66 TRIANDRIA. DIGTNIA. 



sion and almost pung-ent acuteness of the calix and co- 

 rolla; valves connecied ai their base by a very copious, 

 long- tomenuim; panicle semiverticillate and coarctate.) 

 4. iiemorulis. 5. uyinita. 6. ulpina? 7- co7npressa. 8. nervate. 

 9. aiitumnaUs, KL.f 10. angnstifolia. 11. aquatica. Vi. Jiui- 

 tans. 13. rigida. (These are nearly all introduced species, 

 or common to Europe as well as America, and of great 

 importance in ai;r:culture.) 14. capillaris. 15. tenuis^ El. 

 16. hirsKta. 17. subverticillnta. 18. crocatei.\ 



§ II. Brizoma. II Spculi erect, closely imbricated, flow- 

 er glumes ofstn arigularly 3-nerved; without a connecting 

 villous; Valves short, ovate, obliquely pointed, (sometimes 

 producing the a])pearance of marginal serratures,) inner 

 valve small, seeds more or less spherical. 



f Piingens would perhaps have been a better name for this 

 early flowering vernal grass. 



Obs Root somewhat cespitose and perennial; culm partly 

 ancipiial, about a foot high. Radical leaves ertct, long, and 

 narrow; leaves on the culm generally 2, flat, oblong, lanceolate, 

 scabrous only on the margin, the lower about an inch long, ^he 

 upper just visible; all erect and carinate, with a coarctate pun- 

 gent point; stipula truncate, lacerate, sometimes abruptly acu- 

 minate; sheathes long, but a little shorter than the nodes. Pa- 

 nicle suiall, semiverticillate, alternate, horizontally spreading, 

 terminating in an almost simple raceme; branches capillary, 

 mostly by twos or tlu-ees; fasciculi 3 or 4. Spiculi crowded to- 

 wards the extremities of the ramifications, cuneate-ovate, or 

 lanceolate, before flowering somewhat acute, 3 or 4-flovvered. 

 Caliy smooth, inner valve acute. Corrlla ovate lanceolate, a lit- 

 tle obtuse and scariose at the point, villous at the base, obso- 

 letely 5-nerved, 3 of the lesser nerves ciliately pubescent below. 

 Stamina exserted, tremulous, bifurcate at either extremity- 

 Styles sessile, compllcately plumose, white. 



Hab. Around Pluladelphia in rocky situations, on the banks 

 of the Schuylkill, &c. Flowers in April. 



i:Culm leaf\ , round, 18 inches or 2feet high. Leaves smooth, 

 flat, acuminated. 4 to 6 inches long; stipula elongated. Pani- 

 cle elongated, semiverticillate, branches apprtssed, numerous, 

 many-flowered. Sp.kelets in attenuated racemes, small, nearly 

 sessile, acutely ovate, generally 2-flowered, pale green, with 

 yellowish, and sometimes purplish scariose points. Calix acu- 

 minated, nearly as long as the floscuh, obsoletely 3-nerved, and 

 carinate. Flowers oblong, rather obtuse, with a dorsal line of 

 pubescence near the base. 



ilAB. Ill Canada. — Mr. Whitlow. Poa JujdropUla? Persoon 



I) Species of Poa allied to the genus Briza. 



