306 TRIANDRIA DIGYNIA. 



BAB. Dry hills and fields. August September. 7J. ; Culm genie , 

 flender ; panicles lateral and terminal ; calyx scarcely appaj ent. 



35. TRICHODIUM. 



T. laxjliorum: culm erect; leaves setaceous, and with the sheaths 



somewhat scabrous; panicle diffuse, capillary, with trichotomous 



branches ; calyx unequal. 

 HAB. Dry swamps and fields. May June. Tj.; A foot and a half 



high, Jilif. ; panicles at length piramidal, purplish. 

 T. scabrum : culm geniculate at the base, assurgent, branched ; leaves 



linear-lanceolate, flat, striate, scabrous ; sheaths mostly smooth ; 



panicles verticillate and divaricate; calyx unequal; corolla ovate, 



acute, 3-nerved. 

 HAB. Dry woods. August September. 7J.; 1218 inches high; 



leaves broad, pale green ; panicles concealed at the base. 



36. AGROSTIS. Meadow-grass. 



A. vulgar is : branches of the panicle smoothish, at length divaricate ; 

 inferior valve of the corolla 3-nerved; stipule, very short and 

 truncate. 



HAB. Meadows and pastures. June August. Tj.; Root creeping; 

 culm 12 18 inches high ; panicles capillary ; flower purple. 



A. alba : branches of the panicle hispid, spreading, loose ; inferior 

 valve of the corolla 5-nerved ; stipule oblong. 



HAB. Fields and pastures. June August, ip; Root creeping ; culm 

 assurgent, often sobolif. ; panicle capillary. 



A. lateriflora : culm erect, branched above, soboliferous at the base ; 

 panicles lateral and terminal, contracted, dense ; calyx acuminate ; 

 corolla shorter than the calyx, equal, pubescent at the base, awn- 

 less. 



HAB. Swamps and wet meadows. August September. 7J.; Root 

 creeping ; culm 2 feet high, with swelling nodes ; panicles spike- 

 form. 



A. virginica: culms numerous, procumbent at the base, assurgent; 

 leaves subdistichous, involute, rigid; panicles lateral and terminal, 

 spike-form ; the lateral ones concealed ; calyx equal, about as long as 

 the corolla. 



HAB. Sandy soils. September October. <v) ? A foot high; leaves 

 hairy at base ; sheaths swelled ; stip. 0; anther purple. 



37. CINNA. 



C. arundinacea: panicle large, capillary, loose; leaves broad-linear; 



culm smooth. 

 HAB. Swamps and wet woods. Aug. Sept. 9J. ; Culm 2 5 feet 



high ; leaves pale green ; flower green. 



38. POLYPOGON. 



P. racemose: panicle dense, conglomerate, interrupted; bristles of 



the calyA scabrous; corolla unarmed, hairy at the base; culm 



branched. 

 HAB. Bog-meadows. August September. QJ.; Culm 3 4 feet 



high, compressed; branches oppressed; leaves fiat; panicles two 



inches long. 



