426 GRAMINACEiE, 



Moist meadows. N. Y. to Virg. July— Sept. %.—Culm 2—3 feet high, 

 smooth at the joints. Leaves forming a tuft at the base of the culm. Panicle 

 mostly dark purple. Agrostis-like Panic-grass. 



14. P. anceps Mich. : culm compressed ; sheaths ancipital. hairy near 

 the throat and on the margin ; panicles erect, oblong, with simple branches ; 

 spikelets interruptedly racemose, acuminate ; neutral flower with the upper 

 palea oblong obtuse or emarginate. P. rostratum Muhl. 



Fields and meadows. Penn. to Car. July. 1].. — Culm 2 — 4 feet high, com- 

 pressed, somewhat geniculate at base. Leaves linear-lanceolate, hairy above, 

 roughish on the margin. Panicles terminal and lateral, oblong, the branches 

 erect. A variable species. Two-edged Panic-grass. 



15. P. proliferum Lam. : smooth ; culm assurgent or procumbent, branch- 

 ing and geniculate at base; panicles terminal and lateral, compound; 

 spikelets somewhat raceipose; abortive flower without an upper palea. 

 P. dichotomijlorum Mich. P. geniculatum Muhl. 



Wet meadows. N. Y. to Geor. Aug., Sept. (T). — Culm 1 — 3 feet long, stout 

 and somewhat succulent. Leaves 8 — 12 inches or more in length. Pdnicles 

 large and pyramidal. Proliferous Panic-grass. 



16. P. longifolium l^oir. : very smooth ; culm compressed, erect, simple, 

 slender ; leaves very long and narrow ; panicle simple, elongated, racemose ; 

 spikelets acuminate ; abortive flower with 2 palese. 



Pine Barrens. N.J. Sept., Oct. %. — Culm about 2 feet high. Leaves a 

 foot or more long, very narrow. Panicle few-flowered. 



Long-leaved Panic-grass. 



17. P. Crus-Gdlli Linn. : spikes alternate and in pairs, simple or com- 

 pound ; spikelets imbricate ; glumes and outer paleae of the neutral flower 

 hispid, awned or mucronate ; rachis hispid, about 5-angled ; sheaths 

 smooth. Oplismenus Crus-Galli Kunth. 



var. hispidum Torr. : sheaths hispid ; awns very long, P. hispidum Muhl. 



Wet places, near barn-yards, &c. N. Y. to Car. Aug., Sept. (I). — Culm 

 2 — 4 feet high, terete, smooth. Leaves rather broad, flat, serrulate on the mar- 

 gin. Panicle dense, pyramidal, with the spikelets in dense spike-form racemes. 

 The rough variety is often found near salt water. Introduced ? 



Cock's-foot Panic-grass. 



12. SETARIA. i?m%r.— Bristle Grass. 



(From the Latin seta, a hrisUe ; in allusion* to the bristly involucres of the 

 spikelets.) 



Spikelets 2-flowered, invested with an involucre of 2 or more 

 bristles. Glumes 2, unequal, herbaceous. Lower flower abor- 

 tive ; palese 1 oi* 2, herbaceous. Upper flower perfect ; paleae 

 cartilaginous. — Flowers in a compound cylindric spike. 



1. /S. viridis Beauv.: spike cyHndric ; involucre of 4 — 10 fasciculate 

 bristles, much longer than the spikelets ; paleae of the perfect flower longi- 

 tudinally striate, dotted ; margin of the sheaths hairy. Panicum viride 

 Linn. Pennisetum viride Broion. 



Cultivated grounds. N. Y. and Mass. to Car. W. to Ohio, July, Aug. (1).-- 

 Culm 2 — 3 feet high, erect, mostly simple. Leaves linear, flat, roughish. Spike 

 terminal, 2 — 3 inches long, green ; the rachis hairy. Probably a naturalized 

 foreigner. Green Bristle-grass. 



