Bouteloua hirsuta subsp. pectinata

(Feath.) Wipff & S.D. Jones
Common names: Tall grama
Synonyms: Bouteloua pectinata
Treatment appears in FNA Volume 25. Treatment on page 262.

Plants without rhizomes or stolons. Culms 35-75 cm, erect, densely tufted, usually unbranched; nodes 3-4; internodes glabrous. Leaves mostly basal; sheaths mostly pubescent. Panicles racemose, with (2) 3-6 branches on (3) 6-18 cm rachises. Anthers 2-3.2 mm; rachilla segments subtending second florets with a distal tuft of hairs. Caryopses 1.5-2.6 mm. 2n = 20.

Discussion

Bouteloua hirsuta subsp. pectinata grows in well-drained, relatively undisturbed, calcareous soils, usually on thin-soiled limestone outcrops, at 60-500 m. Its range extends from southern Oklahoma to central Texas. Although restricted in its geographic distribution, where subsp. pectinata is sympatric with subsp. hirsuta, swarms of morphologically intermediate plants are found (Wipff and Jones 1996).

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

yellow +  and cream +
1 +  and 3 +
0.2 cm2 mm <br />0.002 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
J.K. Wipff +
(Feath.) Wipff & S.D. Jones +
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 +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.26 cm2.6 mm <br />0.0026 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 +
Tall grama +
35 cm350 mm <br />0.35 m <br /> (75 cm750 mm <br />0.75 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 +
papillose-based +
uncinate +
paniculate +  and racemose +
hollow +  and solid +
not absent +
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 +
3 +  and 4 +
2 +  and 1 +
dry +  and fleshy +
spikelike +
3 cm30 mm <br />0.03 m <br /> (?) +
elongate +
flabellate +
membranous +
sessile +  and subsessile +
green +  and dark purple +
20 +  and 50 +
pectinate +
1 (?) +  and 3 (?) +
compound +  and simple +
2 (?) +  and 3 (?) +
Bouteloua pectinata +
Bouteloua hirsuta subsp. pectinata +
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 +
aquatic +  and terrestrial +