HITCHCOCK AND CHASE TROPICAL NORTH AMERICAN PANICUM. 519 



93. Panicum. "WTightianuni Scribn. 



Panicum wrightianum Scribn. U. S. Dept. Agr. Div. Agrost. Bull. 11: 44./. 4. 1898. 

 Contr. U. S. Nat. Herb. 15: 207. 

 1910. 



DISTRIBUTION. 



Moist sandy soil, Massachusetts to 

 Texas and Cuba. The type specimen 

 from Cuba. 



Cuba: Pinar del Rio, Britton & 



Gager 6952. Without locality, 



Wright 3463 in part. 



Fig. 119.— Distribution of P. wrighiianum. 



LANUGINOSA. 



Spikelets 2.2 mm. or more long. 



Pubescence on culms horizontally spreading; autumnal 



form freely branching 97. P. villosissimum. 



Pubescence on culms appressed or ascending; autumnal 



form rather sparingly branching 98. P. pseudopubescens. 



Spikelets not over 2 mm. long. 



Plants not velvety; blades usually glabrous on the upper 



surface 94. P. tennesseense. 



Plants velvety; blades softly pubescent on both surfaces. 



Plants light or yellow green when dry 95. P. acuminatum. 



Plants dark or olive green when dry 96. P. olivaceum. 



94. Panicum tennesseense Ashe. 



Panicum tennesseense Ashe, Journ. Elisha 

 Mitchell Soc. 15: 52. 1898; Contr. U. S, 

 Nat. Herb. 15: 218. 1910. 



DISTRIBUTION. 



Open ground, Atlantic States to Utah; 

 also in southern Mexico. The type speci- 

 men from Tennessee. 



Veracruz: Orizaba, Botteri 101. 



-. .n« T^• , T. *• ^ r. . Jalapa, Hitchcock Q%Z2. 



Fig. 120.— Distribution of P. tennesseense. ^ 



95. Panicum acuminatum Swartz. 



Panicum acuminatum Swartz, Prodr. Veg. Ind. Occ. 23. 1788; Contr. U. S. Nat. 

 Herb. 15: 222. 1910. 



Panicum ornalum Dcsv.; Hamilt. Prodr. PI. Ind. Occ. 11. 1825. "Herb. Prof. 

 Desv. Porto Rico." 



In the Revision' this was listed among the doubtful species. The inadequate 

 description indicates the common P. acuminatum. 



» Contr. U. S. Nat. Herb. 15: 331. 1910. 



