(436) 
one-half to two-thirds as wide as the spikelets; spikelets 
singly disposed, broadly oval, about 2.75 mm. long and 2.2 
. wide, the outer 2 scales 5-nerved, the lateral nerves ap- 
proximate at the fold, the third scale yellowish white, papil- 
lose-roughened in longitudinal lines 
In sandy soil, peninsular Florida. Type collected by the 
writer at Eustis, Lake Co., June 16-30, 1894, no. 1027; nos. 
507 and 1340 of the same collection, and no. 2080 of the 
collection of 1895, all secured at the same place, are also 
referred here. Related to P. /aeve Michx., but the densely 
hirsute sheaths and upper surface of the leaf-blades at once 
distinguish it. 
ArisTipA Mouru. 
A glabrous perennial. Culms very slender, leafy only 
toward the base, 5-7 dm. tall, erect; leaves 4; lowermost 
sheath distant from the others which are crowded and over- 
lapping; ligule a scarious truncate ring about r mm. long; 
blades flat, erect, acuminate, usually 6-10 cm. long, and 1-2 
mm. wide at the base, those on the innovations much smaller: 
raceme slender, long-exserted, 2-3 dm. long; spikelets scat- 
tered, shorter than the internodes, usually about one-half as 
long, appressed, the lower ones sometimes very distant ; empty 
scales glabrous, equal in length, yellowish brown, acute, 
t-nerved, 10-12 mm. long, the flowering scale shorter than 
the empty ones, 8-9 mm. ‘long , its awns hispidulous, of equal 
thickness, widely spreading, flat and loosely spiral at the 
base, the spreading portion of the central one about 1.5 cm. 
long, that of the lateral ones a little shorter. 
On sandy ridges, Alabama. Collected by Dr. Charles 
Mohr, in whose honor I take pleasure in naming it, at Spring 
Hill, Mobile Co., Oct. 4, 1886, and distributed as A. sémplic- 
flora; also secured at the same place by B. F. Bush, Aug. 
26, 1897, no. 5, and distributed as A. stricta. Related to A. 
sunplicifiiora, but abundantly distinct. In that species the 
spikelets are quite numerous and crowded with their empty 
scales smaller, the first scale strongly hispidulous, and the 
lateral awns of the flowering scale markedly more slender 
than the central awn. 
