HITCHCOCK AND CHASE—-NORTH. AMERICAN PANICUM. 317 
Norta Carona: Magnetic City, Wetherby 53; Blowing Rock Mountain, Small 
& Heller 394; Biltmore, Hitchcock 588; Linville, Hitchcock 589; Grandfather 
Mountain, Hitchcock 433. 
Kentucky: Lexington, Short 5 (Gray Herb.). 
TENNESSEE: Roan Mountain, Hitchcock 586. 
~el 191. Panicum boscii Poir. 
Panicum boscit Poir. in Lam. Encycl. Suppl. 4: 278.1816. ‘‘Cette plante a été 
recueillie & la Caroline par M. Bosc. (V.s.in herb. Desfont.).’? The type, in the 
Desfontaines Herbarium, consists of three early autumnal culms, the blades nearly 
glabrous, the spikelets 4.1 mm. long. The accompanying label reads ‘‘ Panicum 
bosceii poir. enc. Suppl. (scr. Poiret.) Amer. Sept. 4 Bosc.”’ 
Panicum waltheri Poir. in Lam. Encycl. Suppl. 4: 282. 1816, not P. walteri Pursh, 
1814. Based on “Panicum latifolium Mich. Flor. bor. Amer. 1. pag. 49.—Non 
Linn. * * * (V.s.%n Herb. Mich.).”’ The specimen in the Michaux Herbarium 
under the name of P. latifoliwm, and labeled ‘‘in pratis sylvestris Virginis Caro- 
line,’’ is a somewhat pubescent autumnal specimen of P. boscii. Scribner @ uses 
this name (as P. waltert Poir.) for P. boscit. 
Panicum latifolium australis[e] Vasey, U. 8. Dept. Agr. Div. Bot. Bull. 8: 34. 1889. 
“Alabama to Texas.’’ The type, in the National Herbarium, consists of two vernal 
culms, the sheaths and blades glabrous or nearly so, the spikelets 4.3 mm. long. The 
specimen was collected by Dr. Charles Mohr, at Thomasville, Clark County, Ala., 
April 16, 1888. 
Panicum porterianum Nash, Bull. Torrey Club 22: 420. 1895. The author pro- 
poses a new name for ‘‘ Panicum latifolium Walt. Fl. Car. 73. 1788. Not Linnzeus, 
1753. Panicum Walter Poir. in Lam. Encycl. Suppl. 4: 282. 1816. Not Pursh, 1814. 
Panicum latifolium var. molle Vasey, Bull. Bot. Div., U. 8. Dept. of Agric. 8: 33. 
[error for 34] 1889.”’ No description is given. In Walter’s Flora Linnzeus’s diagnosis 
ot P. latifolium is copied with no additional description, and there is no specimen in 
Walter’s herbarium © labeled P. latifolium by Walter. A fragmentary panicle and 
two leaves, doubtiully referable to P. commutatum Schult., labeled ‘‘ Panicum 469,” 
possibly may be the specimen to which Walter applied the name. In the absence of 
an authentic specimen, and because P. latifolium Walt. must be considered a misappli- 
cation of P. latifolium L., P. porterianum is here regarded as based upon the next 
name cited, P. waltert Poir. Since the name was given in honor of Dr. Porter, doubt- 
less because of his distinguishing this form from what he understood to be P. latifolium 
L.,¢ it is more fitting also that the name P. porterianum be based on the name which 
. he applied to this form, that is, P. wattert Poir. 
This species has been described as P. latifolium L. by many American authors. 
DESCRIPTION. 
Vernal form resembling that of P. latifolium, usually in larger clumps; culms 40 to 
to 70 cm. high, erect or ascending, glabrous or minutely puberulent, rarely somewhat 
papillose, the nodes retrorsely bearded; sheaths much shorter than the internodes, 
ciliate, a pubescent ring at the juncture with the blade, otherwise glabrous or sparsely 
downy-pilose; ligules about 1 mm. long; blades spreading, 7 to 12 cm. long, 1.5 to 3 
cm. wide, more or less tapering toward the sparsely ciliate, cordate base, acuminate, 
glabrous on both surfaces or puberulent on the lower and sparsely pubescent on the 
«Mem. Torrey Club. 5: 32. 1894. 
6 For an account of the grasses in Walter’s herbarium see Hitchcock, Rep. Mo. Bot. 
Gard. 16: 36. 1905. 
¢ Bull. Torrey Club 20: 194. 1893. 
