HITCHCOCK AND CHASE NOKTH AMERICAN PANICUM. 317 



North Carolina: 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. 



191. Panicum boscii Poir. 



Panicum boscii Poir. in Lam. Encycl. Suppl. 4: 278. 1816. "Cette plante a ete 

 recueillie a 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 

 boscii poir. enc. Suppl. (scr. Poiret.) Amer. Sept. a 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. in Herb. Mich.)." The specimen in the Michaux Herbarium 

 under the name of P. latifolium, and labeled "in pratis sylvestris Virginias Caro- 

 lina?," is a somewhat pubescent autumnal specimen of P. boscii. Scribner a uses 

 this name (as P. walteri Poir.) for P. boscii. 



Panicum latifolium australis[e] Vasey, U. S. 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 Linnaeus, 

 1753. Panicum Walteri Poir. in Lam. Encycl. Suppl. 4: 282. 1816. Not Pursh, 1814. 

 Panicum latifolium var. molle Vasey, Bull. Bot. Div., U. S. Dept. of Agric. 8: 33. 

 [error for 34] 1889." No description is given. In Walter's Flora Linnaeus's diagnosis 

 of 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, doubtfully 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. walteri 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., c it is more fitting also that the name P. porterianum be based on the name which 

 he applied to this form, that is, P. walteri 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. 



& For an account of the grasses in Walter's herbarium see Hitchcock, Rep. Mo. Bot. 

 Gard. 16 : 36. 1905. 

 cBull. Torrey Club 20: 194. 1893. 



