AOHOSTIDK.K. 201 



ter 3-8 cm. long, tlie terniiiiul one sometimes 10-12 cm. long; 

 lower ra3's iu twos or threes, the upper single. Spikelets with un- 

 equal 1-nerved glumes, first 5-10 mm. long, second 8-13 mm. long, 

 the awns very short; floret spotted, 8-9 mm. long; lateral awns 

 spirally twisted below when mature and dry, 7-12 mm. long, the 

 central one a third longer. 



!N early related to A. dichotoma Michx. 



Illinois, Patterson for U. S. Dept. Agricul. 232; Minnesota, 

 Holzinger 24. 



Illinois to ^Minnesota. 



13. A. Floridana (Chapm.) Vasey, Gram. U. S. 21 (1883). 

 Strejdacline Floridana Chapm. Fl. S. States, 554 (18G0). 



Culms simple, erect, slender, 60 cm. high. Sheaths hairy at 

 the throat; blades smooth, filiform, 15-25 cm. long. Panicle erect, 

 narrow, slender, 30 cm. long; rays mostly in pairs. Spikelets on 

 short pedicels, first glume 12-13 mm. long, second 7-9 mm. long, 

 obtuse or bifid, with a very short beak ; floret 8 mm. long; bent 

 aAvn 1-2 cm. long. 



South Florida, Blodgctt. 



14. A. purpurascens Poir. Encyc. Suppl. 1 : 452 (1810). Chm- 

 taria affinis P. & S. Syst. 2: Mant. 210 ( ). 



An erect glabrous perennial, 60-120 cm. high. Sheaths some- 

 times downy, longer than the internodes; ligule very short; blades 

 about 5 to a culm. 20-30 cm. long, the lower portions tardily invo- 

 lute. Panicle exserted. purple and brown, slender, 20-40 cm. long; 

 rays solitary, in pairs or rarely in threes. Empty glumes each with 

 1 scabrous nerve, and a very short awn, first 12 mm. long, second 

 about 10 mm. long; floret often spotted, 5-7 mm. long, the lateral 

 divergent awns 2 cm. long, the central one longer. 



New Jersey, Scribner iox U. S. Dept. Agricul. 250; Michigan, 

 Clark 2020. 



New England and Michigan to Texas; also West Indies. 



Var. depauperata Vasey, ined. Panicle slender; first and sec- 

 ond glumes 7 and 5 mm. long, ies})ectively ; floret 4 mm. long. 



Mississippi, Tracij. 



Var. minor Vasey, Contrib. U. S. Xat. Herb. 3:46 (1892). 



