. The botany of crop plants; a text and reference book. Botany, Economic. POMACES 371 are seen to arise from the concave sides of the torus. Follow- ing the appearance of sepal primordia, appear petal primor- dia, then those of stamens, and lastly those of the carpels. The succession of floral cycles is acropetal, , in order from without to the Fig. 155.—Diagram showing the development of apple. Dotted area repre- sents pith. Not drawn to scale. {After Kraus, Oregon Agr. Exp. Sta.) The primordia of stamens appear in three cycles, those of the outer usually being laid down first (F
. The botany of crop plants; a text and reference book. Botany, Economic. POMACES 371 are seen to arise from the concave sides of the torus. Follow- ing the appearance of sepal primordia, appear petal primor- dia, then those of stamens, and lastly those of the carpels. The succession of floral cycles is acropetal, , in order from without to the Fig. 155.—Diagram showing the development of apple. Dotted area repre- sents pith. Not drawn to scale. {After Kraus, Oregon Agr. Exp. Sta.) The primordia of stamens appear in three cycles, those of the outer usually being laid down first (Fig. 156). The carpel primordia appear within the central portion of the cup-shaped torus. There are five of these surrounding a small central cavity, which is formed by a lack of growth at the center of the torus. Hence there is no common placenta, but each carpel has its two separate placentas, which in "open-cored" pomes may become closely connected. These facts will be considered again in the account of fruit development. It is thus shown by the studies of Kraus that calyx lobes, petals, stamens, and carpels are all outgrowths of the urn- shaped 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 & Co
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectbotanyeconomic
