MILLER AND STANDLEY—-NORTH AMERICAN NYMPHAEA. 71 
Fruit not tinged with red 
when mature. 
Leaves 15 to 35 cm. 
long; rounded 
at the apex.... 5. N. advena. 
Leaves 25 to 50 cm. 
long,acutish... 5a. NW. advena macrophylla. 
Fruit conspicuously tinged 
with red at matu- 
rity. 
Leaves large, 25 to 40 
cm. long, acut- 
ish; seeds very 
numerous...... 5b. NW. advena erythraea. 
Leaves smaller, 12 to 
20 cm. long, 
broadly round- 
ed at the apex; 
seeds few (15 to 
30).....------- 6. N. ozarkana. 
Lower surface of the leaves more or less 
pubescent. 
Leaf blades of an oval type; pubes- 
cence dense.................-6- 12. N. ovata. 
Leaf blades orbicular in outline, or 
nearly so. 
Lower surface of leaves with little 
pubescence; petioles nearly 
glabrous; leaves 16 to 21 
cm. wide........-.......-.- 13. N. puberula. 
Lower surface of leaves and peti- 
oles covered with a dense, 
silvery, silky pubescence. 
Fruit small, 18 to 24 mm. in 
diameter; stigma rays 
about 12 (9 to 14); leaves 
16 to 24 cm. wide...... 14. N. microcarpa. 
Fruit larger, 45 to 50 mm. in 
diameter; stigma rays 
much more numerous; 
leaves 30 to 50 cm. wide. 
Sinus closed; stamens in 
9 or 10 rows; diam- 
eter of flowers about 
50 mm.; seeds about 
4 mm. long and 3 
mm. thick........ 15. N. orbiculata. 
Sinus open; stamens in 
6 or 7 rows; diame- 
ter of flowers about 
70 mm.; seeds about 
6 mm. long and 4.6 
mm. thick........ 16. N. bombycina. 
22075°—12——-2 
