. North American trees : being descriptions and illustrations of the trees growing independently of cultivation in North America, north of Mexico and the West Indies . Trees. Citrus Fruits sn gin, each on a short stalk, thick and leathery, bright green, smooth and shining above, dull green and con- spicuously veined and black glan- dular dotted beneath. The flowers appear throughout the year in pani- cles 3 to 8 cm. long, on short slightly hairy pedicels; the obovate or oval petals are 3 to mm. long; the ovoid or ellipsoid ovary is hairy. The fruit is obovoid to elliptic-oval, 6 to 13 mm.
. North American trees : being descriptions and illustrations of the trees growing independently of cultivation in North America, north of Mexico and the West Indies . Trees. Citrus Fruits sn gin, each on a short stalk, thick and leathery, bright green, smooth and shining above, dull green and con- spicuously veined and black glan- dular dotted beneath. The flowers appear throughout the year in pani- cles 3 to 8 cm. long, on short slightly hairy pedicels; the obovate or oval petals are 3 to mm. long; the ovoid or ellipsoid ovary is hairy. The fruit is obovoid to elliptic-oval, 6 to 13 mm. long, tapering below into a short neck, black with a bluish bloom when fully ripe, and aromatic. The wood is similar to that of the preceding species, and its branches are also used for Fig. 532. — Balsam Torchwood. V. CITRUS FRUITS GENUS CrrRUS LINN^US ITRUS consists of about 30 species of usually thorny evergreen trees or shrubs of Asiatic origin, many of which are cultivated throughout the tropics for their delicious acidulous fruits and have become abundantly naturalized in many warm countries. Their economic im- portance lies in their valuable fruits. The volatile oil contained in the abundant small oil-glands, especially in the rind of the fruit, is largely used for flavoring, and the more acid fruits are a source of that most important of vegetable acids, citric The wood of the orange tree is used to some extent in fancy cabinet work and for canes. Several of the lesser known fruits of this genus have become popular with us. Foremost among these is the Grape fruit, a form of Citrus decumana Linnaeus, also commonly known as Pomelo; this species is a native of the Malay region and is a large tree noteworthy for its immense grape-like clusters of large, nearly globular, hght yellow fruits often i dm. or more in diameter, the flesh of which has a pe- culiarly blended taste of bitter, sweet and acid, making it a most healthful break- fast food. The Mandarin
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