GRASS FAMILY. 
12. Panicum Porterianum Nash. Porter’s Panicum. 
Panicum latifolium Walt. Fl. Car. 73. 1788. Not L. 
1753+ 
Pann Waltert Poir. in Lam, Encycl. Suppl. 4: 282. 
1816. Not Pursh, 1814. 
Panicum latifolium var. molle Vasey, Contr. Nat. Herb. 
3:33. 1892. Not P. molle Sw. 1788. 
Panicum Porterianum Nash, Bull. Torr, Club, 22: 420. 
1895. 
Culms erect, 1°-2° tall, simple or somewhat dicho- 
tomously branched above, the nodes densely barbed. 
Sheaths generally softly pubescent; leaves ovate to 
broadly lanceolate, 2’-4’ long, '%4’-114’ wide, cordate- 
clasping at base, acute, usually softly pubescent ; pan- 
icle included or somewhat exserted ; branches spread- 
ing or ascending, bearing few elliptic short-pedicelled 
appressed spikelets 2//-214’’ long; first scale one-third 
to one-half as long as the pubescent and equal second 
and third ones; fourth scale about as long as the third. 
In woods, Maine and Ontario to Minnesota, south to 
Florida and Texas. June-Aug. 
(Fig. 254.) 
13. Panicum commutatum Schultes. Variable Panicum. 
Lam. 1797. 
(Fig. 255.) 
Panicum nervosum Muhl. Gram. 
Panicum commutatum Schultes, Mant. 2: 242. 
Culms erect, 1°-2° tall, rather slender, glabrous, 
or pubescent especially at the nodes, simple, finally 
dichotomously branched above. Sheaths glabrous 
or puberulent, generally ciliate; leaves 2/4’ long, 
\(/-1/ wide, sparingly ciliate at the base, acute, 
glabrous or puberulent, those of the branches gen- 
erally broader and more crowded than those of the 
main stem; panicle 2’-5’ long, lax, the branches 
spreading ; spikelets 1/’-114’’ long, ellipsoid ; first 
scale about one-fourth as long as the spikelet, 1- 
nerved ; second and third scales equal, 7-nerved, 
pubescent; fourth scale oval, obtuse, apiculate, 
about 1’ long; palet of third scale usually empty. 
In dry woods and thickets, New York to Kentucky, 
south to Florida and Texas. June-Aug. 
14. Panicum macrocarpon [Le Conte. 
Large-fruited Panicum. (Fig. 256. ) 
Panicum macrocarpon Le Conte; Torr. Cat. 91. 1819. 
Culms 1°-3° tall, erect, simple or somewhat 
branched above, smooth; the nodes, at least the 
upper ones, naked. Sheaths smooth and glabrous, 
ciliate ; leaves 3/-7’ long, 9’’-1%4’ wide, cordate- 
clasping at base, acuminate, smooth and glabrous 
or nearly so on both surfaces, ciliate ; panicle 3/—6’ 
long, generally long-exserted, rarely included, its 
branches more or less ascending ; spikelets 1 14//—2/’ 
long, turgid, oval to obovoid; second and third 
scales broadly oval, obtuse, g-nerved, pubescent, 
the fourth oval, rather acute, 114’ long. 
The more simple culms, glabrous sheaths, leaves and 
nodes and the turgid spikelets readily distinguish this 
species from either P. Porlerianum or P. clandesti- 
num. Moist places, Vermont to New York, New 
Jersey and Pennsylvania. July—Aug. 
