. The botany of crop plants; a text and reference book. Botany, Economic. 154 BOTANY OF CROP PLANTS small, membranous, and ciliate on the upper margins. There are three stamens, and a single pistil with two feathery stigmas. Opening of the Flower, Pollination and Fertilization.— Rye is the only common cereal, besides corn, that is regularly cross-fertilized. These two cereals cannot be self-fertiUzed without a reduction in vigor and productivity. Apparently,. Pjq 25—Rye (Secale cereale). A, a single spikelet at a joint on the rachis; B, grain, external view; C, grain in cross-section. A, X 2j4
. The botany of crop plants; a text and reference book. Botany, Economic. 154 BOTANY OF CROP PLANTS small, membranous, and ciliate on the upper margins. There are three stamens, and a single pistil with two feathery stigmas. Opening of the Flower, Pollination and Fertilization.— Rye is the only common cereal, besides corn, that is regularly cross-fertilized. These two cereals cannot be self-fertiUzed without a reduction in vigor and productivity. Apparently,. Pjq 25—Rye (Secale cereale). A, a single spikelet at a joint on the rachis; B, grain, external view; C, grain in cross-section. A, X 2j4; B and C, xs- no ill effects result from self-fertilization of barley, wheat and oats. According to some observers, the pollen of rye is im- potent on the stigma of the same flower. Fruwirth notes that the flower is completely closed within twenty-five to thirty minutes after it begins to open, providing the stigmas re- ceive pollen. In case the stigmas are not dusted, the flowers remain open much longer. Blooming begins between 5:00 and 6: 00 and continues until 9: 00 or 11: 00 Then blooming decreases throughout the afternoon, becoming. 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
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectbotanyeconomic
