410 MONOCOTYLEDONOUS PLANTS. 



than the smooth sheaths ; florets acute, 5-nerved, webbed at the base ; 

 stipule short, truncate ; root creeping. 



HAB. Meadows. Penn. to Car. May July. U-Culm 2 X 

 feet high. Pftnicle pyramidal, spreading. Introduced. 



9. P. rir/V/V MnltL: leaves flat, linear, abruptly acute; panic!*- 

 somewhat crowded ; spikes ovate, acute, 4-flowered. 



HAB. Meadows. Penn. to Car. July. 2|. Culm erect, 3 feel 

 high, oblique at base. Panicle diffuse, with 3 or 4 branches at 

 each joint. Differs from the preceding in the compression and 

 almost pungent acuteness of the glumes and palere, (Nutt.) but 

 is perhaps only a variety. 



10. P. parriflora Pursh : panicle diffuse, capillary; spikes small, 

 generally 3-flowered ; florets rather obtuse, striate, caducous ; leaves 

 distichous, flat. 



HAB. Shady woods. N. Y. to Car. July. I/. Cu/m decum- 

 bent 12 18 inches high, somewhat compress very 

 smooth. Florets 1 i. 



11. P. corifcrta EU. : panicles terminal and axillary, erect, compres- 

 sed, with the florets clustered ; spikelets 8-flowered, smooth. P. 

 glomerata Wait. 



HAB. Penn. ScJuccinilz. S. to Car. 1. Culm erect, genicu- 

 late, 2 3 feet high. Leaves smooth, flat, serrulate on the mar- 

 gin. Panicles 4 8 inches long. 



12. P. tririalis Linn. : panicle equal, diffuse ; spikelets oblong-oval* 1 . 

 about 3-flowered ; florets webbed at the base, 5-nerved ; culm and 

 sheaths roughish ; stipule oblong ; root creeping. P. gtolvnifera, Nuhl. 



HAB. Wet meadows. N. S. June Aug. If.. Culm 2:) 

 feet high. Panicle large, pyramidal, whorled. 



13. P. comprcssa Linn. : panicle contracted, somewhat secund : 

 spikelets oblong, 3 6-flowered ; florets webbed ; glumes nearly equal ; 

 culm oblique, compressed ; root creeping. 



b. sylvestris Torr. : panicle loose, spreading; spikelets 23- 

 flowered ; culm slender, nearly erect. 



HAB. Fields and woods. N. S. June, July. 21. Root creep- 

 ing. Culm procumbent or geniculate. Panicle almost spiked. 



Blue-grass. 



14. P. serotina Ehrh : panicle elongated, diffuse, at length some- 

 what secund ; spikelets ovate-lanceolate, 2 3-flowered ; florets a little 

 webbed at the base, yellow at the tip, obscurely 5-nerved ; root creep- 

 ing. P. palustris JMuhl. 



HAB. Wet meadows. N. S. June. !. Culm 2 3 feet high, 

 erect. Panic!* hmch branched. Red-top. 



15. P. nemoralis Linn. : panicle attenuated, weak ; branches flexu- 

 ous ; spikelets ovate, about 3-flowered ; florets loose, slightly webb- 

 ed, acute, obsoletely nerved ; stipule almost wanting. 



HAB. Woods. N. S. July, y. Culm 2 feet high. Pamcle 

 with capillary branches. 



