Bouteloua chondrosoides

(Kunth) Benth. ex S. Watson
Common names: Sprucetop grama
Treatment appears in FNA Volume 25.

Plants perennial; cespitose, without rhizomes or stolons. Culms (10) 30-60 cm, erect, unbranched. Leaves mostly basal; sheaths mostly glabrous, margins often long-ciliate distally; ligules 0.3-0.6 mm, of hairs; blades 1-10 cm long, 1-2.5 (3) mm wide, flat, glaucous, bases with papillose-based hairs on the margins, similar hairs sometimes present on either or both surfaces. Panicles 2.5-6 cm, with 3-8 (10) branches; branches (8) 10-15 mm, densely pubescent, with 8-12 spikelets, axes extending to 5 mm beyond the base of the terminal spikelets, apices entire; disarticulation at the base of the branches. Spikelets appressed, all alike, 7-7.5 mm, with 1 bisexual and 1 rudimentary floret. Glumes evidently hairy; lower glumes 2.5-4.5 mm; upper glumes 4.5-6.5 mm; lowest lemmas 4.7-6.2 mm, hairy distally, 3-lobed, lobes unawned or shortly awned; lowest paleas 5-7.2 mm, pubescent along the veins and on the margins, bifid, veins excurrent as short awns; anthers 2.8-4 mm, yellow; upper florets rudimentary, glabrous, 3-awned, awns scabrous, sometimes arising from a short but evident awn column, central awns sometimes with a membranous margin, awns scabrous. Caryopses about 2.5 mm long, about 0.9 mm wide. 2n = 20, 22, 40.

Discussion

Bouteloua chondrosoides grows on dry, rocky slopes and grassy plateaus at 200-2500 m. Its range extends from southern Arizona and western Texas to Costa Rica. It resembles B. eludens in having pubescent panicle branches, but B. eludens usually has 12-16 branches 5-11 mm long with 2-6 spikelets whereas B. chrondrosoides usually has 3-8 branches 10-15 mm long with 8-12 spikelets per branch.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Bouteloua chondrosoides"
40 +, 22 +  and 20 +
1 +  and 3 +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
J.K. Wipff +
(Kunth) Benth. ex S. Watson +
1 (?) +  and 3 (?) +
well-developed +
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 /> (10 cm100 mm <br />0.1 m <br />) +
usually linear +  and lanceolate occasionally ovate +
1mm;2.5mm +
subdigitate +  and digitate +
8 cm80 mm <br />0.08 m <br /> (?) +
spikelike +
not woody +
2.5 cm25 mm <br />0.025 m <br /> (?) +
0.9 cm9 mm <br />0.009 m <br /> (?) +
triangular +  and dome--shaped +
sometimes longer +
membranous +
Sprucetop grama +
30 cm300 mm <br />0.3 m <br /> (60 cm600 mm <br />0.6 m <br />) +
not woody +
Conn. +, N.J. +, N.Y. +, W.Va. +, Mich. +, Alta. +, B.C. +, Man. +, Ont. +, Sask. +, D.C +, Wis. +, Ariz. +, N.Mex. +, Pacific Islands (Hawaii) +, Idaho +, Oreg. +, Fla. +, Wyo. +, Tex. +, La. +, Md. +, Maine +, Miss. +, S.C. +, N.C. +, Nebr. +, Tenn. +, Pa. +, Mass. +, Ala. +, Ga. +, Ill. +, Ind. +, Ky. +, Minn. +, N.Dak. +, Ohio +, S.Dak. +, Utah +, Mont. +, Va. +, Colo. +, Calif. +, Puerto Rico +, Virgin Islands +, Kans. +, Okla. +, Ark. +, Iowa +, Nev. +, Wash. +  and Mo. +
not waisted +
capillary +
pistillate +  and staminate +
4-lobed +  and trilobed +
sometimes longer +
rudimentary +
round +  and compressed +
reduced +
shorter or longer +
subtending +
both +  and 1 +
acuminate +  and acute +
subequal +  and unequal +
papillose-based +
uncinate +
paniculate +  and racemose +
hollow +  and solid +
not absent +
5-veined +, 7-13-veined +  and 1-3-veined +
sometimes longer +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
membranous +
inconspicuous +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
0.47 cm4.7 mm <br />0.0047 m <br /> (0.62 cm6.2 mm <br />0.0062 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.72 cm7.2 mm <br />0.0072 m <br />) +
concealed +  and prominent +
2 +  and 1 +
2.5 cm25 mm <br />0.025 m <br /> (6 cm60 mm <br />0.06 m <br />) +
dry +  and fleshy +
spikelike +
elongate +
flabellate +
sessile +  and subsessile +
8 +  and 12 +
terete +, compressed +  and pectinate +
0.7 cm7 mm <br />0.007 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
1 (?) +  and 3 (?) +
compound +  and simple +
2 (?) +  and 3 (?) +
Gramineae +
Bouteloua chondrosoides +
Bouteloua subg. Bouteloua +
species +
membranous +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
7 +  and 13 +
extended +
rhizomatous +  and stoloniferous +
plant +  and cespitose +
aquatic +  and terrestrial +