Trichodium. CLXl. GRAMINE^. 599 



G. SPOROBOLUS. Brown. 



Gr. anopa, u aeed ; 0aWo}, to cast forth ; its I'ruit is loose, and easily falls out. 



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

 both much shorter than the paleae ; paleae 2, concave, nearly equal, 

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



S. ASPER. Sulliv^anf? 



i?/. long, white, fibrous; 5^. stout, glabrous, geniculate at base, 2f high ; 

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

 with short leaves, barren, also ending in a long, pungent point ; sheaths ciliate at 

 edge and bearing dense tufts of long, white hairs at top ; panicles small, terminal 

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

 ghime very short, upper nearly as long as the paleae ; fr. compressed, obovate, 

 h" in length,— TJ. Ohio, Sullivant! 



7. POLYPOGON. Desf. 



Gr. rroXvs, many, izoiyoiv^ beard ; a characteristic term. 



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

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

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

 one bifid, toothed. 



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



Muhlenbergia glomerata. TVm.) — Glaucous; st. compressed, erect, smooth, 

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

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

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

 their awns ; loiaer palecB mucronate. — 1\. Bog meadows, also on rocky mountains 

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



a TRICHODIUM. 



Gr. 5pc|, TptKOi, 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. Tria.) Thin grass. 



St. erect, smooth, very slender, I— 2f high ; lis. 3 — 6' long, linear-lanceo- 

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

 open ; panicle large and very dilfuse, with long, capillary, vcrticillate branches, 

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

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



2. T. MONTANLM. Torr. (Agrostis Torreyi. Tuckvi.) Mountain Hair Grass. 

 Sts. cae.spitose, erect, filiform, simple, in small tulls, 8 — 12' high ; radical 



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

 ovale, branches spreading, finally divaricate, capillary, hi.spid; spikelcts fascicu- 

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

 at the back. — % Mts. and rocky wood.^, IN. II. and N, Y. 



3. T. scABRUM. Muhl. (Agrostis .scabra. Willd.) Rough Hair Grass. 



St. geniculate at ba^e, a.^-surgcnt. branched, 1 — 2f higli; /c.v. rough, striate, 

 linear-lanceolate, 4 — G' long, with the sheaths commonly cIo.sed and smooth; 

 panicle long, with vcrticillate, divaricate, dichotomously divided branches which 

 are much shorter than in T. hi.rifiorum ; sjnkclels pale green, not clustered. — '2\- 

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



4. T. ai,tissImi:m. Michx. (T. elatum. Ph. Coraucopiac alt. Wali.) 



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

 brous flat, G — 8' long ; .^htafhs srarrcly smooth; pnnirlc purple, e.xserted. con- 

 tracted, liranches in whorls of 4s — Gs, erect, rather rigid, and den.se-flowered at 

 the ends ; glumes subequal, laneeolate, acuminate, scabrous on ihe keel, alK»ut i" 



r,i 



