GRAMINE^. 411 



16. P. nervata U'illd. : panicle equal, diffuse ; branches weak, and 

 at length pendulous ; spikelets 5-flowered ; florets free, conspicuously 

 7-nerved, obtuse. P. striata Mich. Briza canadensis Nntt. 



HAB. Wet meadows. N. S. June. U.Culm 34 fe*et high. 

 Panicle large, with ovate spikelets. 



17. P. clongata Torr. : panicle elongated, racemose ; branches soli- 

 tary, appressed ; spikelets ovate', obtuse, tumid, 3-flowered ; florets 

 free ; stipules almost wanting. 



HAB. Wet meadows. N. S. July. U- Culm 3 feet high. 

 Panicle 8 10 inches long, nodding. 



18. P. obtusa Muhl : panicle ovate, contracted ; spikelets ovate, 

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

 smooth, obtuse ; lower one indistinctly 7-nerved ; leaves as long 

 as the culm, and with the sheaths smooth. 



HAB. Swamps. N. S. Aug., Sept. U- Culm 3 4 feet high. 

 Panicle demise, many-flowered. 



19. P. canadensis Torr. : panicle large, effuse ; spikelets semi-ver- 

 ticillate, flexuous, at length pendulous ; spikelets ovate, tumid, 5 8- 

 Howered ; florets free ; lower palea somewhat acute, 7-nerved ; - up- 

 per one very obtuse ; stamens 2. Briza canadensis Mich. 



HAB. Swamps. Can. and N. S. July, Aug. If.. Culm 3 4 

 feet high. Panicle large, with the branches at length spreading. 



20. P. capillaiis Linn. : panicle very large, loose, expanding, capil- 

 lary ; spikelets 3-flowered, ovate, acute ; florets free ; culm branched 

 at the base ; leaves hairy. 



HAB. Sandy fields. N. Y. to Car. Aug. . Culm a foot or 

 more high. Panicle large, pyramidal, much branched. ^ 



21. P. hirsutaMich. ; culm erect, compressed, simple ; sheaths hairy ; 

 panicle very large, capillary ; branches expanding, at length reflexed, 

 bearded in the axils ; spikelets oblong, about 5-flowered ; palese cili- 

 ate on the' margin. 



b. spectabilis Torr. : spikelets linear, 10 15-flowered. P. specta- 

 bilis Pursh. 



HAB. Sandy fields. N. S. S. to Geor. July, Aug. If. 

 Culm 18 inches high. Panicle a foot long, much branched, pur- 

 plish. Var. b. is taller. 



22. P. pectinacea Mich. : culm cespitose, oblique ; leaves hairy at the 

 base ; panicle capillary, expanding, pyramidal, hairy in the axils ; 

 spikelets linear, 5 9-flowered ; florets free, acute ; upper palea pre- 

 sistent. P. pilosa Muhl. P. tenella Pursh. 



HAB. Sandy fields. N. Y. to Car. July, Aug. 0. Culm 

 8 12 inches long, geniculate at base. Panicle large, loose, 

 . purplish. 



23. P. reptans Mich. : dioecious ; culm branched, creeping ; panicle 

 fascicled ; spikelets linear-lanceolate, 12 20-flowered ; florets acumi- 

 nate. 



