190 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
New Hampsuire: Jaffrey, Hitchcock 120, Robinson 338, 338a; White Mountains, 
Hitchcock 121. 
VERMONT: Brattleboro, Jones 33. 
MassacuuseEtts: Framingham, Smith 733; South Hadley, Cook in 1887. 
Connecticut: Southington, Bis- 
sell 5582; Griswold, Graves 77; 
Waterford, Graves 82. 
New York: Cairo, Nash in 1893; 
Fulton Chain, Peck 2, 2a, 3. 
Ontario: Almonte, Fowler in 
1898; Algonquin Park, Macoun 
22022. 
New Jersey: Budds Lake, Mac- 
kenzie 2093; Cranberry Lake, 
Mackenzie 2109. 
Onto: Wauseon, Kellerman in 
1899 (Ohio State Univ.). 
Inprana: Gibson, Bebb 2935, Hill 97 in 1908; Griffith, Hill 50 in 1909. 
Micuigan: Keweenaw County, Farwell 643; shore of Lake Superior, Wood in 1884. 
Wisconsin: Tomahawk, Cheney 2100; Newbold, Cheney 1700; Granite Heights, 
Cheney 3088. 
Minnesota: Hennepin County, Sandberg in 1890 (Univ. Minn. Herb.). 
Fia. 190.—Distribution of P. boreale. 
109. Panicum dichotomum L. 
Panicum dichotomum L. Sp. Pl. 58.1753. ‘‘Habitat in Virginia.’ Since Linnzeus 
gives no description of his own, but quotes the diagnosis from Gronovius’s Flora Vir- 
ginica,? the type of this species is Clayton no. 458 which is the specimen cited by 
Gronovius,® and upon which his diagnosis is based. This specimen, preserved in the 
Gronovius Herbarium, is the autumnal form answering well to Gronovius’s character- 
ization, ‘‘vix pedale, in arbusculae formam excrescens.’’ The specimen in the Lin- 
nean Herbarium collected by Kalm is P. microcarpon. 
Panicum angustifolium LeC, in Torr. Cat. Pl. N. Y. 91. 1819, not Ell. 1816. No 
specimen nor locality is cited. A vernal specimen in the Torrey Herbarium penciled 
‘“‘angustifolius (nitid. var)’’ but without data may be the type. 
Panicum tremulum Spreng. Neu. Entd, 2: 103. 1821. ‘Panicum n. 39. Mihlenb. 
gram. p. 127.* In Nova Caesarea.’’ [The * indicates a new species.] No locality 
is cited by Muhlenberg, and this number does not now exist in the Muhlenberg Her- 
barium. In the Sprengel Herbarium is a specimen consisting of a vernal culm with 
mature panicle, which bears a label ‘‘Panicum tremulum Spr. Hb. Spr. Torrey.”’ 
A second label reads ‘‘Panicum tremulum* Miihlenb. gram. p. 127.’’ Though no 
locality is given this specimen is doubtless the basis of the locality cited by Sprengel, 
and may be considered his type, since he gives a description and had not seen Muhlen- 
berg’s plant. ; 
Panicum dichotomum viride Vasey, U. S. Dept. Agr. Div. Bot. Bull. 8:30. 1889, 
No locality nor specimen is cited. The diagnosis reads ‘Smooth all over, leaves light 
green and narrower.’’ In the National Herbarium are four specimens marked “var. 
aF]. Virg. 2: 133. 1743. 
bSee Hitchcock, Contr. Nat. Herb, 12: 127. 1908, for an account of the grasses of 
Gronovius’s Flora Virginica. 
¢See Hitchcock, Contr. Nat. Herb. 12:114. 1908, for an account of the American 
grasses in the Linnzan Herbarium. 
