MILLER AND STANDLEY—NORTH AMERICAN NYMPHAEA. 108 
green or lighter, the disk yellowish. (PLatres 42, F, facing p. 96; 45, B, facing p. 101. 
Fiaures 7, ¢, 36, 37.) 
Additional specimens examined: 
Dry— 
Grorata: Ii shallow water (30 to 60 cm. deep) of Ocean Pond, Lowndes County, 
September 4, 1902, R. M. Harper 1610. 
With Nymphaea orbiculata, the only closely related species, this forms a group 
sharply differentiated from all 
other North American Nym- 
phaeas. The plants are marked 
by their large, almost orbicular, 
silky-pubescent, thick and 
almost leathery leaves, and large 
flowers and fruit. This species 
may be separated from its near 
relative by the open sinus of the 
leaves, larger flowers and fruit, 
and larger seeds. In addition 
the stamens are in decidedly 
fewer rows. 
17. Nymphaea polysepala 
(Engelm.) Greene. 
Nuphar polysepalum Engel. 
Trans. Acad. St. Louis. 2: 
283. 1865. 
Nuphar polysepalum pictum 
Engelm. loc. cit. 285. 1865. 
Nymphaea polysepala Greene, 
Bull. Torrey Club 15: 84, 
1888. 
Type Locauity: “In Osborn’s 
Lake, in the same region, at an 
sine terion”? de" Gia ‘s Lake Fig, 38.—Leaf outline of ane polysepala, typical form. 
near Long’s Peak,’’ Colorado. 
The type was collected by Dr. C. C. Parry. 
DistripuTion: Alaska south through northern California and in western Nevada, 
and southeastward through northern Idaho and western 
Montana to western South Dakota and Colorado. 
DESCRIPTION. 
Leaves usually floating, rarely held above the water, 
the lobes, however, often elevated, oblong or ovate, 
rather thick, dull green, glabrous, 21 to 40 cm. long and 
16 to 26 cm. wide, sometimes slightly narrowed at the 
apex but usually rather broadly rounded, widest just 
above the base; sinus usually open and broadly V-shaped, 
sometimes closed, 7 to 10 cm. deep, the lobes rounded or 
acutish; petiolesand pedunclesglabrous, terete, 8to16mm. 
in diameter; submersed leaves lacking; flowers 55 to 70 
mm. in diameter and 40 mm. high, depressed-globose, the perianth when spread 
measuring 110 to 140 mm.; sepals usually 9, sometimes 7 to 12, the outer ones small, 
rounded-oblong, 30 to 50 mm. long, the inner orbicular, 40 to 55 mm. long and 35 to 
22075°—12——4 
Fic. 39.—Stigmatic pattern of 
Nymphaea polysepala. Nat- 
ural size. 
