I3 6 GRAMINEAE. 



9. Aristida stricta Michx. Erect Aristida. (Fig. 305.) 



Aristida stricta Michx. Fl. Bor. Am. i: 41. 1803. 



Culms 2-4 tall, erect, simple, smooth and glab- 

 rous. Sheaths shorter than the internodes, smooth, 

 glabrous or pubescent at the apex ; ligule short ; 

 leaves involute-filiform, the basal i or more in 

 length, those of the culm S'-ia'long, or the upper 

 shorter ; panicle spike-like, strict, or the top 

 sometimes nodding, 6'-2 long, its branches erect ; 

 outer scales of the spikelet awn-pointed, the first 

 i-nerved or occasionally with an obscure additional 

 nerve on each side, shorter than the second ; 

 third scale equalling the first or a little shorter; mid- 

 dle awn 5"-io" long, horizontal when old, the 

 lateral ones shorter, erect or divergent. 



Dry soil, Virginia (according to S. Watson), south to 

 Florida. July-Sept. 



10. Aristida dispersa Trin. & Rupr. Bushy Aristida. (Fig. 306.) 



Aristida Americana L,. Amoen. Acad. 5: 393. 1759? 

 Aristida JasciculafafoTT. Ann. Lye. X. Y. i: 154. 1824? 



Aristida dispersa Trin. & Rupr. Mem. Acad. St 

 Petersb. (VI.) 5: 129. 1842. 



Glabrous, culms i-2 tall, erect, slender, 

 branched, smooth, Sheaths shorter than the in- 

 ternodes , ligule short, ciliate ; leaves 2'-6 v long, 

 l // wide or less, flat, attenuate into a long point, 

 smooth or scabrous ; panicle 3 r -7' long, at first 

 strict, the branches finally more or less spreading ; 

 first scale of spikelet i-nerved, or occasionally with 

 an obscure additional nerve on each side, shorter 

 than the second scale; third scale equalling or longer 

 than the second ; awns divergent, the middle one 

 4//_S// long, the lateral ones shorter. 



i 



Dry soil, Kansas to Texas, Mexico, New Mexico 

 and California. Aug. -Sept. 



ii. Aristida tuberculosa Xutt. Sea-beach Aristida. (Fig. 307.) 



Arislida tnberctilosa Nutt. Gen. i: 57. 1818. 



Glabrous, culms 6 / -2 tall, erect, dichotomously 

 branched, smooth. Sheaths shorter than the in- 

 ternodes; ligule short, ciliate; leaves 5 '-9' long, 

 about i" wide, attenuate into a long slender point, 

 smooth beneath, scabrous above; panicle '-8' long, 

 branches slender, ascending; outer scales of the 

 spikelet about equal, awued, the third scale 

 shorter; awns divergent or reflexed, more or less 

 coiled, united at base into a column 3"-6" long 

 which is articulated to the scale. 



!, < >jx-cially on sea beaches. Ma>ai-husetts 

 t. Minnesota, south to Georgia, Also in the interior in 

 , Wisr.in-in ami Miinu-ota. Aug. -Sept. 



