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: FLoripa: Eustis, 
Jash 598, 1436; Lake City, Chase 4281; Gainesville, Chase 4211. Mussissrppr: 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. 
Norra Carouna: Near Wilmington, Chase 3120, 3143, 3156, 4581, Hitchcock 350; 
Raleigh, Chase 30824. 
SourH Carona: St. Helena 
Island, Cuthbert in 1899; 
Orangeburg, flitchcock 352; 
Isle of Palms, Hitchcock 351. 
Georata: Millen, Harper 757. 
Fioripa: 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. 
LourstaNa: Breton Island, Tracy 459, 459a; Lake Charles, Chase 4423; Tangi- 
pohoa, Cocks 3322. 
Texas: Houston, Eggert in 1899 (Mo. Bot. Gard, Herb.). 
GUATEMALA: Between Gualin and Copan, Pittier 1805b. 
Fic. 167.—Distribution of P. arenicoloides. 
97. Panicum ovinum Scribn. & Smith. 
P. redivivum Trin.; Steud. Nom. 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. 8. Dept. Agr. Div. Agrost. Cire. 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. 
DESCRIPTION, 
Vernal form with culms usually few in a cluster, erect or nearly so, glabrous, 30 to 
50 em. 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- 
