600 CLXI. GRAMINE. PsaMMa. 
long ; palee_5-veined, a little shorter than the upper glume; sta.3; stig. plu- 
mose.—2 N.J.toCar. Aug. ' ; 
B.laxa. Panicle more loose, with long, green branches.— White Mts. 
5. T. concinna. Wood. (Agrostis concinna. Tuckm.) 
St. low, erect; Jvs. filiform-setaceous; pan. ovate, spreading, glabrous; 
gi. unequal, lower acute-mucronate, roughish above, upper acute, glabrous ; 
palee glabrous, awn from below the middle, contorted, scabrous, exceeding the 
flower, with a few hairs at its base—White Mts. Tuckerman.—The species are 
not valuable in agriculture. 
9. MUHLENBERGIA. Schreb. 
In honor of the Jate Henry Muhlenberg, D.D., a well known, eminent botanist. 
Panicle nearly simple; glumes 2, very minute, unequal, fringed ; 
paleze many times longer than the glumes, linear-lanceolate, veined, 
hairy at base; the lower one terminating in a long awn. 
1. M. pirrisa. Schreb. Dorp-seed Grass. 
St. decumbent, diffuse, branching, slender, compressed ; branches assurgent ; 
lus. 2—3' by 2”, linear-lanceolate, rough, with smooth, striate, open sheaths ; 
panicles terminal and lateral, with remote, appressed, rough branches; spikelets 
pedicellate, often purple; awn about as long as the palez.—2 Borders of woods 
and fields, N. Eng. to Car. and Ky. Aug. | 
2. M. erecta. Roth. (Brachyelytrum aristatum. i) 
St. erect, simple, retrorsely pubescent at the nodes, 2—3f high; dvs. lanceo- 
late, scabrous, ciliate on the margin, 4—6’ long, 3” or more wide, with some- 
what open sheaths; panicle terminal, simple racemose, contracted ; spikelets 
pedicellate, large; giwmes very unequal, upper one subulate; lower palee half as 
long as its awn, wpper palee with a short awn at base lodged in the dorsal 
groove.—?| Rocky hills, Can. and U.S., frequent. July. 
10. CINNA. 
Glumes 2, subequal, compressed, without involucre or awns, upper 
one 3-veined ; palezw 2, naked at base, on short stipes, lower one 
larger, enclosing the upper, with a short awn a little below the tip ; 
stamen 1. 5! 
C. aruNnpINacEa. Willd. (Agrostis Cinna. Lam. A. monandra. Hornem.) 
St. simple, erect, smooth, 3—5f high ; Js. linear-lanceolate, 12—18’ by 3—5” 
pale green, rough-edged, with smooth, striate sheaths; stip. long, lacerated ; 
panicle near a foot in length, rather attenuated above and nodding, with the 
branches capillary, drooping, and arranged somewhat in 4s; glwmes linear-lan- 
ceolate ; lower palee with a short, straight awn a little below the tip— A 
beautiful grass, sought by cattle, in rich, shady soils, U.S. and Can. Aug. 
11. TRICHOCHLOA. DC. . 
Gr. roré, recxos, hair, xAoa, grass ; from the capillary inflorescence. 
Glumes 2, very minute; pale many times longer than the 
glumes ; naked at base, lower one convolute at base, terminating in 
a long, unarticulated awn. . 
T. capituaris. DC. (Stipa. Lam. Agrostis. Muhl. Muhlenbergia. Lindi.) 
Cespitose ; sts. erect, very slender and smooth, 18—24’ high ; ls. erect, 
becoming filiform towards the end. 1—1if long; panicle diffuse, with the 
branches 1—4’ long, in pairs, and as fine as hairs; spikelets purple; lower palee 
produced into an awn 3 or 4 times its length—?| An exceedingly delicate grass, 
with large, purple, glossy and almost gossamer-like panicles, waving in the 
breeze. Sandy soils. Jn. Ji. 
12 PSAMMA. Palis. 
Gr. Waypos, sand; in which this grass grows on the sea shore. 
Panicle spicate; glumes 2, awnless; pale 2, shorter than the 
