GRASS FAMILY. 

 12. Panicum Porterianum Nash. 



Porter's Panicum. (Fig. - 



Not L. 



282. 



Panicum latifolium Walt. Fl. Car. 73. 1788. 



1753- 

 Panicum Walter i Poir. in Iam. Encycl. Suppl 4 



1816. Not Pursh, 1814. 

 Pan it tan latifolium var. molle Vasey, Contr. Nat. Herb 



3:;,,?. 1892. Not /'. xiolle Sw. 1788. 

 Panicum Porterianum Xash, Bull. Torr. Club. 22- 430 



1895- 



Culms erect, i-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, %'-i%' wide, cordate- 

 clasping at base, acute, usually softly pubescent ; pan- 

 icle included or somewhat cxserted ; branches spread- 

 ing or ascending, bearing few elliptic short-pedicelled 

 appressed spikelets 2 // -2 / ^ // 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. 



13. Panicum commutatum Schultes. Variable Panicum. (Fig. 255.) 



Panicum neti'osum Mtihl. ('.ram. 116. 1817? Not 



I<ani. 1797. 

 Panicum commutatum Schultc*. Mant 3: 342: 1804. 



Culms erect, i-2 tall, rather slender, glabrous, 

 or pubescent especially at the nodes, simple, finally 

 dichotomously branched 800%%. Sheaths glabrous 

 or puberulent, generally ciliate; leaves tf-\' long. 

 % f -\' 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 i"-itf" long, ellipsoid; first 

 scale about one-fourth as long as the sptkelet. i - 

 nerved ; second and third scales equal. 7-nerved, 

 pubescent; fourth scale oval. ohtu-c. apicuUte, 

 about i" long; palet of third scale usually rtnptr. 



In dry woods and thicks -k to Kentucky, 



south to Florida and Texan. Jnne-Aug. 



14. Panicum macrocarpon Le Conte. 

 Large-fruited Panicum. (Fig. 256. ) 



Panicum macrocarpon I<e Conte; Torr. Cat. 91. 1819. 

 Culms i-3 tall, erect, simple or somewhat 

 branched above, smooth; the nodes, at least the 

 upper ones, naked. Sheaths smooth and glabrous, 

 ciliate; leaves s'-j' long, 9 // -i>^ / 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 I > // -2 // 

 long, turgid, oval to obovoid ; second and third 

 scales broadly oval, obtuse, 9-nerved, pubescent, 

 the fourth oval, rather acute, \y*" long. 



The more simple culms, glabrous sheaths, leaves and 

 nodes and the turgid spikelets readily distinguish this 

 species from either P. Porterianum or P. clandcsti- 

 num. Moist places, Vermont to New York, New 

 Jersey and Pennsylvania. July-Aug. 



