42 LEAFLETS. 
lanceolate, acuminate, 5 to 8 inches long, 14 to 2 inches broad, 
spreading, sparsely scaberulous above, the lower face, and espe- 
cially the midvein, rough with short rigid acute closely appressed 
hairs; petioles an inch long or more; sheaths clothed with long 
closely appressed bristly hairs, the summit somewhat lacerate 
and bristly-ciliate: spikes several, long, linear, somewhat droop- 
ing: achenes thick-lenticular, not highly polished but rather 
dull blackish. 
Swamps along the Mississippi near its mouth in extreme 
southern Louisiana, 18 July, 1885, Rev. A. B. Langlois. A tall 
and rank member of this group, with long, half-drooping spikes. 
Aquatic and floating form to be sought. 
P. Cusicku. Rather slender upright amply leafy stems two 
feet high or more from a prostrate and submersed rooting por- 
tion quite as slender, both the submersed and aerial internodes 
about 3 inches long, the aerial nodes abruptly swollen and the 
whole stem strongly striate, glabrous: blades of the short- 
petioled and spreading leaves 5 to 8 inches long, oblong-lanceo- 
late, acuminate, thin, slightly undulate, inconspicuously and 
finely appressed-pubescent on both faces, only the stout closely 
appressed hairs of the midvein beneath with a thick base: ocreæ 
hyaline, clothed with long soft appressed hairs; peduncles 
glandular-hispid, 24 inches long, the cylindric spikes narrow 
and about as long, the whole not equalling the upper leaves; 
bracts with long appressed dorsal and margined hairs, and 
some shorter gland-tipped ones at base. 
Tules of the Grand Rond Valley, eastern Oregon, Aug., 1897, 
W. C. Cusick; the type in my herbarium under the collector’s 
n. 1764. Evidently here, as in the case of P. rigidula of the 
upper Missouri region, we have a species truly aquatic, as to 
the basal parts and the roots, but with still the habit, foliage, 
and inflorescence of the strictly terrestrial species. 
I refer to P. Custckit various sheets collected in eastern Ore- 
gon, Washington, and Idaho, by Suksdorf, Leiberg, Sandberg, 
Elmer and others. 
P. FRANCISCANA. Terrestrial state erect, densely leafy, 2 
feet high, the nodes not swollen, internodes about 2 inches long, 
