HITCHCOCK AND CHASE — NORTH AMERICAN PANICUM. 261 



Fig. 284. — Distribution of P. albomarginatum . 

 Tracy 6733; Manatee, Rugel 184; Myers, 



DISTRIBUTION. 



Low sandy soil of the Coastal Plain, from southeastern Virginia to Florida and west 

 to Louisiana; also in Guatemala and Cuba. 

 Virginia: Dismal Swamp, Chase 3658. 

 North Carolina: Parmele, Ashe in 1899; Wilmington, Hitchcock 1428, 1429, 



1434, 1440, Kearney 268. 

 South Carolina: Orangeburg, Hitchcock 1369, Aiken, Ravenel. 

 Florida: Baldwin, Hitchcock 990; Lake City, Combs 112, Hitehcock 1021, 1022; 



Bay Head, Combs 650; Old 



Town, Combs 854; Perdido 



Bay, Tracy 8409; Titusville, 



Chase 3966, Hitchcock 761; San- 

 ford, Hitchcock 768, 823, 826; 



Eustis, Chase 4043, Hitchcock 



817, Nash 925; Orange County, 



Baker 119; Lemon Bay, Tracy 



7189; Miami, Hitchcock 639, 



666, 667, 670, 679, 714, 720; 



Homestead, Hitchcock 692; 



Tampa, Hitchcock 945; Lake- 

 land, Hitchcock 838, 839, 848; 



Braidentown, Hitchcock 949, 963, 



Chase 4151, Hitchcock 870, 876, 880, 882, 884, 886. 

 Alabama: Tuskegee, Carver 97 '. 

 Mississippi: Biloxi, Tracy 4605 in part (Gray Herb.). 

 Louisiana: Calcasieu River, Langlois 42 in 1884. 

 Guatemala: Between Gualan and Cop&n, Pittier 1805a. 

 Cuba: Herradura, Hitchcock 555; Pinar del Rio, Wright 3463 in part (Sauvalle 



Herb.); Isle of Pines, Taylor 32. 



154. Panicum trifolium Xash. 



Panicum trifolium Nash, Bull. Torrey Club 26: 580. 1899. "Type collected by 

 Dr. John K. Small, in the Ocmulgee River Swamp, below Macon, Georgia, May 18-24, 

 1895." The type, in Nash's herbarium, consists of two tufts of slender vernal culms, 

 25 to 40 cm. high, with leafy bases and elongated internodes, the rather short-exserted 

 panicles immature. 



description. 



Vernal form similar to that of P. albomarginatum, but the culms in smaller tufts, 

 taller, 20 to 50 cm. high, more slender, erect; leaves less conspicuously crowded at 

 the base, not so stiff, and proportionately not so much longer than those of the mid- 

 culm; sheaths much shorter than the elongated internodes; 

 blades 3 to 5 cm. long, 4 to 5 mm. wide, rather less thick 

 and firm than those of P. albomarginatum, the uppermost 

 blade not reduced; panicles usually short-exserted, 3 to 5 cm. 

 long, about as wide, loosely flowered; spikelets as in P. 

 albomarginatum but hardly as wide or as turgid, and the 

 fruit rather less exposed at maturity. 



Autumnal form erect or leaning, sparingly branching 

 from the middle and upper nodes, the branches usually 

 shorter than the primary internodes. 



This species is very closely allied to the preceding and some vernal specimens are 

 but doubtfully separated from it. Autumnal specimens may be distinguished by the 

 small fascicles of short branches scattered along the slender primary culm. 



Fig. 285.— P. trifolium. From 

 type specimen. 



