174 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



pubescent; fruit 1.8 to 1.9 mm. long, 1.1 to 1.2 wide, obscurely puberulent at the 

 apex. 



Autumnal form bushy-branching, erect or topheavy, the blades involute; spikelets 

 more turgid, the attenuate base in exceptional specimens elongated, lengthening the 

 spikelet to as much as 2.8 mm. 



The vernal form of this species can be distinguished from P. aciculare by the larger 

 spikelets and longer blades, from P. angustifolium by the smaller spikelets and the 

 ascending branches of the panicle; the autumnal form is distinguished by the invo- 

 lute blades, longer than those of P. aciculare. 



The following specimens have spikelets with lengthened bases: Florida: Eustis, 

 Nash 598, 1436; Lake City, Chase 4281; Gainesville, Chase 4211. Mississippi: Biloxi, 

 Tracy 3632. An exceptional specimen, with beaked spikelets 2.9 mm. long, Chase 

 4161, Myers, Florida, is doubtfully referred here. 



DISTRIBUTION. 



Sandy pine woods, mostly near the coast, from North Carolina to Florida, Arkansas, 

 and Texas; also in Guatemala. 



North Carolina: Near Wilmington, Chase 3120, 3143, 3156, 4581, Hitchcock 350; 



Raleigh, Chase 3082^. 

 South Carolina: St. Helena 



Island, Cuthbert in 1899; 



Orangeburg, Hitchcock 352; 



Isle of Palms, Hitchcock 351. 

 Georgia: Millen, Harper 757. 

 Florida: Duval County, Curtiss 



3583* in part, 3587* in part, 



4028; Lake City, Chase 4291, 



Combs 164, Hitchcock 1012; 



Monticello, Combs 300; Leon 



County, Curtiss B; Citrus 



County, Combs 1022; Mary 



Esther, Tracy 9144; Gaines- 

 ville, Chase 4249; Ormond, Hitchcock 108. 

 Mississippi: Biloxi, Chase 4340, Hitchcock 1077, Kearney 215 in part. 

 Arkansas: Fulton, Bush 2522. 

 Louisiana: Breton Island, Tracy 459, 459a; Lake Charles, Chase 4423;Tangi- 



pohoa, Cocks 3322. 

 Texas: Houston, Eggert in 1899 (Mo. Bot. Gard. Herb.). 

 Guatemala: Between Gualan and Copan, Pittier 1805b. 



97. Panicum ovinum Scribn. & Smith. 



P. redivivumTrm.; Steud. Norn. Bot. ed. 2. 2 : 262. 1841. This is a nomen nudum, 

 and appears as P. redivivum " Trin. mpt. Mexico." The type, in the Berlin Herba- 

 rium, was collected by Schiede at Hacienda de la Laguna, Mexico. 



Panicum ovinum Scribn. & Smith, U. S. Dept. Agr. Div. Agrost. Circ. 16 : 3. 1899. 

 "Type collected by F. W. Thurow, Waller County, Texas, May 25, 1898." The type 

 specimen, in the National Herbarium, the vernal form, is glabrous except the ciliate 

 basal portion of some of the lowermost blades. 



Fig. 167.— Distribution of P. aremcoloii.es. 



DESCRIPTION. 



Vernal form with culms usually few in a cluster, erect or nearly so, glabrous, 30 to 

 50 cm. high; sheaths glabrous or the lowermost appressed pubescent; blades erect or 

 ascending, stiff, glabrous, the lower somewhat ciliate on the margin at base, the lower- 



