TRICHODIUM. CLX1. GRAMINEE. 599 
6 SPOROBOLUS. Brown. 
Gr. cropa, asced; Baddw, 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 palex; palez 2, concave, nearly equal, 
beardless ; fruit loose, free, not enclosed in the palez. FY 
S. asPer. Sullivant? 
Rt. long, white, fibrous; st. stout, glabrous, geniculate at base, 2f high; 
ws. rigid, glabrous, 2—8’ by 1—3”, tapering to a long, pungent point; branches 
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; spikelets blackish-green; lowers 
glume very short, pe nearly as long as the palee; fr. compressed, obovate, 
#” in length,—2 Ohio, Sullivant! 
7, POLYPOGON. Desf. 
Gr. rodvs, many, Twywr, beard ; a characteristic term. 
Inflorescence contracted into a spike; glumes 2, nearly equal, 
obtuse, with long awns; palez shorter than the glumes, lower one 
entire, with a short, straight, tender awn (sometimes awnless), upper 
one bifid, toothed. 
P. racemosus. Nutt. (P. glomeratus. Willd. Agrostis racemosus. Mz. 
Muhlenbergia glomerata. Tvin.)—Glaucous ; st. compressed, erect, smooth, 
with appressed branches or subsimple, 13—4f high ; vs. somewhat 2-rowed, erect, 
flat, rough, 3—5/ long, with closed sheaths; panicle spicate, dense, conglome- 
rated, interrupted, 2—3’ long, many-flowered; glumes linear, 4 the length of 
their awns ; lower palee mucronate.—2, Bog meadows, also on rocky mountains. 
N. Eng. to Mo.! Aug., Sept. 
8. TRICHODIUM. 
Gr. Sorz, retxos, 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. Laxirtoérum. Michx. (Agrostis Michauxii. Trin.) Thin grass. 
St. erect, smooth, very slender, 1—2f high; lvs. 3—6’ long, linear-lanceo- 
late, scabrous, lower ones involute, upper ones shorter and flat; sheath rather 
open; panicle large and very diffuse, with long, capillary, verticillate branches, 
trichotomously divided near the end; spikelets in terminal clusters, purple; glumes 
linear-lanceolate—2 Pastures and roadsides, U.S. and Brit. Am. Jn. 
2. 'T. monrinum. Torr. (Agrostis Torreyi. Tuckm.) Mountain Hair Grass. 
Sts. ceespitose, erect, filiform, simple, in small tufts, 8—12’ high; radical 
ivs. 2—3’ long, involute-filiform, cauline rather longer; stip. bifid, serrate ; pan. 
ovate, branches spreading, finally divaricate, capillary, hispid; spikelets fascicu- 
late at the ends of the branches; giwmes equal; palege with a short, twisted awn 
at the back.—?2| Mts. and rocky woods, N. H. and N. Y. 
3. T. scaBrum. Muhl. (Agrostis scabra. Willd.) Rough Hair Grass. 
St. geniculate at base, assurgent, branched, 1—2f high; Jvs. rough, striate, 
linear-lanceolate, 4—6/ long, with the sheaths commonly closed and smooth ; 
panicle long, with verticillate, divaricate, dichotomously divided branches which 
are much shorter than in T. laziflorum ; spikelets pale green, not clustered.—2 
Common in dry soils, N. Eng. tol. July. . 
4, T. attissimum. Michx. (T. elatum. Ph. Cornucopie alt. Walt.) 
St. erect, rigid, simple, slender, 3f high, leafy; Zvs. 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; glwmes subequal, lanceolate, acuminate, scabrous on the keel, about 3" 
a mI ~ : 
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