OLEACEOUS a.
Of, pertaining to, or resembling, a natural order of plants (Oleaceæ), mostly trees and shrubs, of which the olive is the type. It includes also the ash, the lilac, the true jasmine, and fringe tree.
ONAGRACEOUS; ONAGRARIEOUS a.
Pertaining to, or resembling, a natural order of plants (Onagraceæ or Onagrarieæ), which includes the fuchsia, the willow- herb (Epilobium), and the evening primrose ().
ORCHIDACEOUS a.
Pertaining to, or resembling, a natural order (Orchidaceæ) of endogenous plants of which the genus Orchis is the type. They are mostly perennial herbs having the stamens and pistils united in a single column, and normally three petals and three sepals, all adherent to the ovary. The flowers are curiously shaped, often…