402 



ORDER 155. GRAMINE^E. 



S P. Ji lp in a L. Culms erect, G 12'; Ivs. broad-linear, 12' by 2 3"; panicle 



ovoid-oblong 1 , loose, with rather large (3") ovate spikelets; flowers about 5(4 9), 

 ovate, y. Isle Royal, L. Superior (Porter), C. W., and North. 



9 P. comi>rssa L. Blue G. Plant bluish green ; culm compressed, decumbent at 



base, rigid, 1218' ; pan. contracted, 3' by 1', or less ; spikelets glomerate, ovato 

 oblong; fls. 3 7, 1" long. 2f Pastures, etc. : common. May, June. 



10 P. sylvestris Gr. Culm compressed, erect, 1 2f; Ivs. linear, soft; pan. oblong 

 pyramidal, thin; branches flexuous, the middle longest; spkl. oval, H" ; fls. about 

 3, lance-oblong, 1". obtuse, if. Woods, meadows, N. Y. to Va., and W. 



IIP. csesia Sm. (P. uemoralis Torr. P. alsodes Gr. P. Guadini K.) Culm com- 

 pressed, 18 3(X, sheathed to near the top ; pan. large (012' long), loose, roughish ; 

 epkl. lance-ovafe, 2 2J" ; fls. 2 or 3, lance-linear, acute, as long as the very acute 

 glumes (li 1J") ; pales obscurely veined, n Woods, N. H. to Penn., and Wis. 



12 P. serotliia Ehrh. Foul Meadow. False Red-top. Culms erect, weak, 2 3f; 

 Ivs. ivirrow, flat, long ; ligules elongated, torn ; pan. large, open, capillary ; epkl. 2- 

 or 3-flwd., If 2" long, Often tawny ; gls. and fls. acute, narrow, y. Wet, N. July. 



13 P. trlvialis L. Rough Meadow G. Culms roughish backward, 2030'; Ivs. 

 rough-edged, the lower elongated ; ligules long, pointed; pan. dense, lance-shaped, 

 35', spkl. snbsessile, 2-3-flwd., fls. oblong, acute, strongly 5-veined. y. N. Jn., Jl. 



14 P. prateiisls L. Spear G. June G. Smooth; culm 1 2f, terete; lignles 

 short, truncate; pan. open, egg-shaped, 3 10'; spkl. ovate, subscssile, 2". aboat 

 4-flowered ; fls. ovate, acute, close. i Abundant and valuable. April, May. 



46. BRYZOPYRUM, Link. Spikelets OQ -flow- 

 ered, compressed, crowded in a spikelike panicle. 

 Glumes unequal. Pales awnless, sub-coriaceous, 

 not cariuate, obsoletely many-veined. it Leaves 

 mostly rolled, smooth and rigid. Fls. dioecious. 



II. splcutiim Hook, (a) Culm rigid, erect, 1020', 

 branched at base, beset with many bayonet shaped Ivs., 



; 13', the highest exceeding the short, spikelike panicle 

 (a); spkl. (, c) 7-9-flwd. (</, pistillate flower, e, a sta- 

 men.) Salt marshes, Conn, to Car. July. 



47. GLYCERIA, Br. MANNA G. Spikelets 

 OO-fhvd., teretish or turbid, rachis jointed. Glume 



subequal, pointless. Pales awnless, webless, her- 

 baceous, the lower mostly 7-veined, rounded on the back, not 

 Grain free, it Smooth grasses in wet places, with 

 Creeping rhizomes and simple panicles. Sheaths 

 mostly fistular (not split). 



Salt marsh grasses. Lower pale 5-veined. 



Stigmas sessile, simply plumed Nos. 1, 2 



g In fresh swamps, etc. Lower pale 7-veined. 



Stigmas doubly plumous. ..(a) 

 a Spikelets linear-lanceolate, in a very sim- 

 ple panicle Nos. 3, 4 



a Spikek-ts linear-oblong, in compound, 



spreading panicles Nos. 5, 6 



a Spikelets ovate, short, turgid... (ft) 



b In slender appressed panicles. ..... . .Nos. 7, 8 



6 In an open, recurved panicle Nos. 9, 10 



cariante, 







