Andropogon gerardii

Vitman
Common names: Big bluestem Barbon de gerard
Synonyms: Andropogon provincialis Andropogon furcatus
Treatment appears in FNA Volume 25. Treatment on page 653.

Plants often forming large clumps, rhizomes, if present, with internodes shorter than 2 cm. Culms 1-3 m, often glaucous. Sheaths glabrous or pilose; ligules 0.4-2.5 mm; blades 5-50 cm long, (2) 5-10 mm wide, usually pilose adaxially, at least near the collar. Inflorescence units usually only terminal; peduncles with 2-6 (10) rames; rames 5-11 cm, exserted at maturity, usually purplish, sometimes yellowish; internodes sparsely to densely pubescent, hairs 2.2-4.2 mm, usually white, rarely yellowish. Sessile spikelets 5-11 mm, scabrous; awns 8-25 mm; anthers 3, 2.5-4.5 mm. Pedicellate spikelets 3.5-12 mm, usually well-developed and staminate. 2n = 20, 40, 60 (usually), 70, 80.

Distribution

Conn., N.J., N.Y., Wis., Del., D.C., Man., Ont., Que., Sask., W.Va., Colo., Fla., Wyo., N.H., N.Mex., Tex., La., Tenn., N.C., S.C., Pa., Va., Mass., Maine, R.I., Vt., Kans., N.Dak., Nebr., Okla., Ala., Ark., Ill., Ga., Ind., Iowa, Ariz., Md., Ohio, Utah, Mo., Minn., Mich., Mont., Miss., Ky., S.Dak.

Discussion

Andropogon gerardii grows in prairies, meadows, and generally dry soils. It is a widespread species, extending from southern Canada to Mexico, and was once dominant over much of its range. It is frequently planted for erosion control, restoration, or as an ornamental; the records from Washington and central Montana reflect such plantings. It hybridizes with A. ballii, the two sometimes being treated as conspecific subspecies.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number."elongated" is not a number.

... more about "Andropogon gerardii"
80 +, 70 +, 60 +, 40 +  and 20 +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
anatomy +  and kranz +
Christopher S. Campbell +
Vitman +
1 (?) +  and 3 (?) +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
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 +
5 cm50 mm <br />0.05 m <br /> (50 cm500 mm <br />0.5 m <br />) +
convolute +, folded +, flat +  and linear +
reduced +
5mm;10mm +
spikelike +
Big bluestem +  and Barbon de gerard +
much-branched +
purple +  and reddish +
100 cm1,000 mm <br />1 m <br /> (300 cm3,000 mm <br />3 m <br />) +
not woody +
Conn. +, N.J. +, N.Y. +, Wis. +, Del. +, D.C. +, Man. +, Ont. +, Que. +, Sask. +, W.Va. +, Colo. +, Fla. +, Wyo. +, N.H. +, N.Mex. +, Tex. +, La. +, Tenn. +, N.C. +, S.C. +, Pa. +, Va. +, Mass. +, Maine +, R.I. +, Vt. +, Kans. +, N.Dak. +, Nebr. +, Okla. +, Ala. +, Ark. +, Ill. +, Ga. +, Ind. +, Iowa +, Ariz. +, Md. +, Ohio +, Utah +, Mo. +, Minn. +, Mich. +, Mont. +, Miss. +, Ky. +  and S.Dak. +
capillary +
sometimes longer +
concealing +
compressed +  and terete +
shorter or longer +
subtending +
compressed +  and rounded +
unequal +
yellowish +  and white +
uncinate +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.42 cm4.2 mm <br />0.0042 m <br />) +
bracteate +  and ebracteate +
pedunculate +  and multiple-stalked +
fimbriate +  and cupulate +
solid +  and hollow +
2 cm20 mm <br />0.02 m <br /> (?) +
photosynthetic +
not aromatic +
coriaceous +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 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 /> (?) +
yellowish +  and purplish +
5 cm50 mm <br />0.05 m <br /> (?) +  and 11 cm110 mm <br />0.11 m <br /> (?) +
dry +  and fleshy +
elongate +
pilose +  and glabrous +
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 provincialis +  and Andropogon furcatus +
Andropogon gerardii +
Andropogon sect. Andropogon +
species +
membranous +
sessile-pedicellate +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +