Bouteloua barbata var. barbata

Common names: Sixweeks grama
Treatment appears in FNA Volume 25. Treatment on page 265.

Plants annual; not stoloniferous. Culms 1-35 cm, usually decumbent and geniculate, occasionally rooting at the lower nodes. Ligules 0.4-1 mm; blades 0.5-5 (9) cm long, 0.7-3 mm wide. Panicles 0.7-9 cm, with (2) 4-11 branches; branches 10-27 mm, scabrous, with 20-40 spikelets. 2n = 20.

Discussion

Bouteloua barbata var. barbata grows in loose sands, rocky slopes, and washes, often on disturbed soils, usually at elevations below 2000 m. Its range extends from the southwestern United States to northwestern Mexico.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

1 +  and 3 +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
puberulent +  and glabrous +
J.K. Wipff +
1 (?) +  and 3 (?) +
well-developed +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
not fused +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
not pseudopetiolate +
0.5 cm5 mm <br />0.005 m <br /> (5 cm50 mm <br />0.05 m <br />) +
pubescent +  and glabrous +
usually linear +  and lanceolate occasionally ovate +
0.7mm;3mm +
subdigitate +  and digitate +
75 cm750 mm <br />0.75 m <br /> (?) +
straight +  and arcuate +
persistent +
scabridulous +
spikelike +
not woody +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
triangular +  and dome--shaped +
sometimes longer +
membranous +
Sixweeks grama +
erect +  and decumbent +
geniculate +
1 cm10 mm <br />0.01 m <br /> (35 cm350 mm <br />0.35 m <br />) +
not woody +
Md. +, Kans. +, Okla. +, Colo. +, N.Mex. +, Tex. +, Utah +, Calif. +, Mont. +, Ariz. +, Oreg. +  and Nev. +
not waisted +
capillary +
pistillate +  and staminate +
4-lobed +  and trilobed +
sometimes longer +
rudimentary +
2 +  and 1 +
flabellate +  and 2-lobed +
reduced +
1.5mm +  and 4mm +
shorter or longer +
subtending +
both +  and 1 +
scabridulous +
acuminate +  and acute +
unequal +
not papillose-based +  and papillose-based +
uncinate +
paniculate +  and racemose +
hollow +  and solid +
not absent +
cauline +  and basal +
5-veined +, 7-13-veined +  and 1-3-veined +
sometimes longer +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
membranous +
rounded +
membranous +
inconspicuous +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
concealed +  and prominent +
2 +  and 1 +
0.7 cm7 mm <br />0.007 m <br /> (9 cm90 mm <br />0.09 m <br />) +
dry +  and fleshy +
spikelike +
elongate +
flabellate +
sessile +  and subsessile +
well-developed +
20 +  and 40 +
pectinate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
1 (?) +  and 3 (?) +
compound +  and simple +
2 (?) +  and 3 (?) +
Chondrosum barbatum +
Bouteloua barbata var. barbata +
Bouteloua barbata +
variety +
membranous +
strigose +, scabrous +  and glabrous +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
7 +  and 13 +
extended +
aquatic +  and terrestrial +