\ 



TRIANDRIA DIGYNIA. 



15t 



\ 

 \ 



mle floret as long as tlie hermapluiulitc flower, ciliate. Valve^ of the 

 fifl/y.r unequal; the exterior loudest, mucronate ; both sharply serru** 

 late along the margins. Corolla shorter than the calyx, unavvned. 



Grows in the mountains of Carolina, Dr. Macbride. 

 . Flowers October. Digitate Jlndropogon* 



4 



* 



AIRA. 



Calyx 2 valve d, 2 How, 



ered. 



FloreU without an 



intfiposed rudiment. 

 * Awned. 



Calyx S-valvis, 2-flo- 

 rus. Flosculi absque in- 

 interjecto rudimento. 



* Aristatce. 



4. Fallens. Var. aristata. Mil hi. Cat. 



A. foliis planis ; panicu- ] Leaves flat ; panicle dif- 

 lalaxa; subvert idliuta ; fuse, somewhat verliciU 

 calycibus 2-valvibus, 3- late ; calyx 3 or 3 flower- 



% 



floris; floreinferioremu- ed ; the lower flower un- 

 tico, superiorilius arista | awned ; the upper with a 



brevi contorta. 



Avena Palustris, 



E. 



short twisted awii. 



Mich. 1. p. 72. 



A. Caroliniana? Walt. p. 81. 



^oof perennial. Stem I — 2 feet high, erect, slightly geniculate at 

 I'a^c, terete, glabrous, Leaves narrow, a little scabrous finely scnu- 

 '"te; sheaths open, glabrous, shorter than the joints ; stipules short, 

 lacerate. Cahjx 2 valved, valves compressed, keeled, very acute, keels 

 serrulate, the interior valve a little longer. CoroUn 2 valved ; the ex- 



7' u^^^^ similar to the calyx ; the interior only half as long, obtuse, 

 ^ith the back impressed; to the back of the exterior valve of the up- 

 ^r flowers, is attached a short contorted awn. Mthers yellowish, 

 ^"^rtas white. 



i^^v' ^*^'?cture of tlic flower of this plant appears evidently that of 

 «»a Aira; its awn has caused it to be referred to Avena. 



^rows in rich wet soils 



'lowers March 



•April. 



•in nver swamps common 



2. Flexuosa. 



A. panicula patente, 



oma ; pedunculis ] chotonious ; peduncles 



triehot 



j" xuosis ; aristis genicu- 



''^^^s ; foHis setaceis ; cul- 



Panicle expanding, tri- 



flexuous 



awns 



genicu- 



^no subnudo. 



P- 378. 



late ; leaves setaceous 



Sp. pi. 1. stem nearly naked. 



9 



J*"rsh, Fior, Amer. Sept, 1 . p. 77 



