224 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
surface velvety with copious long, silky hairs intermixed, especially toward the base, the 
lower surface silky-villous or velvety, the nerves somewhat conspicuous; panicles short- 
exserted, 3to5 cm. long, about as wide, the axis velvety, with long, silky hairs inter- 
mixed, the flexuous branches ascending or spreading; spikelets 1.3 to 1.4 mm. long, 
0.8 to 0.9 mm. wide, obovate, very turgid, densely papillose-pubescent; first glume 
one-third to half the length of the spikelet, acute; second glume and sterile lemma 
equal and covering the fruit at maturity; fruit 1.1 to 1.2 mm. long, 0.8 mm. wide, 
obovate-elliptic, minutely pointed. 
Autumnal form early becoming diffusely branched at all the nodes, prostrate- 
spreading, forming large mats, the branches curved upward at the ends; earlier branches 
longer than the primary internodes, the ultimate branchlets in short fascicles with 
involute-pointed blades 1 to 2 cm. long, the numerous turgid little spikelets clustered 
at their bases; winter rosette appearing rather late, the lanceolate blades silky-villous 
like those of the primary culm. 
The vernal form resembles that of P. lanuginosum but is smaller, more slender and 
more silky-villous, with smaller, more 
turgid spikelets; the prostrate autumnal 
form with upturned branch tips is 
characteristic. 
DISTRIBUTION. 
Sandy pine and oak woods of the 
Coastal Plain from Virginia to Florida, 
and west to Louisiana. 
Virainia: Cape Henry, Chase 2341; 
Virginia Beach, Mackenzie 
1733, Williams 3097, 3105; 
Dismal Swamp, Chase 3680. 
Norra Caroura: Wilmington, Chase 3132, 4579, Hitchcock 1482; Cumberland 
County, Stevens 6425. 
SoutH Carona: Orangeburg, Hitchcock 10. 
GeoratA: Bainbridge, Curtiss 6811; Thomson, Bartlett 1172. 
Frorma: De Funiak Springs, Combs 440. 
ALABAMA: Gateswood, Tracy 8430 in part; Auburn, Earle & Baker 1527. 
LovurstaANa: Shreveport, Cocks 3506. 
Fig. 231.—Distribution of P. auburne. 
129. Panicum thurowii Scribn. & Smith. 
Panicum thurowii Scribn. & Smith, U.S. Dept. Agr. Div. Agrost. Cire. 16: 5. 1899. 
“Named for Mr. F. W. Thurow, by whom it was collected in Waller County, Texas, 
June 5, 1898, No. 9.” The type, in the National 
Iferbarium, consists of one simple culm and one 
beginning to branch, about 40 cm. high, with 
short-exserted, nearly mature panicles, 
DESCRIPTION. 
Vernal form bluish green, but drying olive; 
culms tufted, 35 to 70 cm. high, erect or ascend- 
ing, villous, the nodes bearded with spread- 
ing hairs, usually a glabrous ring below; sheaths 
long, the lower often overlapping, the upper shorter than the internodes, sparsely 
or rather densely villous; ligules 4 mm. long; blades rather stiff, ascending 
or spreading, 7 to 12 cm. long, or the uppermost only 2 to 3 cm. long, 6 to 10 mm. 
Pia, 232.—P, thurowii. From 
type specimen. 
