402 



ORDER 155. GRAMINE/E. 



8 P. alpiiia L. Culm? erect, 6 12'; Ivs. broad-linear, 12' by 2 3"; panicle eqniu 



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

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



9 P. compressa L. Slue O. Plant bluish green ; culm compressed, decumbent at 



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

 oblong; fls. 37, 1" long. 11 Pasture?, 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, 1J" ; fls. aboiu 

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



IIP. caesla Sm. (P. nemoralis Torr. P. alsodes Gr. P. Guadini K.) Culm com- 

 pressed, 18 30 7 , sheathed to near the top: pan. hirge ((> 12' long), loose, roughish ; 

 spkl. lance-ovate, 2 2J"; fls. 2 or 3, lance-liniar, acute, as long as the very acute 

 glumes (H If") ; pales obscurely veined. V Woods, N. H. to Penn., and Wis. 



1 2 P. serotina Ehrh. Foul Meadow. False Red-top. CulmB erect, weak, 2 3f; 

 Ivs. narrow, flat, long ; lignles elongated, torn ; pan. large, open, capillary ; spkl. 2 

 or3-flwd., lj 2" long, often tawny; gls. and fls. acute, narrow. 11 Wet, N. July. 



13 P. trivlalls L. Rough Meadow G. Culms roughish backward, 20 30'; Ivs. 

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

 3 5', spkl. subsessile, 2-3-flwd., fls. oblong, acute, strongly 5-veined. 7i N. Jn., Jl. 



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

 short, truncate ; pan. open, egg-shaped, 3 10'; spkl. ovate, subsessile, 2", abo.it 

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



46. BRYZOFYRUM, Link. Spikelets OO-flow- 

 ered, compressed, crowded iu a spikelike panicle. 

 Glumes unequal. Pales awnless, sub-coriaceous, 

 not caiinate, obsoletely many-veined. if Leaves 

 mostly rolled, smooth and rigid. Fls. dioecious. 



B. splcatum Hook, (a) Culm rigid, erect, 1020', 

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

 1 3', the highest exceeding the short, spikelike panicle 

 (a) ; epkl. (b, c) 7-9-flwd. (d, pistillate flower, e, a sta- 

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



47. GLYCERIA, Br. MANNA G. Spikelets 

 oo-flwd., teretish or turgid, rachis jointed. Glume 



subequal, pointless. Pales awnless, webless, her- 

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

 Grain free, y 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 NOH. 1, 2 



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



Stigmas doubly plumous. ..(a) 

 a bpikek-ts linear-lanceolate, in a very sim- 

 ple panicle Nos. 3, 4 



a Spikelets linear-oblong, in compound, 



spreading panicles Nos. 5, 6 



a Spikelets ovate, short, tu/gid. ..(b) 



b In slc-nder appressed panicles Nos. 7, 8 



ft Iu an open, recurved panicle Nos. 0. 10 



