Bouteloua aristidoides

(Kunth) Griseb.
Treatment appears in FNA Volume 25. Treatment on page 255.

Plants annual; tufted. Culms 4-60 cm, outer culms of a tuft decumbent, sometimes geniculate, branched at the lower nodes. Ligules 0.2-0.5 mm, membranous, lacerate or ciliate; blades 2-5 (9) cm long, 0.7-2 mm wide, flat or folded, adaxial surfaces sometimes with papillose-based hairs, margins usually with papillose-based hairs near the ligules. Panicles 2.5-10.5 cm, with (1) 4-15 branches; branches 5-45 mm, deciduous, densely pubescent (at least basally), with 2-10 spikelets per branch, axes extending 2-10 mm beyond the base of the terminal spikelets, apices entire; disarticulation at the base of the branches, the break forming a sharp tip. Spikelets appressed. Proximal spikelet on each branch with 1 floret; lower glumes 1.5-3.5 mm, glabrous, narrow to subulate; upper glumes 5.5-6.2 mm, densely pubescent, at least on the basal 1/2; lemmas 5.8-6 mm, acuminate, unawned; lowest paleas almost as long as the lemmas, bifid, glabrous; rachillas prolonged beyond the florets for about 0.5 mm. Distal spikelets with 1 bisexual and 1 rudimentary floret, glumes unequal, glabrous, minutely scabrous on the keels; narrowly acute or acuminate; lower glumes 1.5-2 mm; upper glumes 5-6 mm, glabrous or sparsely pubescent basally, often divergent; lowest lemmas 6-8 mm, veins pubescent, lateral-veins excurrent as short (to 1 mm) awns, acuminate, midvein extended into a setaceous tip or a short awn; lowest paleas 5-7 mm, bifid, veins often excurrent as short awns; anthers about 2.5 mm, yellow or yellow and red; distal florets reduced to a pubescent, 3-awned, awn column, awns 2-7 mm, exserted. Caryopses 2.5-3 mm. 2n = 40.

Distribution

Md., N.Mex., Tex., Utah, Calif., Ariz., Nev.

Discussion

There are two varieties, both of which grow in the Flora region.

Selected References

None.

Key

1 Panicle branches with 2-5 spikelets, usually 5-16 mm to the base of the terminal spikelets, axes usually extending an additional 6-10 mm Bouteloua aristidoides var. aristidoides
1 Panicle branches with 6-10 spikelets, usually 15-35 mm to the base of the terminal spikelets, axes extending an additional 2-5(7) mm Bouteloua aristidoides var. arizonica

"decumbent" is not a number.

... more about "Bouteloua aristidoides"
yellow and red +  and yellow +
1 +  and 3 +
2.5 cm25 mm <br />0.025 m <br /> (?) +
J.K. Wipff +
(Kunth) Griseb. +
1 (?) +  and 3 (?) +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
well-developed +
keeled +  and rounded +
pseudopetiolate +  and branching +
not fused +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
not pseudopetiolate +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
pubescent +  and glabrous +
folded +  and flat +
0.7mm;2mm +
subdigitate +  and digitate +
75 cm750 mm <br />0.75 m <br /> (?) +
spikelike +
not woody +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
triangular +  and dome--shaped +
sometimes longer +
membranous +
ascending +  and erect +
4 cm40 mm <br />0.04 m <br /> (60 cm600 mm <br />0.6 m <br />) +
not woody +
Md. +, N.Mex. +, Tex. +, Utah +, Calif. +, Ariz. +  and Nev. +
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 +
unequal +
papillose-based +
uncinate +
paniculate +  and racemose +
hollow +  and solid +
not absent +
5-veined +, 7-13-veined +  and 1-3-veined +
acuminate +
0.58 cm5.8 mm <br />0.0058 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
sometimes longer +
ciliate +  and lacerate +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
membranous +
inconspicuous +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
extended +
concealed +  and prominent +
2 +  and 1 +
2.5 cm25 mm <br />0.025 m <br /> (10.5 cm105 mm <br />0.105 m <br />) +
dry +  and fleshy +
spikelike +
elongate +
flabellate +
sessile +  and subsessile +
2 +  and 10 +
terete +, compressed +  and pectinate +
1 (?) +  and 3 (?) +
compound +  and simple +
2 (?) +  and 3 (?) +
Gramineae +
Bouteloua aristidoides +
Bouteloua subg. Bouteloua +
species +
setaceous +  and sharp +
membranous +
pubescent +  and glabrous +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
7 +  and 13 +
extended +
rhizomatous +  and stoloniferous +
aquatic +  and terrestrial +