C02 GRAMINK.E. (OKASS FAMILY.) 



8. A. oligantha, Miihx. Culms 1°- 2' liijjh, brancheil, slender; leaves 

 cohVdliut' ; si)iki]ils .statifieii, single or Ity piiirs, in a sinijilu terminal raieme ; 

 glumes nearly equal, I'-l'long; miiltile awn I' -2' lung, rather longer than 

 the lateral ones, circular-ciuved at the liase. — Souili Carolina, an<l westward, 

 rare. Sept. 



9. A. purpurascens, I'oir. Cnlmsbranriiingat the l)ase, l''-2°high; 

 leaves Hat, glalauiis, like the sheaths ; paniele 1°- U^ long, the branches short 

 and erect ; ein])ty glumes uneijual, the lower 5" long, tin; ujijier sliurter and 

 etiualliug tiie Horet; middle awu 1' long, spreading. — Dry sterile soil, com- 

 mon. August. 



10. A. lanata, Poir. Much like the last, but larger (2°-4°higli); leaves 

 scabrous on tiiu upper surface, tiie sheaths woolly ; branches of tiie jtanide 

 longer, aud often spreading. — Witli tlie jircceding, but less common. July- 

 August. 



11. A. palustris, Vasey. Culms 3° -4° high, simple or branching; 

 leaves Hat, glabrous ; panicle long ( 1^°- 2°) and narrow, purple ; emjity glumes 

 i' loug, nearly equal ; awns 10"- 16" long, the middle oue spreading. (A. vir- 

 gata, var. Flora.) — In and around siiallow pine barren ponds, West Florida. 

 August - Sept. 



12. A. virgata, Trin. Culms sirajile, 2°-4° iiigh ; leaves flat, soon con- 

 volute; panicle loosely or densely brauclied, l°- l^.°long; empty glumes eijual, 

 or the lower shorter, 4" long; awns sjireading, 6" long. (A. coudensata. 

 Flora.) — Barren sandy soil, near the coast, Florida to North Carolina. 

 August - Sept. 



13. A. Striota, Michx. Culms (2°-3° high) tufted, simple, straight; 

 leaves chiefly radical, filiform, involute, rigid, hairy at the base; panicle (1° 

 long) spiked ; glumes short-awned ; lateral aw-ns as long as tlie floret, the mid- 

 dle oue one third longer. — Wet or dry pine barrens, very common. June- 



July. 



■M- -t-H A>c7is united above the (jlume. 



14. A. spiciformis, Fll. Glabrous; culms 1°- 2° high, simple ; leaves 

 erect, convolute filiform ; panicle closely spiked, 3' -5' long; empty glumes 

 long-awned, the u])))er twice as long as the lower one; awns united far above 

 the glume, the middle one 1' long, spreading. — Low pine barrens iu the lower 

 districts. August - Sept. 



§ 2. Annix united ahore the glume, and jointed with its summit. 

 1.5. A. tuberculosa, Nutt. Annual; culms rigid, branching (1°-U° 

 high) ; leaves flat; glumes nearly etjual, bristle-awned ; awns (2' long) equal, 

 tw^isteil below, then widely s])readiug. — Dry ridges iu the middle districts of 

 Georgia. Sept. — Panicle simple. 



38. MUHLENBERGIA, Schreb. Drop-seeb Grass. 



Spikelets 1-flowered. Glumes persistent, pointed or awiied, equal, or the 

 lower one smaller. Floret sessile iu the glumes, commonly hairy at the base, 

 deciduous with the enclosed grain, its glume 3-nerved and mucrouate or awued 

 at the apex. Stamens 3. 



