* There are numerous varieties of oranges; as, the bitter orange, which is supposed to be the original stock; the navel orange, which has the rudiment of a second orange imbedded in the top of the fruit; the blood orange, with a reddish juice; and the horned orange, in which the carpels are partly separated.

Mandarin orange. See Mandarin. - - Mock orange (Bot.), any species of shrubs of the genus Philadelphus, which have whitish and often fragrant blossoms. -- Native orange, or Orange thorn (Bot.), an Australian shrub (Citriobatus parviflorus); also, its edible yellow berries. -- Orange bird (Zoöl.), a tanager of Jamaica (Tanagra zena); -- so called from its bright orange breast. -- Orange cowry (Zoöl.), a large, handsome cowry (Cypræa aurantia), highly valued by collectors of shells on account of its rarity. -- Orange grass (Bot.), an inconspicuous annual American plant (Hypericum Sarothra), having minute, deep yellow flowers. -- Orange oil (Chem.), an oily, terpenelike substance obtained from orange rind, and distinct from neroli oil, which is obtained from the flowers. -- Orange pekoe, a kind of black tea. -- Orange pippin, an orange-colored apple with acid flavor. -- Quito orange, the orangelike fruit of a shrubby species of nightshade (Solanum Quitoense), native in Quito. -- Orange scale (Zoöl.) any species of scale insects which infests orange trees; especially, the purple scale (Mytilaspis citricola), the long scale (M. Gloveri), and the red scale (Aspidiotus Aurantii).