596 CLXIL GRAMINER. Acrostis. 
5. A. stricta. Michx. Upright Aristida. 
St. strictly erect, cespitose, branched, 2—3f high; lvs. straight, erect,* 
pubescent, linear, convolute above ; panicle long, loosely racemose ; spikelets ap- 
pressed ; glumes unequal, very acute ; lower pale@ hairy at base; awns twice as long 
as the pale, spreading, the middle one the longest.—2| Penn. to Car. W. to Mich. 
2. STIPA. 
Lat. stipa, a foot-stalk ; alluding to the stipitate fruit of some of the species. 
Glumes 2; palez mostly 2, shorter than the glumes, the lower 
with a long awn at the apex, the upper entire; awn jointed at the 
base, deciduous ; caryopsis striate. 
1. S. avenacea. Feather Grass. 
St. naked above; 2—3f high; vs. smooth, striate, setaceous, chiefly radi- 
cal; panicle spreading, somewhat 1-sided, 4—6’ long, at length diffuse, branches 
capillary, solitary and in pairs; glwmes nearly equal, mucronate, as long as the 
dark brown, cylindric fruit; scales 2, lanceolate; dwn twisted, 2—3/ in length.— 
2 N. Y. to Car. 
2. S. suncea. Pursh. Rush-leaved Feather Grass. 
St. 2—3f high ; lws. convolute-filiform, smooth inside, long; panicle loose; 
glumes loose, filiformly acuminated to more than twice the length of the fruit ; 
jr. attenuated at base into a stipe which is a third of its length, stipe acute, 
pubescent; palee obtuse, distinctly articulated to the awn, which is smooth and 
slender, scarcely contorted and 4—6/ in length.—2 Prairies, Ill., Mo. When 
in fruit, the pungent stipe adheres to everything that comes in its way. Aug. 
3. S. Canapensis. Lam. 
Lvs. setaceous; panicle small; glumes smooth, ovate-obtuse, as long as 
the pubescent fruit ; awn thick and short.—2 Amherst, Mass. Dewey. Neither 
this nor the preceding species is common or of much value in agriculture. 
3. PIPTATHERUM. Palis. 
Gr. mitTw, to fall, Sepos, harvest. 
Panicle racemed ; glumes membranaceous, longer than the ellipti- 
cal, cartilaginous palez ; lower palea awned at the tip; scales ovate, 
entire ; caryopsis coated. : 
P. nigrum. Torr. Soe loge om: melanocarpa. Muhl.) Black-seeded Millet. 
St. erect, simple, leafy, 18—24’ high; panicle simple, flexuous, few- 
flowered; spikelets racemose, ovoid-lanceolate ; glumes acuminate, mucronate, 
5—6” in length, smooth; pale hairy, nearly black when ripe, the lower one 
tipped with an awn an inch in length; fruit black.—2 Rocky hills, N. Eng. 
to Ky., frequent. Aug. 
4,.ORYZOPSIS. Rich. 
Named for its resemblance (ors) to the genus Oryza. 
Panicle racemed ; glumes 2, subequal, loose, obovate, awnless ; 
palez 2, cylindric-ovate, hairy at base ;- scales linear-elongated. 
O. asperrFoLia. Michx. Mountain Rice. 
St. nearly naked, purple at base, 10—20’ high; lws. subradical, erect, 
rigid, pangent at the point, nearly as long as the stem, cauline ones few and 
very short; spikelets in a racemose, simple, flexuous panicle, 1—2 upon each 
branch; glwmes coy: td acuminate; palee white, the lower one with a long 
bent awn.— Woods, Free States, N. to Subarctic Am: Leaves green through 
the winter. Caryopsis white, about as large as rice, farinaceous. May. 
Trize 2. AGROSTIDEZ.—Inflorescence panicled, rarely spiked. Spike- 
lets solitary, 1-flowered. Glumes and palez of nearly similar texture, usu- 
ally carinate. 
5. AGROSTIS. 
Gr. aypos, a field; it being eminently an occupant of fields and pastures. 
Inflorescence paniculate ; glumes 2, acute, subequal, the lower one 
