Ranunculus n. : A genus of herbs, mostly with yellow flowers, including crowfoot, buttercups, and the cultivated ranunculi (R. Asiaticus, R. aconitifolius, etc.) in which the flowers are double and of various colors.

Example:
How do mix Ranunculus bulbs or Tulips bulbs look like?

Taxonomy
buttercup, Ranunculus, species, plants, free encyclopedia, water crowfoot, genus, flowers, Ranunculus repens, leaves, frog, Coyote, Sardinian, Creeping buttercup, family Papaveraceae, white flowers, made eyes, Ranunculus sardous.

Defination from the web:
Ranunculus species are used as food plants by the larvae of some Lepidoptera species including Hebrew Character and Small Angle Shades. ... When Ranunculus plants are handled, naturally occurring ranunculin is broken down to form protoanemonin, which is known to cause contact ...