m TRIANDRIA. DIGYNTA. foAo 



without nerves ; the inferior one much shorter. Corolla ob- 

 tuse ; inferior valve with 7 elevated nerves, purplish towards 

 the tip; superior valve concave on the back, rather shorter 

 than the other ; margin thickened. Stamens generally 2, in- 

 cluilcfl. Styles short ; stigmas plumose. Seed ovate. 

 Hab. In wet meadows and in ditches. June. 



PoA fiarvijiora fursh Fl.l p. 80. (excl. syn.) and Ellio I g 

 Sk. I. p. 57. appears to be only a variety of this species. 



14. P. elon^ala*: panicle elongated, racemose ; branches 

 solitary, appres?ed ; spikelets ovate, obtuse, tumid, 3-flovvered ; 

 florets free ; stipule almost wanting, 



JRoot perennial. Culm 3 feet high, leafy, terete. Leaves about 

 a foot long, dark green, 2 lines broad, smooth. Sheaths pro- 

 minently striate. Sti/iule exceedingly short. Panicle 8 — 10 

 inches long, nodding. Spikelets disposed in crowded racemes. 

 Calyx nearly equal, 2-thirds the length of the lower floret, 

 acute, 1 nerved. Inferior valve of the coro//a distinctly 5-nerved; 

 superior valve shorter, rounded at the tip ; margin thickenedj 

 entire. Stamens 2 ? Stigmas white. 



Hab. Near Deerfield, Massachusetts. Coo ley. Plainfield. 

 Porter. Williamslown. Dewey. 



15. P. ohtusa M uh L: panicle ovate, contracted ; spike^ 

 lets ovate, tumid, 5 — 7-flowered ; florets free ; glumes scari- 

 ous •, corolla ovate, smooth, obtuse •, inferior valve indistinctly 

 7-nerved ; leaves as long as the culm, and with the sheaths 

 smooth. Muhl. Gram. p. 147. 



Root perennial. Culm 2 — 3 feet high, smooth, firm. Leaven 

 frequently overtopping the culm, 2 — 3 lines broad, dark green. 

 Stipule short, retuse. Panicle 3 — 4 inches long; spikelets 

 much crowded, 2 lines long, thick and swelling. Calyx un- 

 equal ; margins remarkably scarious. Corolla nearly equal ; 

 the inferior valve boat-shaped, generally very obtuse ; superior 

 valve margined, bifid at the tip. Stamens often 2. {Miih i.) 

 Seed obovate, black, corrugated. JVecturies ovate, bifid. 



Hab. In deep swamps in the pine-barrens of New- Jersey. In 

 Pennsylvania and New-England. Muhlenberg. August 

 — September. 



16. F. canadensis^: panicle large, effuse; branches se- 

 miverticillate, flexuous, at length pendulous ; spikelets ovate, 

 tumid, 6 — 8-flowered ; florets free ; inferior valve somewhat 

 acute, 7-nerved ; superior valve very obtuse ; stamens 2. 

 Briza canadtnsis Mich. Fl. I. p. 71. Muhl. Gram. 

 p. 163. Pursh Fl.\.p,82. N ut t. Gen. \\. Supp. Me- 

 OASTACHTA canadensis Roem. (^ Schult, II. p. 593. 



Root perennial. Culm 3 — 4 feet high, erect, terete, smooth^ 

 leafy. Leaves often longer than the culm, about 3 lines broad, 

 scabrous and a little glaucous, iiheuths smooth. Stipule ovate^ 



