Andropogon hallii

Hack.
Common names: Sand bluestem
Synonyms: Andropogon gerardii var. paucipilus Andropogon gerardii var. chrysocomus
Treatment appears in FNA Volume 25. Treatment on page 653.

Plants strongly rhizomatous, rhizome internodes often longer than 2 cm. Culms (40) 60-150 (200) cm, strongly glaucous. Ligules (0.9) 2.5-4.5 mm, ciliate; blades 3-40 (51) cm long, (1.5) 2-10 mm wide, often pilose, at least near the collar. Inflorescence units usually only terminal; peduncles with 2-7 rames; rames 4-7 (9) cm, exserted at maturity; internodes usually densely pubescent, hairs 3.7-6.6 mm, often strongly yellowish. Sessile spikelets (5) 6.5-12 mm; lower glumes often ciliate; awns absent or to 11 mm; anthers 3, (2.3) 4-6 mm. Pedicellate spikelets 3.5-12 mm, usually well-developed and staminate. 2n = 60 (usually), 70, 100.

Distribution

Colo., N.Mex., Tex., Utah, Minn., Kans., N.Dak., Nebr., Okla., S.Dak., Mont., Ill., Ind., Iowa, Ariz., Wyo., Man., Sask.

Discussion

Andropogon hallii grows on sandhills and in sandy soil. Its range extends through the central plains into northern Mexico. It is similar to A. gerardii, differing primarily in its rhizomatous habit, more densely pubescent rames and pedicels, and greater drought tolerance. Andropogon hallii and A. gerardii are sympatric in some locations. The two species can hybridize and are sometimes treated as conspecific subspecies.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Andropogon hallii"
100 +, 70 +  and 60 +
2.3 cm23 mm <br />0.023 m <br /> (?) +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
anatomy +  and kranz +
Christopher S. Campbell +
1 (?) +  and 3 (?) +
terete +  and flattened +
slender +
keeled +  and rounded +
pseudopetiolate +  and branching +
divergent +  and parallel +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
pseudopetiolate +
non-radiate +  and radiate +
well-developed +
3 cm30 mm <br />0.03 m <br /> (40 cm400 mm <br />0.4 m <br />) +
convolute +, folded +, flat +  and linear +
reduced +
0.2 cm2 mm <br />0.002 m <br /> (1 cm10 mm <br />0.01 m <br />) +
spikelike +
Sand bluestem +
much-branched +
purple +  and reddish +
60 cm600 mm <br />0.6 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
not woody +
Colo. +, N.Mex. +, Tex. +, Utah +, Minn. +, Kans. +, N.Dak. +, Nebr. +, Okla. +, S.Dak. +, Mont. +, Ill. +, Ind. +, Iowa +, Ariz. +, Wyo. +, Man. +  and Sask. +
capillary +
sometimes longer +
concealing +
compressed +  and terete +
shorter or longer +
subtending +
compressed +  and rounded +
unequal +
uncinate +
0.37 cm3.7 mm <br />0.0037 m <br /> (0.66 cm6.6 mm <br />0.0066 m <br />) +
bracteate +  and ebracteate +
pedunculate +  and multiple-stalked +
fimbriate +  and cupulate +
solid +  and hollow +
photosynthetic +
not aromatic +
coriaceous +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
membranous +
inconspicuous +
2-9-veined +  and veined +
concave +, flat +  and 2-keeled +
complex +  and simple +
concealed +  and prominent +
sessile-pedicellate +
heterogamous +
not fused +
3 cm30 mm <br />0.03 m <br /> (?) +
9 cm90 mm <br />0.09 m <br /> (?) +
4 cm40 mm <br />0.04 m <br /> (?) +  and 7 cm70 mm <br />0.07 m <br /> (?) +
dry +  and fleshy +
elongate +
staminate +, pedicellate +  and sessile +
in triplets +  and paired +
well-developed +
usually smaller +  and reduced +
0.35 cm3.5 mm <br />0.0035 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
1 +  and 3 +
fused +  and free +
2 +  and 3 +
dome--shaped +  and triangular +
Andropogon gerardii var. paucipilus +  and Andropogon gerardii var. chrysocomus +
Andropogon hallii +
Andropogon sect. Andropogon +
species +
membranous +
sessile-pedicellate +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +