This section is from the book "Handbook Of Hardy Trees, Shrubs, And Herbaceous Plants", by W. Botting Hemsley. Also available from Amazon: Handbook of hardy trees, shrubs, and herbaceous plants.
The Oranges are shrubs or trees having alternate dotted leaves with a winged petiole jointed with the lamina. Flowers hermaphrodite, very fragrant. The fleshy fruit is too well known to need description. There are only about five species, from tropical Asia, but the varieties are almost interminable.
Fig. 63. Citrus Aurantium. (1/3 nat. size.) H
1. C. Aurantium (fig. 63). Common Orange.- Neither this nor any species or variety of the genus is quite hardy in this country, though in some parts of Devonshire they succeed with slight protection. Formerly, when there was less variety in ornamental shrubs, they were more frequently grown in tubs or large pots in the conservatory, and removed into the open air during the Summer months.