298 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Autumnal form branching from the middle nodes, the branches more or less divari- 
cate, not much crowded, the blades not greatly reduced, the ultimate panicles wholly 
or partially included in the sheaths. 
This species is allied to P. scabriusculwm, but the panicles are smaller, more open, 
fewer-flowered, the axis and branches 
scarcely viscid, the spikelets larger 
and the glumes only slightly exceed- 
ing the fruit. Vernal plants bear a 
superficial resemblance to P. clandes- 
tinum. 
DISTRIBUTION. 
Swampy woods, Long Island, New 
York, District of Columbia, and North 
Carolina; rare. 
. Fic. 337.—Distribution of P. aculeatum. 
New Yorx: Rockville Center, 
Bicknell in 1903; Hempstead, Bicknell in 1906. 
District or CoLuMBIA: Chase 2520, 5439, House 1041 (Hitchcock Herb.). 
Nortu Carona: Lake Mattamuskeet, Chase 3210. 
181. Panicum scabriusculum El. 
Panicum scabriusculum Ell. Bot. 8. C. & Ga. 1: 121.1816. “Sent to me from 
Savannah by Dr. Baldwin.’’ The type, in the Elliott Herbarium, consists of the 
upper part of a culm with one leaf and a large over-mature panicle. The accompany- 
ing label reads: ‘‘ Panicum scabriusculum. Hab: Georg: Dr. Baldwin.’’ 
Panicum lanuginosum Bosc; Spreng. Syst. Veg. 1: 319. 1825, not Ell. 1816. 
‘“‘Georgia.’”’ The type is in the Willdenow Herbarium. 
Panicum eriophorum Schult.;¢ Kunth, Enum. Pl. 1: 128. 1833. Based on P, 
lanuginosum Bosc, the description of which is copied. 
Panicum nealleyi Vasey, Bull. Torrey Club 13: 25. 1886. ‘‘Collected in Texas by 
Mr. G. C. Nealley.’’ The type, in the National Herbarium, is a vernal specimen. 
It was collected in Texas, May, 1885, the exact locality not being given. 
Panicum dichotomum elatum Vasey, U.S. Dept. Agr. Div. Bot. Bull. 8: 31. 1889. 
No locality nor specimen is mentioned by Vasey. The only specimen in the National 
Herbarium bearing this name in Vasey’s writing is one of P. scabriusculum in the 
early branching state. This specimen agrees with Vasey’s description and is taken 
as the type. It was collected by Charles Mohr in Mobile County, Alabama, June 18, 
1888. 
DESCRIPTION. 
Vernal form grayish olive green; culms erect, | to 1.5 meters high, scabrous at least 
below the nodes, sometimes puberulent, the nodes glabrous or puberulent; sheaths 
shorter than the internodes, glabrous to more or less hispid at least toward the sum- 
mit, often mottled or white-spotted, commonly swollen at the base and contracted 
toward the summit; ligules short-membranaceous, usually with a ring of hairs above; 
blades stiffly ascending or spreading, often reflexed, 15 to 25 cm. long, 9 to 12 or rarely 
15 mm. wide, glabrous or scabrous, often more or less pubescent beneath, gradually 
tapering to an involute point, slightly narrowed toward the base; panicles finally 
exserted, 10 to 20 cm. long, half to two-thirds as wide, rarely wider, many-flowered, the 
@ Kunth cites “Schult, Mant. 3. 591” as place of publication, but neither the second 
nor third volume of Schultes’s Mantissa contains a page 591, nor is this name in either 
volume. 
