Andropogon hallii

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

References

None.

Lower Taxa

No lower taxa listed.