HITCHCOCK AND CHASE—NORTH AMERICAN PANICUM. 27 
long-exserted, very slender, 5 to 20 cm. long, the branches scattered, short, erect, the 
Fig. 7.—P. reverchoni. From type specimen. 
branchlets bearing 1 or 2 subsessile 
spikelets, the setiform prolongation 
of the axis mostly equaling or ex- 
ceeding the spikelet; spikelets 3.5 
to 3.8 mm. long, 1.8 to 2mm. wide, 
elliptic, turgid, abruptly pointed; 
first glume about half the length 
of the spikelet, subacute, strongly 
5 to 7-nerved; second glume and 
sterile lemma _ scarcely equaling 
the fruit, strongly 5 to 7-nerved; 
fruit 3.1 to 3.3 mm. long, 1.8 to 
1.9 mm. wide, elliptic, minutely 
pointed, obscurely transversely ru- 
gose, 
This species differs from P. rami- 
setum in having longer, narrower 
blades, narrower at the base than 
the summit of the sheath, and larger spikelets, commonly but one to a branchlet, 
hence most of the spikelets subtended by a bristle, 
DISTRIBUTION. 
Rocky or sandy prairies and lime- 
stone hills, Texas. 
Texas: Dallas, Bebb 1321, Bush 
674, Reverchon 1096, in Cur- 
tiss N. Amer. Pl. 3618*, L; 
Abilene, Tracy 7940; Colo- 
rado, Tracy 7939; Weather- 
ford, Tracy 7948; Kerrville, 
Heller 1603; Gillespie County, 
Jermy 39; Bexar County, 
Jermy 233, 234; San Antonio, 
Fig. §.—Distribution of 2. reverchoni. 
Jermy; southwest Texas, Nealley in 1890; without locality, Wright 792. 
6. Panicum firmulum sp. nov. 
DESCRIPTION. 
Plants light olive green, rather loosely tufted, ascending or decumbent at base, 
Fia. 9.—P. firmulum. From type specimen. 
from creeping knotted rootstocks as 
much as 5 cm. long; culms 30 to 
40 cm. high, simple or with a few 
appressed branches, glabrous, the 
nodes glabrous or strigose; sheaths 
overlapping, striate, papillose-pubes- 
cent, papillose only, or nearly gla- 
brous, a tuft of stiff hairs 3 mm. long 
on the sides at the summit; ligule 
dense, about 1.5 mm. long; blades 
ascending or spreading, firm, 4 to 10 
cm. long, the lower shorter and more 
spreading, 4 to 7 mm. wide, ab- 
ruptly acuminate, rounded at the base 
and wider than the sheath, sparsely 
papillose-ciliate, at least toward the 
base, scabrous on the upper surface; panicles slender, interrupted, their brancheserect, 
