AMARYLLIS, in botany, a genus of the hexandria monogynia class. The spathe of the amaryllis consists of one leaf, the flower, like other liliaceous plants, has six petals, and the stigma is trifid. There are 12 species of the amaryllis, all of them natives of the warm climates. Fig. 1. of plate XII. represents the orientalis, a native of the E. Indies.