TRTCHODiCM. TRIANDRIA. D1GYN1A, 83 



Stigmas nearly sessile. Mich. /^/. I. p. 41. JVut t 

 Gen. I. p. 42. Boem. 8? Sc/iult. Gen. 211. P. 

 de Beauv. Agrost. t. IV. f. 8. Cornucopi.e JValt. 

 Agrostidis spp. Liji^ ^ Tri7i. Thin-grass, 



1. T. laxijlorum Mich.: culm erect, leaves setaceous, 

 and with the sheaths somewhat scabrous ; panicle diffuse, ca- 

 piilarv, with trichctomous bi-aiiches ; calyx unequal. M i c h, 

 F/. TI p. 42, t. 8. Big. Bost.i).22. Pursh fl.l.p.GU 

 excl. syn. Wiild. Elliott Sk. I. p. 99. M u h I. Gram. 

 p. 60. Roem. <$/• Schuli. II. p. 282. Agrostis laxa 

 Schreb. {Muhl, ir P uv sh.) Cornucopia hyemalii 

 Walt. Car. p. 73. 



Roat perennial. Culm about a foot and a half high, very slender, 

 terete. Inferior leaves 4 — 6 incheb long, becoming involute 

 and almost filiform; the superior ones shorter and flat. Sheaths 

 open. Sti/iule lanceolate, lacerate, white. Panicle^ when the 

 flowers are mature, very much spread and loose, pyramidal ; 

 the branches verticillate in threes, hispid, exceedingly slender. 

 Flowers purplish, in terminal fascicles. Glumes of the calyx 

 linear-lanceolate, acuminate ; the inferior one a little shorter. 

 Valve of the corolla lanceolate. Stamens 3 ; anthers pale 

 yellow. Stigmas white, plumose. JSTectariea minute, lance- 

 olate, entire. 



Hab. In dry fields and in exsiccated swamps j common. May 

 — June. 



2. T. scabrum Muhl.: culm geniculate at the base, as- 

 surgent, branched ; leaves linear-lanceolate, flat, striate, sca- 

 brous ; sheaths generally smooth; panicle verticillate and 

 divaricate ; calyx unequal ; corolla ovate, acute, 3-nerved. 

 Muhl. Gram. p. 61. Agrostis scabra Willd. Spec. J. 

 p. 370. 



Root perennial. Culm a foot or 18 inches high, often geniculate 

 and branched at the base, terete, smooth. Leaves 6 — 8 inches 

 long, a line or a line and a half wide, striate, pale green. 

 Sheaths closed. Sti/iule elongated, lacerate, membranaceous. 

 Panicle diffuse, much branched ; the lower part generally 

 concealed in the uppermost sheath; branches in whorls of 5 

 or 6, capillary, scabrous, a little fiexuous, incrassated beneath 

 the calyces. Celyx strongly serrulate on the keel ; margin 

 scarious. Corolla smooth (sometimes awned on the back. 

 Mu h I.) Stamens 3 ; anthers oblong, yellow. Stigmas plu- 

 mose. Seed oblong, acuminate. 



Hab. In dry, open woods; common. August — September. 

 Easily to be distinguished from the preceding species by its 

 pale-green aspect, and by its broader, flat leaves. 



3. T. elatum P ur s h : culm erect, firm ; leaves nar- 

 row-linear, fiat, scabrous ; sheaths smooth ; panicle verticil- 



