. Botany for agricultural students . Botany. SEEDLINGS OF THE PEA TYPE 109 the stem. In some plants, as in Red Clover and Alfalfa, the radicle forms a prominent tap-root which enables the plant to penetrate deeply into the soil in its adult stage. In the Morning Glory, where the stem called the vine may be many feet in length, there is extreme elongation of the plumule. On the other hand, as in some Clovers and Alfalfa, the plumule and hypocotyl form a short thick stem, called the crown, which is barely. Fig. 103. — Development of a Red Clover seedling. A, cotyledons being pulled out of the gr
. Botany for agricultural students . Botany. SEEDLINGS OF THE PEA TYPE 109 the stem. In some plants, as in Red Clover and Alfalfa, the radicle forms a prominent tap-root which enables the plant to penetrate deeply into the soil in its adult stage. In the Morning Glory, where the stem called the vine may be many feet in length, there is extreme elongation of the plumule. On the other hand, as in some Clovers and Alfalfa, the plumule and hypocotyl form a short thick stem, called the crown, which is barely. Fig. 103. — Development of a Red Clover seedling. A, cotyledons being pulled out of the ground by the hypocotyl {h); r, radicle; a, root hairs; t, testa; c, cotyledons; 3, ground line. B, a more advanced stage, showing some development of the plumule (p); 6, first real leaf; d, second real leaf. C, a later stage, showing that the plumule has formed more leaves (e) but has elongated very little. above the surface of the ground, and from which the branches arise that bear the leaves, flowers, and fruit. {Fig. 103.) Seedlings of the Pea Type. — The seedlings of the Pea and Scarlet Runner Bean represent those dicotyledonous seedUngs in which the hypocotyl remains short. Thus the cotyledons remain underground and the plumule is pushed to the surface by the elongation of the stem of the epicotyl just as occurs in the Grass seedlings. But in these seedlings, in contrast to those of the. 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 Martin, John N. (John Nathan), b. 1875. New York : John Wiley & Sons, Inc.
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