Setaria villosissima

(Scribn. & Merr.) K. Schum.
Common names: Hairyleaf bristlegrass
Treatment appears in FNA Volume 25. Treatment on page 548.

Plants perennial; cespitose. Culms 40-100 cm. Sheaths villous distally, margins ciliate; ligules about 1 mm, densely ciliate, hairs white; blades 15-30 cm long, 5-8 mm wide, both surfaces villous. Panicles 10-20 cm, loosely spicate; bristles usually solitary, 10-20 mm. Spikelets 2.8-3 mm. Lower glumes about 1/3 as long as the spikelets, broadly ovate, 3-veined; upper glumes nearly equaling the spikelets, 5-7-veined; lower lemmas equaling the upper lemmas, 5-veined; lower paleas about 1/5 as long as the upper paleas, lanceolate; upper lemmas finely and transversely undulate-rugose basally, striate and punctate distally; upper paleas similar, ovatelanceolate. 2n = 54.

Discussion

Setaria villosissima is a rare species that grows on granitic soils in southwestern Texas and northern Mexico. The villous sheaths and blades and large spikelets of S. villosissima aid in its identification. A.S. Hitchcock's (1951) report of Setaria villosissima from Arizona is based on misidentification of a specimen of S. leucophila (Reeder 1994).

Lower Taxa

None.

"decumbent" is not a number.

... more about "Setaria villosissima"
not penicillate +
anatomy +  and kranz +
James M. Rominger +
(Scribn. & Merr.) K. Schum. +
1 (?) +  and 3 (?) +
keeled +  and rounded +
pseudopetiolate +  and branching +
divergent +  and parallel +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
non-radiate +  and radiate +
15 cm150 mm <br />0.15 m <br /> (30 cm300 mm <br />0.3 m <br />) +
usually linear +  and lanceolate occasionally ovate +
20 cm200 mm <br />0.2 m <br /> (?) +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
spikelike +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
not developed +
compressed +, ellipsoid +  and subglobose +
sometimes longer +
Hairyleaf bristlegrass +
branched +  and solid +
decumbent +  and erect +
40 cm400 mm <br />0.4 m <br /> (100 cm1,000 mm <br />1 m <br />) +
Ariz. +  and Tex. +
capillary +
germination +
pistillate +  and staminate +
sometimes longer +
compressed +  and terete +
shorter or longer +
subtending +
unequal +
membranous +
uncinate +
bracteate +  and ebracteate +
solid +  and hollow +
cauline +  and basal +
coriaceous +
1 cm10 mm <br />0.01 m <br /> (?) +
membranous +
inconspicuous +
not constricted +
indurate +  and membranous +
rarely exceeding the upper lemmas +  and equaling +
complex +  and simple +
concealed +  and prominent +
2 +  and 1 +
subterranean +
spikelike +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
dry +  and fleshy +
reeder1994a +
subsessile +  and short pedicellate +
in triplets +  and paired +
unisexual +  and bisexual +
acutish +  and obtuse +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
1 +  and 3 +
fused +  and free +
red +  and white +
fused +  and free +
dome--shaped +  and triangular +
Gramineae +
Setaria villosissima +
Setaria subg. Setaria +
species +
membranous +
membranous +  and herbaceous +
striate and punctate +
undulate-rugose +
ovatelanceolate +
not keeled +
reduced +
plant +  and cespitose +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +