HITCHCOCK AND CHASE NOKTH AMERICAN PANICUM. 



193 



Mississippi: Starkville, Tracy 1755; Enterprise, Tracy 3273; Meridian, Tracy 3253; 



Fairport, Tracy 3204, 3209; Nicholson, Kearney 367, 384; Biloxi, Tracy 2028, 



2050. 

 Louisiana: Calhoun, Hitchcock 1262, 1292; Shreveport, Hitchcoch 1240, 1246, 1251; \'^ S; 



Calcasieu, Langlois 42 in 1884. 

 Texas: Hardin County, Nealley in 1892; Beaumont, Reverchon 4155, 4158. 



\/llO. Panicum. barbulatum Michx. 



Panicum barbulatum Michx. Fl. Bor. Amer. 1: 49. 1803. "Hab. in Carolina." 

 In the Michaux Herbarium « is a sheet upon which are three specimens and two labels. 

 One label reads "Panicum barbulatum Hab. in Canada P. capillari affine. Ad ripas 

 amnis: Rivierre a Jacques Cartier dicti legi," the other *'Rivierre a Jacques Cartier 

 Route a Queb. P. barbulatum." The two larger plants are the vernal form of the 

 species described below, and do not belong to the species to which the name P. barbu- 

 latum has been heretofore applied in our Manuals. & The third plant upon this sheet 

 is a small specimen of P. lindheimeri Nash. The only Carolina specimen from Michaux 

 labeled P. barbulatum is one in the Drake de Castillo Herbarium sent out by Richard. 

 This is labeled "Caroline," but since the specimen, which is P. ashei, has glabrous 

 nodes, and hence does not agree with Michaux's description, it is rejected and the above 

 specimens with bearded nodes from Canada are chosen as the type. 



Panicum dichotomum barbulatum Wood, Class-book ed. 3. 786. 1861. This is pre- 

 sumably based on P. barbulatum Michx., though no synonymy is cited. The descrip- 

 tion given applies to P. microcarpon. 



Panicum pubescens barbulatum Britton, Cat. PI. N. J. 280. 1889. Presumably 

 based on P. barbulatum Michx., no synonymy nor description being given. 



Panicum nitidum barbulatum Chapm. Fl. South. U. S. ed. 3. 586. 1897. Based on 

 P. barbulatum Michx., though the description applies to P. microcarpon. 



Panicum gravius Hitchc. & Chase, Rhodora 8: 205. 1906. "Type Chase 3620; 

 forming top-heavy tufts, in sandy, rather dry woods, on the old Commons farm, 

 between Centreville and Mt. Cuba, Delaware, July 30, 1906; collected by Agnes 

 Chase. Deposited in National Herbarium." 



The name barbulatum is misspelled "barbatum" by Persoon,c and "barbatulum" 

 by Roemer and Schultes,<^ the latter spelling being gi.ven 

 by Steudel « under P. boscii (page 253), P. deustum (page 

 255), and P. sphaerocarpon (page 263). 



description. 



Vernal form in large tufts; culms slender, 50 to 80 cm. 

 high, erect, or spreading at the pummit, lower nodes usu- 

 ally bearded; sheaths glabrous except a puberulent ring 

 at the summit, the lower usually softly pubescent; blades 

 spreading, 6 to 10 cm. long, 6 to 10 mm. wide (the lower 

 shorter), acuminate, rounded at the base, glabrous, the lower rarely puberulent; 

 panicles long-exserted, 6 to 11 cm. long, as wide or wider, the slender, fiexuous 

 branches fascicled, the lower spreading or drooping at maturity, spikelet-bearing at 



a See Hitchcock, Contr. Nat. Herb. 12 : 143. 1908, for an account of the American 

 grasses in the Michaux Herbarium. 

 b See P. microcarpon, page 181. 

 c Syn. PI. 1 : 84. 1805. 

 d Syst. Veg. 2 : 447. 1817. 

 e Nom. Bot. ed. 2. 2 : 253, 255, 263. 1841. 



41616°— VOL 15—10—13 



Fig. 193.— p. barbulatum. 

 From type specimen. 



