buddleia(n = noun.plant) butterfly bush - tropical shrub having clusters of white or violet or yellow flowers;
is a kind of bush, shrub
is a member of genus buddleia
buddleia, n. any shrub of the genus Buddleia, with fragrant lilac, yellow, or white flowers attractive to butterflies.
Etymology:
A. Buddle, Engl. botanist d. 1715