TRIANDRIA.— DIGYNIA. 57 



HAB. Wet meadows. Aug. %. Culm 4 — 5, thick, 



leafy ; pan. very large, at first nodding ; spik. purp. 



5. P. maritima : panicle branched, somewhat crowded ; 



spikelets about 5-flowered, terete ; florets rather 



obtuse, indistinctly 5-flowered ; root creeping. 



HAB. Salt-marshes. June. If. A foot high ; leav. 

 involut. ; pan. erect, somewhat flexuous ; spik. linear, 

 purplish ; fi. woolly at base. 

 G. P. brevifolia : panicle loose ; branches in pairs, hori- 

 zontal ; calyx 3 — 4-flowered ; corolla pubescent ; 

 leaves very short; stipules, acuminate. 



HAB. Mountains and woods. April. % . Culm 2 ft. 

 high, erect, and obliq. ; inf. leav. very short ; spike- 

 lets loose ; fl. distant. 

 7 P. pungens : culm compressed ; leaves very short, 

 cuspidate ; panicle somewhat simple, spreading ; 

 spikelets ovate, 3-4-flowered ; florets webbed, 

 rather obtuse, obscurely 5-toothed. 



HAB. Rocky situations. April. 2£. Culm 18 in. high, 

 subancipit. ; culm leaves about 2, erect ; pan. semi- 

 verticil., capill. 

 3. P. pratensis : panicle diffuse ; upper leaves much 

 shorter than the smooth sheaths ; florets acute, 5- 

 nerved, webbed at the base ; stipule short, truncate ; 

 root creeping. 



HAB. Meadows and pastures. May — July. y.. Pan, 

 pyramid. ; spik. ovate ; glum, unequal. 



9, P. trivialis : panicle equal, diffuse, spikelets oblong- 



ovate, about 3-flowered ; florets webbed at tht 

 base, 5-nerved ; culm sheaths roughish ; stipule ob- 

 long ; root creeping. 

 HAB. Moist meadows. June — Aug. If.. Culm 2-3 ft. 

 high, stolonif. ; pan. pyramidal; stipule elongated. 



10. P. compressa: panicle contracted, somewhat secund , 



spikelets oblong, 3-6-flowered ; florets webbed ; 



glumes nearly equal ; culm oblique, compressed ; 



root creeping. 

 HAB. Fields and dry hills. June — July. If.. Culm a 



foot high, assurgent ; leav. glauc. ; panicle sub-spiked. 

 3. sylvestris : panicle loose, spreading ; spikelets 8-3* 



flowered ; culm slender, nearly erect. 

 IIAB. In dry woods. July. 



