304 



TRIANDR1A DIGYNIA. 



Spikes numerous. 



E. poi yst achy on : leaves flat, triquetrous at the extremity ; culm nearly 



terete ; spikes on scabrous peduncles, nodding. 

 HAB. Swamps. July, 7J.; culm 1 2 feet high, leafy ; leaves very 



long ; spik. 9 12, subterminate ; wool -white or reddish. 

 E. virginicum : culm nearly terete below, obtusely triangular above ; 



leaves flat, very long ; spikes clustered, erect, nearly sessile ; involu- 



crum 2 3-leaved. 



HAB. Swamps. July. Culm 2 4 feet high ; spikes ovate, some- 

 what umbelled ; wool reddish. 



b. gracile : culm very slender ; leaves almost filiform. 

 HAB. Cedar swamps. Aug. 

 E. angustifolium : culm somewhat triangular ; leaves channelled and 



triquetrous ; peduncles very smooth. 

 HAB. AVet meadows, 1|. ; afoot or more high ; leaves very narrow ' 



spikes 3 5 ; wool white. 



26. SPARTINA. Marsh-grass. 



S. cynosuroides : spikes numerous, (10 40,) pedunculate, panicled, 

 spreading ; leaves broad, flat, at length convolute ; calyx with a short 

 awn on one of the glumes ; style 2-cleft at the summit. 

 HAB. Salt marshes. Aug. ^ ; 4 9 feet high ; leaves 2 4 feet long ; 



Jl. closely imbricate ; style bifid. 

 8. juncea : leaves distichous, convolute, spreading ; spikes few, 1 3, 



pedunculate ; peduncles smooth ; corolla rather obtuse ; styles 2. 

 HAB. Sea coast, and salt marshes. July Aug. %; root creeping ; 

 culm 18 inches high, slender, rigid ; calyx very unequal ; anther 

 purple. 



S. glabra : leaves concave, erect ; spikes alternate, sessile, erect, ap- 

 pressed ; corolla nearly smooth on the keel ; style cleft about half way 

 down. 



HAB. Borders of salt marshes. Aug. Sept. 1\.; very smooth, 3 5 

 feet high ; spikes 8 14 ; anthers yellow. 



27. ORYZOPSIS. 



O. asperifolia : culm nearly naked ; leaves erect, rigid, pungent at the 



point ; flowers in a racemose panicle. 



HAB. Mountain meadows. April May, 1\. ; culm 18 inches high ; 

 radical leaves long ; culm leaves few, very short ; panicles very 

 simple ; corolla white, hairy ; seed large, white. 



DIGYNIA. 

 28. LEERSIA. Rice-grass. 



JLi. virginica: panicle simple; the lower branches diffuse; flowers 

 appressed, monandrous, sparingly ciliate on the keel. 



HAB. Wet woods and swamps. August, ty; culm 2 4 feet high, 

 genicul ; sheaths scabr. ; Jlowers clasping the pedicels, punctate. 



