Andropogon gerardii |
Andropogon virginicus |
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Barbon de Gerard, big bluestem |
broom sedge, broomsedge bluestem |
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Habit | Plants often forming large clumps, rhizomes, if present, with internodes shorter than 2 cm. | Plants cespitose, dense and cylindrical to obpyramidal above. | ||||||||
Culms | 1-3 m, often glaucous. |
40-210 cm; internodes glaucous or not; branches erect to ascending, usually straight, sometimes arching. |
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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. |
usually smooth, rarely somewhat scabrous; ligules 0.2-1 mm, ciliate, cilia 0.2-1.3 mm; blades 11-52 cm long, 1.7-6.5 mm wide, smooth and glabrous or sparsely to densely pubescent with spreading hairs. |
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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. |
6-195 per culm; subtending sheaths (2.1)3.1-4.6(6.7) cm long, (1.7)3-3.8(5.6) mm wide; peduncles usually (1)4-6(30) mm, with 2-7 rames; rames (0.5)1.7-2.8(4.4) cm, sometimes exerted at maturity, pubescence sparse basally and increasing in density distally within each internode. |
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Sessile | spikelets 5-11 mm, scabrous; awns 8-25 mm; anthers 3, 2.5-4.5 mm. |
spikelets (2.6)3.5-3.8(4.7) mm; callus hairs 1-3 mm; keels of lower glume usually smooth below midlength, scabrous distally; awns 6-21 mm; anthers 1(3), 0.6-1.5 mm, yellow or purple. |
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Pedicellate | spikelets 3.5-12 mm, usually well-developed and staminate. |
spikelets vestigial to absent. |
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2n | = 20, 40, 60 (usually), 70, 80. |
= 20. |
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Andropogon gerardii |
Andropogon virginicus |
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Distribution |
AL; AR; AZ; CO; CT; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; ND; NE; NH; NJ; NM; NY; OH; OK; PA; RI; SC; SD; TN; TX; UT; VA; VT; WI; WV; WY; MB; ON; QC; SK
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AL; AR; CA; CT; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; MI; MO; MS; NC; NJ; NY; OH; OK; PA; RI; SC; TN; TX; VA; WV; HI; PR; ON
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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. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Andropogon virginicus is native from the southeastern United States to northern South America, but has become established outide its native range in California, Hawaii, Japan, and Australia. Three varieties are recognized, two of which contain morphologically distinct variants. Andropogon virginicus hybridizes with A. glomeratus and A. longiberbis (Campbell 1986). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 25, p. 653. | FNA vol. 25, p. 659. | ||||||||
Parent taxa | Poaceae > subfam. Panicoideae > tribe Andropogoneae > Andropogon > sect. Andropogon | Poaceae > subfam. Panicoideae > tribe Andropogoneae > Andropogon > sect. Leptopogon | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | A. provincialis, A. furcatus | |||||||||
Name authority | Vitman | L. | ||||||||
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