. The families of flowering plants. Plants; Phanerogams. 146 FAMILIES OF FLOWEEING PLANTS berries are pungent and aromatic, and are sometimes chewed as a rem- edy for toothache. The trees of the Brazilian genus Esenbeckia have bark possessing bitter and tonic properties. The orange and orange-like plants have frequently been classed as a distinct family, but are now usually included in the Kutaceae. There are numerous genera in this tribe, almost exclusively East Indian in origin, but frequently cultivated. All are distinguished by the familiar pulpy fruit. The orange, lemon, lime and shaddock
. The families of flowering plants. Plants; Phanerogams. 146 FAMILIES OF FLOWEEING PLANTS berries are pungent and aromatic, and are sometimes chewed as a rem- edy for toothache. The trees of the Brazilian genus Esenbeckia have bark possessing bitter and tonic properties. The orange and orange-like plants have frequently been classed as a distinct family, but are now usually included in the Kutaceae. There are numerous genera in this tribe, almost exclusively East Indian in origin, but frequently cultivated. All are distinguished by the familiar pulpy fruit. The orange, lemon, lime and shaddock all belong to the genus Citrus. Mention should be made of one other American ruta^ ceous tree, the hop trefoil (Ptelea), distinguished by its trifoliate leaves and dry, winged fruit. Family Simarubaceae. Ailanthus Family. Contains about 27 genera and 150 species, natives of tropical regions. They are trees or shrubs with bitter bark, distinguished from the preceding family mainly by the absence of dots on the foliage. The flowers are regular, either perfect or dioecious, 3-5-parted, the petals borne on a disk. The fruit is various. Our only North American representa- tives of this family are the ailanthus or "tree- of-heaven," a well-known shade tree exten- sively naturalized from Asia, and an indig- enous species of Simarouba, on the Keys of south Florida. Various South American species of the genus yield valuable medi- cines. Quassia is the product of several trees belonging to this family, but is princi- pally derived from Simarouba amara (Fig. 128, no. 1). Family Burseraceae. Terebinth Fam- ily. Contains 16 genera and about 300 species, natives exclusively of tropical Asia, Africa and America. They are forest trees of high value as resin and balsam bearing plants. Thus myrrh is the product of Gommiphora Abyssinica, and bdeUium is derived from' G. Africana. The resin known as olibanum, which is supposed to have been the frankincense of the ancients, comes from the
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