1) Herb 2) Herbaceous plant 1) Hydrophyllum 2) Shawny 
In botany, waterleaf can mean: In architecture, waterleaf means: ...[architecture] In architecture, a waterleaf is a distinctive sculptural motif used on the capitals of columns and pillars in European buildings during the late twelfth century. It is characteristic of the `late Norman` style of Romanesque architecture. A waterleaf capital is formed of broad, smooth leaf-shapes (typically four in number), un...
• (n.) Any plant of the American genus Hydrophyllum, herbs having white or pale blue bell-shaped flowers.
any of about eight species of herbaceous plants constituting a genus (Hydrophyllum) in the borage family (Boraginaceae) and native to damp woodlands ... [1 related articles]
a flowing, gently curving leaf-form characteristic of C12 capitals
Wa'ter·leaf` noun (Botany) Any plant of the American genus Hydrophyllum , herbs having white or pale blue bell-shaped flowers. Gray. 
[n] - any of several plants of the genus Hydrophyllum
noun any of several plants of the genus Hydrophyllum