. Elementary botany. Botany. Fig. 94. Gennination cif castor-oil bean. middle of the seed, surrounded firmly on all sides by the endo- sperm. The stalk, or petiole, of the cotyledon, like the lower part of the petiole of the leaves, is a hollow cylinder, and contains the younger leaves, and the growing end of the stem or bud. When germination begins, the stalk, or petiole, of the cotyledon elongates. This pushes the root end of the embryo out at the small end of the seed. The free end of the embryo now enlarges somewhat, as seen in the figures, and Ijecomes the bull), or corm, of the young pla
. Elementary botany. Botany. Fig. 94. Gennination cif castor-oil bean. middle of the seed, surrounded firmly on all sides by the endo- sperm. The stalk, or petiole, of the cotyledon, like the lower part of the petiole of the leaves, is a hollow cylinder, and contains the younger leaves, and the growing end of the stem or bud. When germination begins, the stalk, or petiole, of the cotyledon elongates. This pushes the root end of the embryo out at the small end of the seed. The free end of the embryo now enlarges somewhat, as seen in the figures, and Ijecomes the bull), or corm, of the young plant. At first no roots are visible, l)ut in a short time one, two, or more roots appear on the enlarged end. 214. Section of an embryo.—If we make a longisection of the embrvo anri seed at this time we can see how the club- shaped cfitvledon is closely surrounded by the endosperm. Through the cotvledon, then, the nourishment from the endo- sperm is readilv passed over to the growing enibr\-o. In the hollow part of the petiole near the bulb can be seen the lirst 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 Atkinson, George Francis, 1854-1918. New York : H. Holt
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