TRIANDRIA.— DIGYNIA. 



high ; pan. loose ; fi. brownish, hairy at base ; awn 

 contorted. 

 2. A. pennsylvanicum : panicle attenuated ; awn twict 

 as long as the florets ; seed villous. 

 HAB. Fields and open woods. July. U. Culm smooth 

 branches of the pan. short ; awn genie. 



83. AVENA. Oat-grass. 

 A. prcecox : panicle in a dense raceme ; florets i\s 



long as the calyx ; awn exserted ; leaves setaceous. 

 HAB. Sandy fields. June. 0. Cespitose, 3 — 4 in. 



high ; sheaths angular ; pan. oblong ; spik. 2-fi. . 



cal. longer than the fi. 



84. AIR A. Hair-grass. 



1. A. Jlexuosa : panicle spreading, trichotomous . 



branches flexuous ; calyx a little shorter than the 

 florets, and about the length of the awn ; leaves 

 setaceous ; culm nearly naked. 

 HAB. Rocky hills. June. U. Culm 1J— 2 ft. high ; 

 leav. mostly rad. ; pan. capill. ; cor. hairy at base. 



2. A. cespitosa: panicle diffuse ; florets about the length 



of the calyx ; awn short, straight ; leaves flat. 

 HAB. Swamps. June. U . Culm cespit., 18 in. 

 high ; leav. very narrow ; pan. capill. ; cal. blueish, 



3. A. arisiulata: panicle capillary, spreading; branches 



verticillate and flexuous ; calyx 2-flowered, shorter 

 than the florets ; superior floret pedicellate ; infe- 

 rior valve of the corolla truncate, laciniate, with an 

 awn a little below the middle scarcely exserted. 

 I. A. pumila : panicle small, fasthiiate, few-flowered •. 

 pedicels short ; florets awnless, obtuse, twice the 

 length of the calyx ; valves with membranaceous 

 margins ; leaves flat, smooth ; culm erect, scarcely 

 longer than the leaves. 

 HAB. In barren clayey soil. June. ty. An inch 

 high, growing in tufts. 



85. LOLIUM. Darnel. 



h L. perenne: florets much longer than the calyx, un- 

 armed, linear-oblong, compressed ; root perennial. 

 HAB. Meadows and road-sides. M,ay— June, U 



