308 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



DISTRIBUTION. 



Sandy pine woods or hammocks, southeast Virginia to northern Florida and west 

 to Mississippi. 



Virginia: Cape Henry, Chase 5437 , Hitchcock 429 . 



North Carolina: Wards Mill, 

 Chase 3189; Wilmington, Chase 

 3154, Hitchcock 573, 1465. 



Georgia: Stone Mountain, Hitch- 

 cock 430; Clarke County, Har- 

 per 147; Coffee County, Harper 

 1435; Thomson, Bartlett 1508. 



Florida: Lake City, Chase 4290, 

 Hitchcock 1015, 1035; Madison, 

 Combs 224; Monticello, Combs 

 299, 307; Bay Head, Combs 

 653; Gainesville, Combs 740. 



Alabama: Gateswood, Tracy 8424. 



Mississippi: Biloxi, Kearney 336, Tracy 3646; Mississippi City, Hitchcock 1103; 

 Bayou Gravelin, Tracy 4573 (Field Mus. Herb.). 



Fig. 347.— Distribution of P. mutabile. 



186. Panicum joorii Vasey. 



Panicum leiophyllumFoum. Mex. PI. 2 : 20. 1886, not Nees, 1829. The only speci- 

 men cited is "In valle Cordovensi, januario (Bourg[eatj] absque n.)." This name 

 was earlier listed by Hemsley a without description. The type, in the Paris Herba- 

 rium, consists of several primary culms beginning to branch, the culms puberulent, 

 the largest blades about 8 cm. long and 12 mm. wide. 



Panicum joorii Vasey, U. S. Dept. Agr. Div. Bot. Bull. 8: 31. 1889. "Louisiana 

 (Dr. J. F. Joor)." The type, in the National Herbarium, is a clump of several autum- 

 nal culms, branching at all the nodes, the primary summits mostly fallen and replaced 

 by branches bearing fascicled branchlets, the primary blades as much as 16 cm. 

 long and 18 mm. wide, more or less falcate. The accompanying label reads : ' ' Panicum 

 Joorii, Creek bank, in dense tufts ! near Baton Rouge, La. Oct. 1, '85. No. 39 Legit 

 J. F. Joor, M. D." 



Panicum manatense Nash, Bull. Torrey Club 24:42. 1897. "Collected by the 

 writer on August 21, 1895, near a sulphur well in a wet hammock northeast of Pal- 

 metto, Manatee County, Florida, no. 2428a." The type, in Nash's herbarium, is a 

 clump of early autumnal culms branching from all the nodes, the largest primary 

 blades being scarcely 8 cm. long and 15 mm. wide, somewhat falcate. 



description. 



Vernal form rather pale grayish green; culms in clumps of few to many, 20 to 55 cm. 

 high, slender, spreading or ascending from a decumbent base, glabrous or rarely puber- 

 ulent, at least the lower internodes purplish red; sheaths shorter than the internodes, 

 ciliate, otherwise glabrous or rarely puberulent between the nerves; ligules nearly obso- 

 lete; blades ascending or spreading, 6 to 15 cm., rarely 18 cm. long, 7 to 18 mm. wide, 

 thin but firm, often subfalcate, acuminate, narrowed toward the rounded base, usually 

 ciliate at base, otherwise glabrous; panicles short-exserted, 5 to 9 cm. long, about 

 two-thirds as wide, loosely flowered, the branches ascending or spreading; spikelets 

 3 to 3.1 mm. long, 1.2 to 1.3 mm. wide, elliptic, abruptly short-pointed, pubescent; 

 first glume one-third to two-fifths as long as the spikelet, acute; second glume and 



a Biol. Centr. Amer. Bot, 3 : 490. 1885. 



