. The botany of crop plants : a text and reference book. Botany, Economic. RUTACE^- 477 Key to Important Genera of RutacejE' Leaves trifoliate, Poncirus (trifoliate orange). Leaves unifoliate. Ovary three- to seven-celled; ovules two in each cell; stigma cavernous, Fortunella (kumquat). Ovary eight- to fifteen-celled; usually more than two ovules in each cell; stigma solid. Citrus (orange, lemon, grapefruit, lime, etc.).. r'p i^C Q ' 'jacks kl B Fig. 201.—Sour orange (Citrus aurantium). A, flowering branch; B, lengthwise section of flower; C, lengthwise section of fruit; D, seed. (After Wossid
. The botany of crop plants : a text and reference book. Botany, Economic. RUTACE^- 477 Key to Important Genera of RutacejE' Leaves trifoliate, Poncirus (trifoliate orange). Leaves unifoliate. Ovary three- to seven-celled; ovules two in each cell; stigma cavernous, Fortunella (kumquat). Ovary eight- to fifteen-celled; usually more than two ovules in each cell; stigma solid. Citrus (orange, lemon, grapefruit, lime, etc.).. r'p i^C Q ' 'jacks kl B Fig. 201.—Sour orange (Citrus aurantium). A, flowering branch; B, lengthwise section of flower; C, lengthwise section of fruit; D, seed. (After Wossidlo.) CITRUS (Citron, Lemon, Orange, etc.) Habit, Roots.—Citrus species are aromatic, mostly thorny- shrubs or small trees with the spines disposed singly in the leaf axils. The sweet orange tree is a surface feeder; almost its entire root system is in the first i8 inches of soil. The sour orange root system penetrates to a much greater depth. The citrus plant is different from most plants in the total absence of root hairs. Absorption is carried on by the fibrous roots which are abundant and capable of rapid growth. Leaves.—The leaves are glandular-dotted, winged-petio- • Hume has been followed largely in the discussion of this Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Robbins, Wilfred William, 1884-1952. Philadelphia : P. Blakiston's Son
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectbotanyeconomic
