broad basally, abaxial surfaces conspicuously strigose with papillose-based hairs, tapering abruptly at the apices;
bristles solitary, about 5 mm, retrorsely scabrous.
2-6 cm, verticillate, green to purple;
rachises retrorsely rough hispid.
to 25 cm, loosely spicate;
rachises readily visible, sparsely villous;
bristles 1(2), 15-30 mm, flexible, antrorsely scabrous.
1.5-2.2 mm.
3-3.2 mm.
about 1/2 as long as the spikelets, obtuse, 1(3)-veined;
upper glumes nearly as long as the spikelets, 5-7-veined;
lower lemmas equaling to slightly exceeding the upper lemmas;
lower paleas less than 1/2 as long as the spikelets, scalelike;
upper lemmas finely and transversely rugose;
upper paleas similar to the upper lemmas.
about 1/3 as long as the spikelets, 3-veined;
upper glumes about 3/4 as long as the spikelets, 5-veined;
lower lemmas equaling the upper lemmas;
lower paleas about 1/2 as long as the upper paleas, hyaline, narrow;
upper lemmas finely and transversely rugose;
upper paleas similar to the upper lemmas.
= 18.
= unknown.
Setaria adhaerans
Setaria macrosperma
Setaria adhaerans grows in subtropical regions throughout the world. In North America, it is known from the southern United States, northeastern Mexico, Guatemala, Cuba, and the Bahamas. The Californian record may represent a recent introduction.
Setaria adhaerans resembles the temperate S. verticillata, but differs in having shorter panicles, shorter spikelets, glabrous sheath margins, and papillose-based strigose hairs on the blades.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Setaria macrosperma grows on shell or coral islands, and occasionally in old fields or hammocks. It is most frequent in Florida, but has been collected in both South Carolina and Georgia. It also grows in the Bahamas and Mexico.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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