Guaiacum (lignum-vitæ): Tree. Tropical and sub-tropical. Exclusively American; native to West Indies.
Order XIV.—Rutaceæ: Small trees and shrubs; eighty-three genera.
Citrus (orange, lemon, shaddock): In all regions of no frost. India. Cultivated in Persia, Syria, southern Europe, northern Africa, Spain, China, Japan, Sicily, Australia, Brazil, West Indies, Florida, southern California, Azores.
Order XV.—Meliaceæ: Trees; thirty-seven genera.
Swietenia (mahogany): Large tree. Tropical and sub-tropical. West Indies, Bahamas, Central America, southern Florida. Cultivated in southern British India.
Order XVI.—Iliciniæ: Trees and shrubs; three genera.
Ilex (Paraguay tea): Small tree. Paraguay. In Parana, ten million pounds produced annually.
Order XVII.—Rhamnaceæ: Trees and shrubs; thirty-seven genera.
Ceanothus (New Jersey tea): Shrub. Eastern North America.
Rhamnus (buckthorn): Shrubs, small trees. Southern Persia and southern Levant countries. Grows as far north as England.