PoA. CLXI. GRAMINEiE. Gl5 



Ivs. lance-linear, short, smix)th,carinate, on loose, {glabrous sheaths; 5^1/;. oblong, 

 dentate ; panicle spreadinj!^, the branches generally solitary, at length horizontal ; 

 S'pikelcfs ovatc-oblong, rather numerous, containing about 5, loose ti owe rs, — (1) A 

 small, abundant, annual grass, N. Eng. to Ohio, forming a dense, soil and 

 beautil'ul turf. May — Sept. 



9. P. NKRV.4TA. Willd. (P. striata. M/rAjc, Briza Canaden.sis. iVu//.) Foul 

 Muiloin. — SI. smooth, 3 — If high ; /r.-c. lance-linear, striate, rough above, 



about a toot long, on striate, rougliish slu'aths; stip. lacerate; /ntni/ir large, 

 loose, diffuse, equal, branches weak, pendulous in fruit, long and capillary, in 

 2s or 3s ; spikelcts ovate-oblong, containing about 5, obtu.se, conspicuously 7- 

 veined flowers. — % A beautiful and valuable grass in wet meadows, N. Eng. to 

 Mich. June. 



10. P. ELONGATA. Torr. 



St. round, erect, smooth, 3f high; Its. narrow-linear, smooth, 8 — 15' loni< ; 

 shecitlis .striate, .smooth ; dip. very .short ; panicle (8 — 10') elongated, racemose, 

 nodding, branches solitary or in 2s, appres.scd ; .spikelcts ovate-obtuse, tumid, 

 containing about 3, obtuse, 5-veined flowers. — 1[ Wet meadows N. Eng. to 

 111. July. 



11. P. oBTusA. Muhl. 



St. smooth, firm, 2 — 3f high ; lis. dark green, linear, often surpassing the 

 stem, and with the sheaths smooth ; panicle dense, ovate, many-flowered, 3 — 4' 

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

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



12. P. coNFERTA. Ell. (P. glomcrata. Walt.) 



S'. erect, geniculate, 2 — 3f high ; lis. glabrous, flat, serrulate on the mar- 

 gin ; panicles terminal and axillary, 4 — 8' long, erect, compres.sed, Avith the 

 spikelets denselv clustered; spikelcts S-^o\veredi, glabrous, — % Penn., Schceinitz 

 (fide Beck), S. to Car. 



13. P. MODESTA. Tuckerman, 



St. short, geniculate at base, branched, compressed, glabrous; Ivs. 3 — 1' 

 by \", rather rigid; sJiealJis striate, smoothish; slip, conspicuous, truncate, erose 

 and laciniate ; panicle strict, 6 — 9' long, branches solitary, filiform, scabrous ; 

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

 lower fl. larger, sessile, veinless ; caryopsis ovate, fuscous. — Brooksides, Cam- 

 bridge, Mass. E. T. 



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



St. round, smooth, erect, 3 — if 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, lo^ccr about 7-veinec] ; sta. 2. — % 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 ; skcaths striate, with long hairs about the throat and mar- 

 gin ; stip. short ; panicle very large (near a foot long), with diffusely spreading, 

 capillary branches, axils smooth; spikelcts ovate, acute, about 3-flowered, on 

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



16. P. niR.suTA. Michx. 



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

 at end, surpassing the stem, hairy at base ; sheaths loo.se, longer than the inter- 

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

 capillary, branches spreading, reflexed in fruit, hirsute in the axils ; spikelcts 

 oblong, about 5-flowered; palea: ciliate.— TJ. Sandy fields. July, Aug. 



/?. spectabilis. ( Torr. P. spectabilis. P.) Spikelcts linear, iO— 15-flowered 

 St. 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* 



