With distinguishing word: any of various plants having heart-shaped parts or parts with heart-shaped markings.

A plant having holes or transparent patches in its leaves; spec. any of various succulent plants having transparent or translucent areas at the ends…

(see quot. 1960).

More generally: a plant or part of a plant (as a leaf, flower, etc.) resembling a parasol.

Botany. A petaloid flower part; spec. a flower part exhibiting petalody.

A bulbous plant bearing several flowers on one stem, or producing several flowering stems from one bulb. Usually attributive.