260 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
more pubescent spikelets, the thicker, involute-pointed blades and the large basal 
rosette of firm leaves. In Hitchcock 1438, from Wilmington, N. C., referred here, 
the pubescence is so copious as to sug- 
gest P. leucothriz, but the nearly obso- 
lete ligule and the size of the spikelets 
place it, though somewhat doubtfully, 
in P.tenue. Hitchcock’sno. 1467 is an 
unusually robust specimen with pani- 
cles as much as 9 cm. long. 
DISTRIBUTION, 
Moist sandy woods, eastern North 
Carolina and northern Florida. 
NortH Carouina: Parmele, Ashe FG. 282.—Distribution of P. tenue, 
in 1899; Manteo, Ashe in 1898; 
Wards Mill, Chase 3170, 3172, 3183; Wilmington, Ashe in 1899, Hitchcock 332, 
1467. 
Fioripa: Lake City, Bitting 20. 
153. Panicum albomarginatum Nash. 
Panicum albomarginatum Nash, Bull. Torrey Club 24: 40. 1897. ‘Collected by 
the writer in low pine land at Eustis, Lake County, Florida, early in June, 1894, 
no. 925.”’ The type, in Nash’s herbarium, consists of two large tufts in the early 
branching state, the culms 15 to 28 cm. high, the primary panicles devoid of spikelets. 
DESCRIPTION, 
Vernal plants usually grayish green, often purplish; culms densely tufted, 15 to 
40 cm. high (rarely taller), slender but firm, ascending or spreading, glabrous includ- 
ing the nodes; leaves crowded at the base, distant above, sheaths sometimes pubescent 
on the margin and at the summit, otherwise glabrous, or the lowermost sometimes 
obscurely pubescent; ligules 0.3 mm. long, dense; blades firm, those of the midculm 
4 to6 cm. long, 4 to 6 mm, wide, rounded at the base, thick and firm, with a prominent 
white, finely serrulate, cartilaginous margin, ascending or spreading, glabrous, the 
crowded basal blades as much as IL em. long, and the uppermost blade usually much 
reduced; panicles finally long-exserted, 3 to 6 cm. long, nearly 
as wide, rather densely flowered, the flexuous branches 
ascending or spreading; spikelets 1.4 to 1.5 mm. long, 0.7 
mm. wide, obovate-elliptic, subobtuse, turgid at maturity, 
densely puberulent; first glume one-fifth to one-fourth as 
long as the spikelet, obtuse or subacute; second glume and 
FIG. 283.—P. albomargina- sterile Jemma scarcely equaling the fruit at maturity; fruit 
ium. From type speci- 1-25 mm, long, 0.65 mm. wide, elliptic, subacute. 
men. Autumnal form spreading, the primary culms branching 
from the base and lower nodes, these early branches much 
longer than the primary internodes and repeatedly branching, forming bushy tufts, the 
ultimate branchlets and reduced blades appressed; winter blades stiffly erect or spread- 
ing, very smooth and firm. 
This species is distinguished by the long crowded basal and distant upper blades, 
the uppermost usually less than half as long as those of the midculm; and by the 
autumnal form in which the primary culms branch from the basal and lower, never 
from the upper, nodes. 
The specimens collected by Hitchcock in Cuba (no. 555) are robust plants and 
differ from typical P. albomarginatum in having a ligule 1 mm. long. 
