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. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 322 CITKON CITRUS during the summer all cultivation is stopped, and grass, beggar-weed, or fleld-peas allowed to cover the ground, preventing sunburning and providing a source of humus so necessary in keeping up proper fertility and texture of the sandy soil of Florida. E. N. Eeasoner. CITRCLLUS (from CWnts). G
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 322 CITKON CITRUS during the summer all cultivation is stopped, and grass, beggar-weed, or fleld-peas allowed to cover the ground, preventing sunburning and providing a source of humus so necessary in keeping up proper fertility and texture of the sandy soil of Florida. E. N. Eeasoner. CITRCLLUS (from CWnts). Gaeurbitdcece. The ge- nus which includes the Watermelon. Cogniaux, the latest monographer (DC. Monogr. Phaner. 3), recog- nizes three species, all of the Old World, with the larg- est dispersion in Africa. Plant monoecious, the two kinds of fls. solitary in the axils of the Ivs.: fls. with a short, bell-like calyx tube and a deeply 5-eleft, yel- low corolla. C. vulgaris, Schrad., is the Watermelon (which see}, native to tropical and south Africa. C. Colocynthis, Schrad., is the Colocynth, extract from the fruit of which furnishes a well-known purgative drug. It is native to the Mediterranean region and tropical Africa. The fruit is small and globular, gourd-like, smooth and partly colored, the flesh very bitter : Ivs. deeply divided. L_ jj. b. ClTEXTS (ancient name for Citron). Butctcece. Orange, Lemon, Citron, etc. Aromatic, glandular shrubs or small trees, mostly thorny: Ivs. alternate, with more or less winged petioles, compound, mainly unifoliolate (appearing as a simple leaf but really compound, as shown by the joint between the petiole and lamina, Pig. 175), in one species trifoliolate: fl's. hermaphrodite; calyx eupulate, 3-5-toothed ; petals 4-8, linear-oblong, thick, glandular, imbricated in the bud ; stamens nu- merous, 20-00, occasionally only 5 ; filaments more or less united ; disk cushion-shaped ; ovary compound, composed of 5 to many united carpels, with a single
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