gardenia(n = noun.plant) - any of various shrubs and small trees of the genus Gardenia having large fragrant white or yellow flowers;
is a kind of bush, shrub
is a member of genus gardenia
has particulars: cape jasmine, cape jessamine, gardenia augusta, gardenia jasminoides

   A genus of plants, some species of which produce beautiful and fragrant flowers; Cape jasmine; -- so called in honor of Dr. Alexander Garden. [1913 Webster]

gardenia, n. any tree or shrub of the genus Gardenia, with large white or yellow flowers and usu. a fragrant scent.

Etymology:
mod.L f. Dr A. Garden, Sc. naturalist d. 1791

crepe gardenia, gardenia augusta, gardenia jasminoides, genus gardenia