Andropogon tracyi

Nash
Common names: Tracy's bluestem
Treatment appears in FNA Volume 25. Treatment on page 659.
Revision as of 19:23, 24 September 2019 by FNA>Volume Importer

Plants cespitose, upper portion dense, cylindrical. Culms 50-120 cm; internodes not glaucous; branches mostly erect, straight. Sheaths 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. Inflorescence units 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. Sessile 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. Pedicellate spikelets vestigial or absent. 2n = 20.

Distribution

Ga., N.C., Ala., Miss., S.C., Fla.

Discussion

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.

Selected References

None.

Lower Taxa

None.