Bouteloua hirsuta subsp. hirsuta

Common names: Hairy grama
Synonyms: Bouteloua hirsuta var. glandulosa Bouteloua glandulosa
Treatment appears in FNA Volume 25. Treatment on page 262.

Plants loosely or densely cespitose, sometimes stoloniferous. Culms 15-60 cm, usually decumbent and branched basally, sometimes erect, branched or unbranched from the aerial nodes; nodes usually 4-6; internodes glabrous or sparsely to densely pubescent with papillose-based hairs. Leaves basally clustered, sometimes not strongly so; sheaths glabrous or pubescent, hairs not papillose-based, sometimes scabrous. Panicles with 1-4 branches on 0.7-7.5 (9.2) cm rachises or digitate; branches 1-4. Anthers 2-2.5 mm; rachilla segments subtending second florets without a distal tuft of hairs. Caryopses 1.4-2 mm. 2n = 20, 40, 50, 60; numerous dysploid numbers also reported.

Discussion

Bouteloua hirsuta subsp. hirsuta grows from the open plains to slightly shaded openings in woods and brush on well-drained, often rocky, soils at 50-300 m. It is morphologically, ecologically, and cytologically more variable than subsp. pectinata. Its range extends from North Dakota and Minnesota to central Mexico. In the northern portion of its range, it is not densely tufted and the culms are decumbent and branched; in the southwestern United States and northern Mexico, it grows in isolated, dense clumps, with erect, stout, unbranched culms and mostly basal leaves.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

60 +, 50 +, 40 +  and 20 +
yellow +  and cream +
1 +  and 3 +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
J.K. Wipff +
1 (?) +  and 3 (?) +
6 cm60 mm <br />0.06 m <br /> (?) +
well-developed +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
membranous +
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 /> (30 cm300 mm <br />0.3 m <br />) +
pubescent +  and glabrous +
flat +  and involute +
1mm;2.5mm +
75 cm750 mm <br />0.75 m <br /> (?) +
persistent +
spikelike +
not woody +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
triangular +  and dome--shaped +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
sometimes longer +
membranous +
Hairy grama +
unbranched +  and branched +
15 cm150 mm <br />0.15 m <br /> (60 cm600 mm <br />0.6 m <br />) +
not woody +
Wis. +, Fla. +, Wyo. +, N.Mex. +, Tex. +, La. +, Md. +, Miss. +, N.Y. +, Nev. +, Colo. +, Kans. +, N.Dak. +, Nebr. +, Okla. +, S.Dak. +, Ark. +, Ga. +, Ill. +, Maine +, Minn. +, Mont. +, S.C. +, Utah +, Iowa +, Ariz. +, Ohio +  and Mo. +
not waisted +
capillary +
pistillate +  and staminate +
4-lobed +  and trilobed +
sometimes longer +
pubescent +  and glabrous +
round +  and compressed +
reduced +
shorter or longer +
subtending +
both +  and 1 +
acuminate +
subequal +  and unequal +
not papillose-based +  and papillose-based +
uncinate +
paniculate +  and racemose +
hollow +  and solid +
glabrous or +  and sparsely densely pubescent +
not absent +
cauline +  and basal +
5-veined +, 7-13-veined +  and 1-3-veined +
3-awned +  and bilobed +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
sometimes longer +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
membranous +
membranous +
inconspicuous +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
concealed +  and prominent +
4 +  and 6 +
2 +  and 1 +
dry +  and fleshy +
spikelike +
9.2 cm92 mm <br />0.092 m <br /> (?) +
elongate +
flabellate +
membranous +
pubescent +  and glabrous +
sessile +  and subsessile +
green +  and dark purple +
20 +  and 50 +
pectinate +
1 (?) +  and 3 (?) +
compound +  and simple +
2 (?) +  and 3 (?) +
Bouteloua hirsuta var. glandulosa +  and Bouteloua glandulosa +
Bouteloua hirsuta subsp. hirsuta +
Bouteloua hirsuta +
subspecies +
membranous +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
7 +  and 13 +
extended +
plant +  and cespitose +
aquatic +  and terrestrial +