Trichodium. CLXl. GRAMlNEiE. 599 



G. SPOROBOLUS.- Brown. 



Gr. oTTopa, a seed ; /?aXA&), to cast forth ; its fruit is loose, and easily falls out. 



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

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

 beardless ; fruit loose, fr-ee, not enclosed in the paleae. 



S. ASPER. Snilivant'? 



EL long, white, fibrous ; st. stout, glabrous, geniculate at base, 2f high ; 

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

 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; spikelels blackish-green; lower 

 glume very short, upper nearly as long as the pale^ ; fr. compressed, obovate. 

 k" irileugih,— % Ohio, SiiUiL- ant! 



7. POLYPOGON. Desf. 



Gr. voXvs, many, irajyuv, 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. RACBMosus. Nutt. (P. glomeratus. Willd. Agrostis racemosus. Mx. 



Muhlenbergia glomerata. 7>m.)— Glaucous ; st. compressed, erect, smooth, 

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

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

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

 their awns ; lower palecB mucronate. — 7|. Bog meadows, also on rocky mountains 

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



8. TRICHODIUM. 



Gr. &pi^, rptKOS, 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. 7>m.) Thin grass. 



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

 late, scabrous, lower ones inv^olute, upper ones shorter and flat ; sheath rather 

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

 trichotomously divided near the end ; spiMeis in terminal clusters, purple ; glujnes 

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



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

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



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

 ovale, branches spreading, finally divaricate, capillary, hispid ; spikelels fascicu- 

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

 at the back. — 'Zj. Mts. and rocky woods, N. H. and N. Y. 



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



St. geniculate at base, a.ssurgent, branched, 1 — 2f high; Irs. rough, striate, 

 linear-lanceolate, 4 — C long, with the sheaths commonly closed and smooth ; 

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

 are much shorter than in T. laxijlorum ; spikelels pale green, not clustered. — Tj. 

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



4. T. ALTissiMUM. Michx. (T. elatum. Ph. Cornucopise alt. Walt.) 



St. erect, rigid, simple, slender, 3f high, leafy ; lis. broadly linear, sca- 

 brous flat, 6 — 8' long ; sheaths 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 



