e> J 



PoA. CLXl. GRAMINEiE. G15 



Ivs. lance-linear, short, smooth, earinate, on loose, glabrous sheaths ; stip. oblong, 

 dentate ; panicle spreading, the branches generally solitary, at length horizontal ; 

 splkdels ovate-oblong, rather numerous, containing about 5, loose flowers. — Q A 

 small, abundant, annual grass, N. Eng. to OJiio, forming a dense, soft and 

 beautiiul turf. May — Sept. 



9. P. NKRVATA. Willd. (P. striata. Mickx.. Briza Canadensis. Nutt.) Foul 

 Mzadow. — SI. smooth, 3 — 4f high ; Ivs. lance-linear, striate, rough above, 



about a loot long, on striate, roughish sheaths; ^lip. lacerate; panicle large, 

 loose, dill'usc, equal, branches weak, pendulous in fruit, long and capillary, in 

 •2s or 3s; spikcleLs ovate-oblong, containing about 5, obtuse, conspicuously 7- 

 veined flowers.^T]. A beautiful and valuable grass in wet meadows, N. Eng. to 

 Mich. J une. 



10. P. ELONGATA. Torr. 



St. round, erect, smooth, 3f high ; Ivs. narrow-linear, smooth, 8 — 15' lon^, 

 skeatJiS striate, smooth; slip, very short; vanicle (8 — 10') elongated, racemose 

 nodding, branches solitary or in 2s, ai^pressed; spikdcts ovate-obtuse, tumid, 

 concaining about 3, obtase, 5-veined flowers. — 71. Wet meadows N. Eng. to 

 111. July. 



11. P. OBTUSA. Muhl. 



iS*;. smooth, firm, 2 — 3f high; Ivs. dark green, linear, often surpassing the 

 stem, and with the sheaths smooth; panicle dense, ovate, many-flowered, 15 — 4' 

 long; spikelcls ovate, tumid, thick, containing 5 — 7, smooth, ovate, obtuse flow- 

 ers ; lower palea 7 veined. — % Swamps, N. Eng. to Penn. Aug., Sept. 

 ■ 12. P. coNPERTA. Ell. (P. glomerata. Walt.) 



SL'erecl, geniculate, 2 — 3f liigh; Ivs. glabrous, flat, serrulate on the mar- 

 gin ; panicles terminal 'and axillary, 4 — 8' long, erect, compressed, with the 

 spikelets densely clustered ; spikelcls 8-iiowered, glabrous. — 71 Penn., Sckweinitz 

 (fide Beck), S. to Car. 



13. P. MODKSTA. Tuckerman. 



St. short, geniculate at base, branched, compressed, glabrous; Ivs. 3—4'' 

 by h", rather rigid; sheaths striate, smoothish; slip, conspicuous, truncate, erose 

 and laciniate; panicle strict, G — 9' long, branches solitary, filiform, scabrous; 

 spikelets scattered, briefly pedicellate ; glumes unequal, obtuse, erose, glabrous ; 

 lovxr fi. larger, sessile, veinless ; caryopsis ovate, fuscous. — Brooksides, Cam- 

 bridge, Mass. E. T. 



14. P. Canadensis. Torr. (Briza Canadensis. Michx.) 



St. round, smooth, erect, 3— 4f high ; Ivs. broad-linear, rough, glaucous, 

 on smooth sheaths; slip, lacerate, ovate-obtuse; panicle large, 6 — 8' long, 

 branches flexuous, in half- whorls, much spreading or pendulous in fruit; spike- 

 lets short, ovate, tumid, 6 — 8-flowered ; glumes much .shorter than the lower 

 flower ; upper palea very obtuse, lower about 7-veined ; sta. 2. — n\. A large and 

 beautiful grass, in shady grounds. Free States, Can. July, Aug. 



15. P. CAPILLARIS. 



St. much branched at base, smooth, a foot high ; Ivs. linear, attenuated 

 above, flat, smooth ; sheaths striate, with long hairs about the throat and mar- 

 gin; stip. short ; panicle very large (near a foot long), %vith ditfusely spreading, 

 capillary branches, axils smooth ; spikelets ovate, acute, about 3-ilowered, on 

 long pedicels ; palea scabrous. — Dry grounds, U.S. Aug. 



16. P. HiR^tJTA. Michx. 



St. subsimple, compressed, erect, 1 — 2f high ; Ivs. lance-linear, attenuate 

 at end, surpassing the stem, hairy at base ; sheaths loose, longer than the inter- 

 nodes, lower ones hairy, upper ones smooth; slip, fringed; panicle very large, 

 capillary, branches spreading, reflexed in fruit, hirsute'in the axils ; spikelets 

 oblong, about 5-flowered; paleee ciliate. — % Sandy fields. July, Aug. 



/?. spcctabilis. (Tb/T. P. spectabilis. P.) Spikelets linear, iO — 15-flowered 

 $t. taller. 



17. P. MARITIMA. Huds. 



St. somewhat geniculate, round, about a foot high; Ivs. somewhat glau- 

 cous, rough-edged, involute ; panicle erect, dense, branches in pairs, scabrous ; 

 52* 



