292 



CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM. 



Fig. 328.— Distribution of P. xanthophysum. 



New York: Oneida Lake, Gray; Lake George, Vasey in 1882; Schenectady, 

 Wibbe in 1885; Danby, Coville in 1885; Cairo, Nash in 1893; Tripoli, Burnham 

 in 1897. 



Ontario: Belleville, Macoun in 1865; Gait, Herriot in 1898 and 1901; Algonquin 

 Park, Macoun 22025. 



Pennsylvania: Tannersville, 

 Brown in 1901; without local- 

 ity, McMinn. 



Michigan: Keweenaw, Farwell 

 764; Alma, Davis in 1893. 



Wisconsin : Rainbow Rapids, Che- 

 ney 1346; Mason, Cheney 4786; 

 Webster, Cheney 3426. 



Minnesota: Ramsey County, Ost- 

 land 1 and 2 in 1884; Lake 

 Kilpatrick, Ballard in 1893; 

 St. Cloud, Campbell 66. 



Manitoba: Lake Winnepeg Valley, Bourgeau in 1857 (Gray Herb.). 



Saskatchawan: Bourgeau in 1858 (Gray Herb.). 



Pedicellata. — Clums slender, more or less hirsute; ligules of short hairs; blades not 

 over 6 mm. wide, ciliate; spikelets 3.5 to 4 mm. long, attenuate at base, 

 papillose, 7 to 9-nerved. Autumnal form freely branching, the branches 

 appearing before the maturity of the primary panicle; no distinct winter 

 rosette formed. 



This group of two species appears to be intermediate between the subgenus 

 Dichanthelium and true Panicum. The plants bear a general resemblance 

 to Oligosanthia but in the absence of a winter rosette and in the branch- 

 ing habit, especially of P. nodatum, they show a departure from 

 Dichanthelium. 

 Culms erect or leaning; blades thin, 5 to 9 cm. long, narrowed 



toward the base 176. P. pedicellatum. 



Culms decumbent; blades thick, not over 5 cm. long, not nar- 

 rowed toward the base 177. P. nodatum. 



176. Panicum pedicellatum Vasey. 



Panicum pedicellatum Vasey, U. S. Dept. Agr. Div. Bot. Bull. 8 : 28. 1889. "Texas, 

 J. Reverchon." The type specimen, in the National Herbarium, Reverchon Texas 



Plants 1620, bearing the data "Rocky 

 woods, Kimble Co. June," consists of two 

 branching plants. 



DESCRIPTION. 



Vernal form in tufts of few to several 

 erect or ascending culms from a short, 

 knotted rootstock; culms slender, 20 to 

 50 cm. high, usually ascending-hirsute 

 at least below, a few spreading hairs on 

 the nodes; sheaths papillose, sparingly 

 hirsute, ciliate on the margin; ligules 

 dense, about 1 mm. long; blades ascend- 

 ing or spreading, 5 to 9 cm. long, 3 to 6 

 mm. wide, the margin toward the narrowed base sparsely ciliate with long hairs, 

 both surfaces glabrous or sometimes minutely hispid; panicles 3 to 6 cm. long, 



Fig. 329.— P. pedicellatum. From type specimen. 



