MILKWORT
milkwort
(noun) any of various plants of the genus Polygala
Source: WordNet® 3.1
Etymology
Noun
milkwort (countable and uncountable, plural milkworts)
Any of more than 500 species of flowering plants of the genus Polygala that are used as a food source by the larvae of some members of the Lepidoptera order.
Source: Wiktionary
Milk"wort`, n. (Bot.)
Definition: A genus of plants (Polygala) of many species. The common
European P. vulgaris was supposed to have the power of producing a
flow of milk in nurses.
Note: The species of Campanula, or bellflower, are sometimes called
milkwort, from their juice.
Source: Webster’s Unabridged Dictionary 1913 Edition