Bothriochloa springfieldii
Bothriochloa wrightii
Springfield bluestem, Springfield's beardgrass
Wright's beardgrass, Wright's bluestem
30-80 cm, erect, unbranched;
nodes prominently bearded, hairs 3-7 mm, spreading, silvery-white.
to 70 cm, erect, sparingly branched;
nodes glabrous or hirsute, hairs about 1 mm.
mostly basal;
ligules 1-2.5 mm;
blades 5-30 cm long, 2-3(5) mm wide, flat to folded, glabrous or sparsely hispid adaxially, pilose near the throat.
cauline, glaucous;
ligules 1-2 mm;
blades 15-25 cm long, 3-7 mm wide, glabrous.
4-9 cm, oblong to fan-shaped;
rachises 1-5 cm, with 2-9 branches;
branches 4-8 cm, longer than the rachises, with 1(2) rames;
rame internodes with a membranous groove wider than the margins, margins densely white-villous, hairs 5-10 mm, obscuring the sessile spikelets.
5-6 cm, oblong to fan-shaped;
rachises 1-3 cm, with 4-5 branches;
branches 4-6 cm, lacking axillary pulvini, with 1 rame;
rame internodes with stiff, 1-3 mm marginal hairs.
spikelets 5.5-8.5 mm, lanceolate;
lower glumes densely short-pilose on the lower M, sometimes with a dorsal pit;
awns 18-26 mm;
anthers 1-1.5 mm.
spikelets 5.5-7 mm, lanceolate-elliptic;
lower glumes glabrous, usually without a dorsal pit;
awns 10-15 mm, twisted, once-geniculate;
anthers about 3 mm.
spikelets 3.5-5.5 mm, sterile.
spikelets staminate, subequal to the sessile spikelets.
= 120.
= 120.
Bothriochloa springfieldii
Bothriochloa wrightii
Bothriochloa springfieldii grows in rocky uplands, ravines, plains, sandy areas, and roadsides, from southern Utah to western Texas and Mexico at 900-2500 m. and, as a disjunct in northwest Louisiana. It differs from B. barbinodis in its less robust habit, narrower blades, longer nodal hairs, and fewer, more hairy panicle branches, and from B. edwardsiana in its pubescent nodes and wider, non-ciliate leaf blades.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Bothriochloa wrightii grows in rocky grasslands and shrubby slopes of the pine-oak woodlands of southern Arizona, New Mexico, Texas, and northern Mexico, at 1200-1800 m. It was last collected in the United States in 1930. It differs from B. barbinodis in its glaucous foliage, short, fan-shaped panicles, and large, pedicellate spikelets.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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