Setaria grisebachii
Setaria magna
Grisebach bristlegrass, Grisebach's bristlegrass
giant bristlegrass
30-100 cm;
nodes pubescent, hairs appressed.
to 6 m tall, 2-3 cm thick at the base.
with ciliate margins;
ligules ciliate;
blades to 12(25) cm long, to 10(20) mm wide, flat, hispid on both surfaces.
glabrous, smooth or scabrous, margins villous distally;
ligules 1-2 mm, ciliate;
blades to 60 cm long, to 3.5 cm wide, flat.
3-18 cm, loosely spicate, interrupted, often purple;
rachises hispid;
bristles 1-3, 5-15 mm, flexible, antrorsely scabrous.
to 50 cm long, to 5 cm wide, densely spikelike;
rachises densely villous;
bristles 1 or 2, 10-20 mm, flexible, antrorsely scabrous.
1.5-2.2 mm.
about 2 mm, disarticulating between the lower and upper florets.
about 1/3 as long as the spikelets, distinctly 3-veined, lateral veins coalescing with the central veins below the apices;
upper glumes nearly equaling the upper lemmas, obtuse, 5-veined;
lower lemmas equaling the upper lemmas;
lower paleas about 1/3 as long as the lower lemmas, narrow;
upper lemmas finely and transversely rugose;
upper paleas similar to the upper lemmas.
1/3 as long as the spikelets, 3-veined;
upper glumes equaling the lower lemmas, 7-veined;
lower florets often staminate;
lower lemmas slightly exceeding the upper lemmas;
lower paleas equaling the lower lemmas, broad, hyaline, minutely pubescent over the veins;
upper lemmas smooth and shiny brown;
upper paleas similar to the upper lemmas.
= unknown.
= 36.
Setaria grisebachii
Setaria magna
Setaria grisebachii is the most widespread and abundant native annual species of Setaria in the south-western United States. It grows in open ground and extends along the central highlands of Mexico to Guatemala, usually at elevations of 750-2500 m. The specimens from Maryland were collected on chrome ore piles; the species is not established in the state.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Setaria magna grows in saline marshes along the eastern coast of the United States. There are also disjunct populations in brackish swamps in Arkansas, and in Texas and southeastern New Mexico as well as in Jamaica, Puerto Rico, Bermuda, Mexico, and Costa Rica. It may have been recently introduced to some of these regions, including inland areas of the Flora region.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
MD Biodiversity
WildflowerSearch
iNaturalist
USDA Plants Database
LA Plants
