58 TRIANDRIA.— DIGYNIA. 



11. P. serotina: panicle elongated, diffuse, at length 



somewhat secund ; spikelets ovate-lanceolate, 2- 

 3-flowered ; florets a little webbed at the base, 

 yellow at the tip, obscurely 5-nerved ; root 

 creeping. 

 HAB. In wet meadows. June. If.. Culm 2-4 feet 

 high; pan. ap press, when young > cal. often 2 fl. ; 

 anth. yellow. 



12. P. nemorafis: panicle attenuated, weak; branches 



flexuous ; spikelets ovate, about 3-flowered ; 

 florets loose, slightly webbed, acute, obsoletely 

 nerved ; stipule almost wanting. 

 HAB. Rocky woods. July. If. Pale green; pan. 

 capillary ; florets at length distant. 



13. P. nervata : panicle equal, diffuse ; branches weak, 



and at length pendulous; spikelets 5-flowered; 

 florets free, conspicuously 7-nerved, obtuse. 

 HAB. In wet meadows and in ditches. June. ij. . 

 Culm 3-4 ft. high; pan. large, many-fl. ; spik. 

 ovate ;fl. deciduous ; slam, mostly 2. 



J4. P. elongata: panicle elongated, racemose ; branches 

 solitary, appressed ; spikelets ovate, obtuse, tumid, 

 3-flowered ; florets free; stipule almost wanting. 

 HAB. Wet meadows. June — July. U. . Culm 3 feel 

 high, dark green ; pan. nodding ;fl. 5-nerved. 



15. P. obtusa : panicle ovate* contracted ; spikelets 

 ovate, tumid, 5-7-flowered ; florets free ; glumes 

 scarious ; corolla ovate, smooth, obtuse ; inferior- 

 valve indistinctly 7-nerved ; leaves as long as the 

 culm, and with the sheaths smooth. 

 HAB. Swamps. Aug. — Sept. l* . Culm. 3-4 ft. high. 

 firm ; leav. long, dark green ; pan. dense, many-fl. : 

 spik. large. 



10. P. canadensis : panicle large, eftuse ; spikelets semi- 

 verticillate, flexuous, at length pendulous ; spike* 

 lets ovate, tumid, 5-8-flowered ; florets free ; infe- 

 rior valve somewhat acute, 7-nerved ; superior 

 valve very obtuse ; stamens 2. 

 HAB. Swamps. July — Aug. y. . Culm 3-4//. high. ; 

 leav. long ; pan. at first pyramidal, at length much 

 spreading and pendulous. 



17. P. capillaris : panicle very large, loose, expanding. 



