Bouteloua breviseta

Vasey
Common names: Gypsum grama
Treatment appears in FNA Volume 25. Treatment on page 267.

Plants perennial; sometimes cespitose, sometimes rhizomatous, rhizomes 1-3 mm thick, short or elongate, scaly. Culms 20-40 cm, erect, somewhat woody at the base, branching at the base and, in late fall, sometimes at the aerial nodes; nodes usually 4-5; internodes glabrous, distal portions of the lower internodes with a thick, white, chalky bloom. Ligules 0.1-0.2 mm, of hairs; blades 1-4 (7) cm long, 0.5-2 mm wide, flat basally, involute and arcuate to reflexed distally. Panicles 2-A cm, with 1-3 (4) branches; branches 15-37 mm, persistent, straight to slightly arcuate, mostly appressed, stramineous, with 30-45 spikelets, branches terminating in a reduced, needlelike, 2-5 mm spikelet; disarticulation above the glumes. Spikelets pectinate, with 1 bisexual floret and 1-2 rudimentary florets. Glumes acute to acuminate, glabrous or sparsely short-hairy, hairs not papillose-based; lower glumes 2-2.5 mm; upper glumes 2-3.5 mm; lowest lemmas 2.5-4 mm, sparsely to densely hairy, 3-awned, awns slightly shorter than the lemma bodies, central awns flanked by 2 membranous lobes; lowest paleas about 4.5 mm, mostly or completely glabrous, sometimes puberulent distally, acute to acuminate, unawned, veins not excurrent; second florets about 4.5 mm, 3-awned, awns 3-5 mm; rachilla segments subtending second florets with densely pubescent apices; third florets, if present, flabellate scales, 1-awned. Caryopses 1-1.2 mm long, about 0.4 mm wide. 2n = 20.

Discussion

Bouteloua breviseta is locally abundant on gypsum soils in southeastern New Mexico and the northern portion of the Trans Pecos region in Texas. It also grows in the state of Chihuahua, Mexico. Reeder and Reeder (1980) provide an excellent discussion of B. breviseta and B. ramosa.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Bouteloua breviseta"
1 +  and 3 +
J.K. Wipff +
1 (?) +  and 3 (?) +
well-developed +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
not fused +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
not pseudopetiolate +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
pubescent +  and glabrous +
usually linear +  and lanceolate occasionally ovate +
0.5mm;2mm +
chalky +  and white +
subdigitate +  and digitate +
75 cm750 mm <br />0.75 m <br /> (?) +
stramineous +
straight +  and slightly arcuate +
persistent +
spikelike +
not woody +
0.1 cm1 mm <br />0.001 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (?) +
triangular +  and dome--shaped +
sometimes longer +
membranous +
Gypsum grama +
20 cm200 mm <br />0.2 m <br /> (40 cm400 mm <br />0.4 m <br />) +
N.Mex. +  and Tex. +
not waisted +
capillary +
pistillate +  and staminate +
4-lobed +  and trilobed +
sometimes longer +
round +  and compressed +
reduced +
shorter or longer +
subtending +
short-hairy +  and glabrous +
both +  and 1 +
acute +  and acuminate +
subequal +  and unequal +
not papillose-based +
uncinate +
paniculate +  and racemose +
hollow +  and solid +
not absent +
5-veined +, 7-13-veined +  and 1-3-veined +
sometimes longer +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
membranous +
membranous +
inconspicuous +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
puberulent +  and glabrous +
acute +  and acuminate +
4.5 cm45 mm <br />0.045 m <br /> (?) +
concealed +  and prominent +
4 +  and 5 +
2 +  and 1 +
dry +  and fleshy +
spikelike +
elongate +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
flabellate +
sessile +  and subsessile +
30 +  and 45 +
pectinate +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
1 (?) +  and 3 (?) +
compound +  and simple +
2 (?) +  and 3 (?) +
Gramineae +
Bouteloua breviseta +
Bouteloua subg. Chondrosum +
species +
membranous +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
not excurrent +
7 +  and 13 +
extended +
plant +  and cespitose +
aquatic +  and terrestrial +