Trichodium. CLXl. GRAMlNEiE. 599 



C. SPOROBOLUS. Brown. 



G-r. anopa, a seed ; /?aXXa>, to cast forth ; iu fruit in loonc, niid eajiily falls out 



Panicles contracted ; glumes 2, glabrous, awnless, unequal, one or 

 both much shorter than the paleiii : paleic 2, concave, nearly equal, 

 beardless ; fruit loose, free, not enclosed in the paleaj. 

 S. Asi'KR. Sullivaiit? 



H/. long, while, fibrous ; si. stout, glabrous, geniculate at base, 2f high ; 

 lis. rigid, glabrous, 2 — 8' by 1 — 3", tapering to a long, pungent point ; branches 

 with sliort leaves, barren, also ending in a long, pungent point ; shf-uths ciliate at 

 edge and bearing dense tulls of long, white hairs at top ; panicUs small, terminal 

 and lateral, half enclosed in the long sheaths; sjrikelcls blackish-green; lower 

 glume very short, upper nearly as long as the paleai ; fr. compress>ed, obovate, 

 i" in length,— Ij. Ohio, SuUirant! 



7. POLYPOGON. Desf. 



Gr. rroXvs, many, Trcoytoi/, beard ; a characteristic term. 



Inflorescence contracted into a spike ; glumes 2, nearly equal, 

 obtuse, with long awns ; paleae shorter than the glumes, lower one 

 entire, with a short, straight, tender awn (sometimes awnless), upper 

 one bifid, toothed. 



P. RACEMosus. Nutt. (P. glomcratus. WUld. Agrostis racemosus. Mx. 



Muhlenbergia glomerata. lYin.) — Glaucous; 5^. compressed, erect, smooth, 

 with appressed branches or subsimple, 1^ — 4f high ; Ivs. somewhat 2-rowed, erect, 

 flat, rough, 3 — 5' long, with closed sheaths ; panicle spicate, dense, conglome- 

 rated, interrupted, 2—3' long, many-flowered ; gluvies linear, i the length of 

 their awns ; lovxr palea mucronate. — Ij. Bog meadows, also on rocky mountains I 

 N. Eng. to Mo. ! Aug., Sept. 



8. TRICHODIUM. 



Gr. ^pt^, TpiKos, hair; from its capillary inflorescence. 



Inflorescence a capillary panicle ; glumes 2, subequal, narrow and 

 acute ; palea 1 (or 2, the upper very minute), awnless. shorter than 

 the glumes, loosely enclosing the caryopsis. 



1. T. LAXiFLORUM. Michx. (Agrostis Michauxii. Trin.) Thin grass. 



St. erect, smooth, very slender, I — 2f high; Its. 3 — G' long, linear-lanceo- 

 late, scabrous, lower ones involute, upper ones shorter and flat ; shcafh rather 

 open; panicle large and very diffuse, with long, capillary, verticillate branches, 

 trichotomously divided near the end ; spikclcts in terminal clusters, purple ; glumes 

 linear-lanceolate. — % Pastures and roadsides, U. S. and Brit. Am. Jn. 



2. T. MONTANUM. Torr. (Agrostis Torreyi. Tuckm.) Mountain Hair Grass. 

 Sis. caespito.se, erect, filiform, simple, in small tufts, 8 — 12' high ; radical 



Ivs. 2 — 3' long, involute-filiform, cauline rather longer ; slip, bifid, serrate ; pan. 

 ovate, branches spreading, finally divaricate, capillary, hi.spid ; spikclcts fascicu- 

 late at the ends of the branches ; glumes equal ; palea with a short, twisted awn 

 at the back. — 7]. Mts. and rocky woods, N. H. and N. Y. 



3. T. scABRLM. Muhl. (Agrostis scabra. WUld.) Hough Hair Grass. 



St. geniculate at base, a."*surgent, branched, 1 — 2f high; /r.s-. rough, striate, 

 linear-lanceolate, 4 — 6' long, with the sheaths commonlv closed and smooth ; 

 panicle long, with verticillate, divaricate,- dichotomously divided branches which 

 are much shorter than in T. laxijlorum ; spikclcts pale green, not clustered. — % 

 Common in dry soils, N. Eng. to 111. July. 



4. T. ALTissiML'M. Michx. (T. elatum. Ph. Comucopiae alt. Walt.) 



Sf. erect, rigid, simple, slender, 3f high, leafy; Irs. broadly linear, sca- 

 brous flat, 6 — 8' long ; ^'Iiraths scarcely smooth; panicle purple, exserted. con- 

 tracted, branches in whorls of 4s — 6s, erect, rather rigid, and dense-flowered at 

 the ends; glumes subequal, lanceolate, acuminate, scabrous on the keel, about J" 

 51 



