Andropogon gyrans |
Andropogon tracyi |
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Elliott's bluestem |
Tracy's bluestem |
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Habit | Plants cespitose, cylindrical to ovate above. | Plants cespitose, upper portion dense, cylindrical. | ||||
Culms | 30-100 (140) cm; internodes usually glaucous; branches mostly erect, straight. |
50-120 cm; internodes not glaucous; branches mostly erect, straight. |
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Sheaths | smooth; ligules 0.3-1.5 mm, sometimes ciliate, cilia to 0.7 mm; blades 6-48 cm long, 0.8-5 mm wide, glabrous or densely pubescent with spreading hairs. |
smooth; ligules 0.2-0.5 mm, ciliate, cilia 0.2-0.8 mm; blades 10-22 cm long, 1.2-2.6 mm wide, glabrous or sparsely pubescent, with spreading hairs. |
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Inflorescence units | 2-31 per culm; subtending sheaths (2.6)4.1-4.5(13.5) cm long, (1.5)2.7-4.7(8) mm wide; peduncles (1)5-31(195) mm, with 2-5 rames; rames (1.5)2.8-4.2(6) cm, exserted or not at maturity, pubescence increasing in density distally within each internode. |
3-11 per culm; subtending sheaths (2.8)4.1-5.8(7.2) cm long, (3)4-4.7(5.8) mm wide; peduncles (9)14-31(65) mm, with 2 rames; rames (1.5)2.4-3.6(4.2) cm, usually exserted at maturity, pubescence increasing in density distally within each internode. |
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Sessile | spikelets (3)3.9-4.7(5.7) mm; callus hairs 1-5 mm; keels of lower glumes scabrous only beyond midlength; awns 8-24 mm; anthers 1, 0.6-1.4(1.7) mm, yellow or purple. |
spikelets (4)4.8-5(5.5) mm; callus hairs 1.5-3.5 mm; keels of lower glumes scabrous only above the midpoint; awns 11-23 mm; anthers 1, 1.2-2 mm, yellow. |
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Pedicellate | spikelets vestigial or absent. |
spikelets vestigial or absent. |
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2n | = 20. |
= 20. |
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Andropogon gyrans |
Andropogon tracyi |
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Distribution |
AL; AR; DC; DE; FL; GA; IL; IN; KY; LA; MD; MO; MS; NC; NJ; OH; OK; PA; SC; TN; TX; VA; WV
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AL; FL; GA; MS; NC; SC
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Discussion | Andropogon gyrans extends from the southeastern United States to the Caribbean and Central America. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Andropogon tracyi grows on sandhills, sandy pinelands, and scrublands of the southeastern United States. It resembles A. longiberbis, but usually differs in having sparsely pubescent blades and a more slender appearance. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 25, p. 657. | FNA vol. 25, p. 659. | ||||
Parent taxa | Poaceae > subfam. Panicoideae > tribe Andropogoneae > Andropogon > sect. Leptopogon | Poaceae > subfam. Panicoideae > tribe Andropogoneae > Andropogon > sect. Leptopogon | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | A. subtenuis, A. elliottii var. projectus, A. elliottii | |||||
Name authority | Ashe | Nash | ||||
Web links |