GRAMINE^E. 419 



keeled, compressed. Scales 2. Stigmas very finely cut. 

 Seed loose. Triandria. Digynia. 



1. L. virginica IVilld. : panicle simple ; the lower brandies diffuse ; 

 flowers appressed, monandrous, sparingly ciliate on the keel. 



HAB. Wet woods. Can. to Car. Aug. If. Culm 24 feet 

 high, geniculate, erect or procumbent. Panicle terminal, much 

 exsert ; branches few and solitary. White Grass. 



2. L. oryzoides Swartz. : panicle diffuse, sheathed at the base ; flow- 

 ers triandrous, spreading ; keel of the glumes conspicuously ciliate. 



HAB. Ditches and swamps.. N. Y. to Car. Aug., Sept. If. 

 Culm 3 5 feet high, erect or procumbent at base. Panicle 

 much branched, spreading. White, Grass, 



56. ZIZANIA. Linn. 



Monoecious. Glume none. STERILE FL. mixed with the 

 fertile. Palea 2, subawned. FERTILE FL. Pajece 2, cu- 

 cullate and awned. Style 2-parted. Seed 1, enveloped in 

 the plaited paleae. Monoecia. Hexandria. 



1. Z, aquation Lamb. : panicle pyramidal, divaricate and sterile at the 

 base, spiked and fertile above ; pedicels of the flower clavate; awn 

 long ;' seed linear. Z. clavulosa Mich. 



HAB. In water. Can. to Flor. W. to Miss. Aug. 24!. Culm 

 4 6 feet high, jointed. Leaves broad-linear. Panicle a foot or 

 more in length, the lower branches spreading. 



Wild Rice. Water Oats. 



2. Z. miliaceu Mich. : panicle effuse, pyramidal ; glumes with short 

 awns ; sterile and fertile florets intermixed ;. style 1 ; seed ovate, 

 smooth ; leaves glaucous. 



HAB. In water. Penn. to Car. Aug. Z/. Culm erect, 6 10 

 feet high. Leaves very long, narrow. Flowers in a large termi- 

 nal pyramidal panicle. 



57. HYDROCHLOA. P.deBeauv. 



Monoecious. Glume none. STERILE FL. Palcce 2, awn- 

 less. FERTILE FL. Palece 2, awnless. Stigmas 2, very 

 long. Seed 1 , reniform. Monoecia. Hexandria. 



H.fiwtans P. de B. Zizania fluitans Mich. Pursh. 



HAB. In water. .Can. and N. S. July. U!. Floating. Culm 

 long, slender, branching. Leaves linear, flat. Spike solitary, 

 axillary, setaceous, about 4-flowered, 



58. OR.YZOPZIS. Mich. 



Glume 1-flowered, 2-valved ; valves membranaceous, near- 

 ly equal, loose, obovate, awnless. Palecc 2, coriaceous, ey- 



