GRAMINEAE 27 



Annual plants. i. S. vaginaejlorus. 



Perennial plants. 

 Flowering scale appressed-pubescent below with long hairs. 



2. S. asper. 

 Flowering scale glabrous. 3. S. longifolius. 



b. Upper leaf-sheaths not enclosing panicles. 



Panicle usually loose and open, its branches spreading or ascending, or if 



erect the panicle not elongated. 4. S. heterolepis. 



Panicle narrow and elongated, spike-like. 5. 5". Indicus. 



B. IrCaf-sheaths with a tuft of long spreading hairs on each side of the apex. 



6. 5. cryptandrus. 



1. Sporobolu8vaglnaeflorus(Torr. ) Wood. Sheathed Rush-grass. 

 (Man. p. 105 ; I. F. /. 344.) In dry soil, N. Y. to Mo., Ga. and Tex. 

 — Pennsylvania : Delaware ; Chester ; Bucks ; Northampton ; 

 Franklin ; Huntingdon ; Philadelphia ; Allegheny. 



2. Sporobolus asper ( Michx. ) Kunth. Rough Rush-grass. (Man. 

 p. 104; I. V. /.J41.) In dry soil, Del. to 111., Fla. and Tex. — Pennsyl- 

 vania : Lancaster. 



3. Sporobolus longifolius (Torn ) Wood. Long-leaved Rush-grass. 

 (Man. p. 105 ; I. F. /. 342.) In dry soil. Me. to Kans., Fla. and Tex. — 

 Pennsylvania : Northampton ; Bucks ; Montgomery ; Lancaster ; 

 Dauphin. 



4. Sporobolus heterolepis A. Gray. Northern Dropseed. (Man. 

 p. 106; I. v./. JS4-) In dry soil, Quebec to Assiniboia, Pa., 111. and 

 Ark. — Pennsylvania : Lancaster, New Texas. 



5. Sporobolus Indicus (L.) R. Br. India Rush-grass. (Man. p. 

 106 ; I. F. /. 349. ) In meadows and waste places, Va. to Fla., Ark. and 

 Cal, Nat. from tropical regions of Am. — Pennsylvania : Philadelphia, 

 on and near ballast. 



6. Sporobolus cryptandrus (Torr. ) A. Gray. Sand DropsEED. 

 (Man. p. 106; I. F. /'. J5J.) In sandy soil, coast of N. Eng., along all 

 the Great Lakes, west to N. Dak. south to Tex. and Mex. — Pennsylvania : 

 Erie, Presque Isle. 



27. POLYPOGON Desf. 



1. Polypogon MonspeUensis (L.) Desf. Beard-grass. (Man. p. 

 108; I. F. /. 3SS.) In waste places, N. H. to S. C, mostly near the 

 coast. Very abundant in western N. A., from B. C. to Mex. Nat. from 

 Eu. — Pennsylvania : Philadelphia, mainly on ballast ; Bucks. 



28. CINNA L. 



Panicle contracted at maturity, its filiform branches erect, or drooping : 

 spikelets 4-5 mm. long, the first scale much shorter than the second. 



I. C. arufidinacea. 



Panicle open, its capillary branches flexuous and drooping : spikelets 3 mm. 

 long, the first scale about equalling the second. 2. C. lalifolia, 



1. Cinna arundinacea L. Wood Reed-grass. (Man. p. 108; I. F. 

 /. 360.) In moist woods and shaded swamps, Newf. to the N. W, 



