Calamovilfa longifolia (Hook. ) Hack. True Grasses, 113. 1890: Calamagrostis 

 loncji folia Hook. Fl. Bor. Am. 241. 1840; Vilfa rigida Buckl. Proc. Acad. 

 Nat. Sci. Phila. 1862 : 89. 1802 ; Ammophila longifolia Bentli. in Vasey, U. S. 

 Dept. Agr. Spec. Kept. 63: 29. 188:1 



This species e-xteiuls from We.stern Ontario and Indiana westward to Wyoming, 

 Montana, Idaho, and southward to Iowa, Nebraska, and Colorado. It is dis- 

 tinguished by its usually contracted panicles and glabrous flowering glume 

 and palca. 



CALAMOVILFA LONGIFOLIA MAGNA var. nov. This variety is dis- 

 tinguished from the species mainly by its large size, 12 to 18 dm. high; in 

 this respect approaching Calainovilfa gigantea, but distinguished from that 

 species by its glabrous spikelets. It is represented in the National Herba- 

 rium by specimens collected on the lake shore at the mouth of the Kalama- 

 zoo River, Mich., by W. A. Taylor in 1894. It is very abundant and valua- 

 ble as a sand binder in the dunes about South Haven and Grand Haven, 



Mich. 



:t. THKKK SKW SPKCIKS OF PAMCUM. 



By F. I.AMSON-ScRiBNER aiid Elmer I). Mkrrill. 



PANICUM (VIRGARIA) BARTOWENSE sp. nov. 



Panicum proliferum pilomm Griseb. PI. Cub. 232. 1860. •>. Not Panicinn pilos- 

 uiu Swartz, 1788, et al. 



A stout, erect annual 12 to 10 dm. high, with very long leaves, tuberculate-hispid 

 sheaths and diffuse panicles 3 to dm. long. Culms simple, glabrous, ."> to 

 7 mm. in diameter below. Sheaths about equaling or somewhat exceeding 

 the iuternodes; ligule a ciliate fringe about 2 mm. long; leaf-blades 4 to 6 

 dm. long, about 10 mm. wide, tapering to the acute apex, scarcely narrowed 

 at the rounded and somewhat clasping base, scabrous on the margins and 

 on the nerves above, glabrous beneath, or often with few scattered papillate 

 hairs on both siirfaces. Panicles pale or purplish, the branches at first erect, 

 finally spreading, the lower ones 3 to 4 dm. long; the primary axis and 

 branches scabrous. Spikelets nearly 2.5 mm. long, narrowly ovate, acute, 

 glabrous : first glume truncate, enclosing the base of the spikelet, less than 

 0.5 mm. long; second and third glumes subequal, acute, slightly exceeding 

 the flowering glume, both 7-nerved, the nerves rather prominent, the third 

 glume subtending a hyaline palea about 1 mm. long ; flowering glume less 

 than 2 mm. long, ovate, acute, smooth and shining. 



Type specimen collected in wet, reclaimed swamps at Bartow, Polk County, Fla. 

 No. 1220, Robert Combs, September 29, 1898; No. 971, Combs, collected in 

 a water ditch at Homosassa, Citrus County, Fla., September 13, 1898, is the 

 same; No. 483, A. S. Hitchcock, collected in inundated fields, Myers, Lee 

 County, Fla. , July-August, 1 900, represents a later stage of the species with 

 a very diffuse, open panicle: No. 5380, A. H. Curtiss, low grounds, Palm- 

 beach, Fla., May 13, 1895, belongs here. 



This species is closely related to Panicum prolifevum Lam., the most striking 



difference being its tuberculate-hispid sheaths and very small first glume. 

 PANICUM SHASTENSE sp. nov. 



A tufted, pubescent perennial about 3 dm. high, with erect or ascending leaves 

 and open, ovate, rather few flowered panicles. Culms geniculate below, 

 pilose with scattered long white hairs ; nodes bearded with spreading or 

 reflexed hairs and with a smooth ring immediately below. Sheaths close, 

 striate, shorter than the internodes, pilose with long spreading hairs ; ligule 

 a ciliate fringe about 2 mm. long; leaf-blades narrowly lanceolate, acute, 

 slightly clasping at the base, 5 to 7 cm. long, to 8 mm. wide, pilose beneath 

 with weak spreading hairs, nearly glabrous above, scabrous on the margins. 



