Aquatic and Wetland Vascular Plants of the Northern Great Plains
7. Nymphaeaceae, the Water Lily Family
2. Nymphaea L. -- Water Lily
2. Nymphaea tuberosa Paine -- White water lily
Rhizome producing knotty, lateral tubers. Leaf blades 10-30 cm
across, green above and beneath or rarely dull purple beneath; petioles
usually striped. Flowers odorless or scarcely fragrant, 8-25 cm across;
sepals green on the back; petals oblanceolate to spatulate, obtuse
to rounded at the tip. Seeds 2.8-4.4 mm long. Jun--Sep. Same habitats
as the preceding; rare or extirpated in e SD, uncommon in the Sand Hills and
e NE; (Que. to n Ont. and MN, s to MD, IN and OK).