32 LEAFLETS. 
midvein beneath and on the ocreæ: spikes very short and short- 
peduncled, ovoid, the peduncle slightly both pubescent and glan- 
dular ; bracts ovate, obtuse, glabrous. 
Tules of the Grand Rond Valley, eastern Oregon, W. C. Cu- 
sick, n. 1763 in my set and that of U. S. Herb. Quite similar, 
and perhaps specifically identical, is a plant from Lake Pend 
d’Oreille, Idaho, by A. A. Heller, 1892. 
P. stross, Aquatic, “growing in from 5 to 7 feet of water 
and floating on it,” the stout stems with short internodes which, 
as to the lower and more deeply submerged are cylindrical, but 
nearer the summit swollen and fistulous: leaves floating, not 
large, 14 to 2 inches long and from oval to elliptic-oblong, ob- 
tuse, often subcordate, the stoutish petioles about 2 inches long: 
peduncles very stout, 2 inches long, bearing the large spike an 
inch or more above the water, and this oval, 1 to 14 inches long, 
fully 3 inch in diameter, the flowers therefore very large, the 
fruiting perianth nearly 4 inch long, more than twice the length 
of the somewhat round-obvate shining achene, which neverthe- 
less is not quite smooth, rather distinctly lineolate toward the 
base and obscurely scrobiculate in the middle. 
In a lakelet at 9,550 feet on San Bernardino Mountain, south- 
ern California, W. G. Wright, no other data given on the two 
sheets in my herbarium except Mr. Wright’s herbarium number 
1809. The species is remarkable for the stoutness of its pedun- 
cles and the great size of its flowers and spikes. 
Possibly Coville & Funston’s n. 1584 may be referred here; 
but it isa smaller plant, with spikes and flowers not nearly as 
large. 
Another aquatic form of Southern California is obtained by 
Mr. Parish at Aguanga, San Diego Co., and needs further field 
study. It can hardly prove to be P. insignis, however. 
P. FISTULOSA. Riparian, evidently, though with the foliage 
and several slender spikes of the properly terrestrial species ; 
decumbent and rooting part of stem of great size, internodes 
5 or 6 inches long, } to ł inch thick, hollow, strongly and 
coarsely striate: leaves oblong-lanceolate and lanceolate, acu- 
minate, 2 to 4 inches long, the lowest nearly glabrous, the 
