426 



Moist meadows. N. Y. to Virg. July Sept, '^. Culm 23 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 racemose; abortive flower without an upper palea. 

 P. dichotomiflorum, Mich. P. genicuLatum Muhl. 



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

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

 large and pyramidal. Proliferous Panic-grass. 



16. P. longifolium Torr. : very smooth; culm compressed, erect, simple, 

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

 spikelets acuminate ; abortive flower with 2 paleae. 



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

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



Long-leaved Panic-grass. 



17. P. Cms- Gcdli Linn. : spikes alternate and in pairs, simple or com- 

 pound : spikelets imbricate ; glumes and outer pales 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. (1). 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. JBeauv. Bristle Grass. 



(From the Latin seta, a bristk ; 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 or 2, herbaceous. Upper flower perfect ; paleae 

 cartilaginous. Flowers in a compound cylindric spike. 



1 . riridis Beauv. : spike cylindric ; involucre of 4 1 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 Brown. 



Cultivated grounds. N. Y. and Mass, to Car. W. to Ohio. July, Aug. . 

 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 Bristh-grast. 



