. Elementary botany. Botany. HOW PLANTS OBTAIN THEIR FOOD. 103 also hard and shining black, splits open at the opposite end, that is at the stem end. It usually splits open in the form of three ribs. Next within the inner coat is a very thin, whitish film (the remains of the nucellus, and corresponding to the perisperm) which shrivels up and loosens from the white mass, the endosperm, within. In the castor-oil bean, then, the endosperm is not all absorbed by the embryo during the formation of the seed. As the plant becomes older we should note that the fleshy endosperm be- comes thinner and th
. Elementary botany. Botany. HOW PLANTS OBTAIN THEIR FOOD. 103 also hard and shining black, splits open at the opposite end, that is at the stem end. It usually splits open in the form of three ribs. Next within the inner coat is a very thin, whitish film (the remains of the nucellus, and corresponding to the perisperm) which shrivels up and loosens from the white mass, the endosperm, within. In the castor-oil bean, then, the endosperm is not all absorbed by the embryo during the formation of the seed. As the plant becomes older we should note that the fleshy endosperm be- comes thinner and thin- ner, and at last there is nothing but Fig. 93. How the garden bean conies out r,f the ground. First the looped hypocotyl, then the cotyledons pulled out, next casting off the seed coat, last the plant erect, bearing thici: cotyledons, the expanding leaves, and the plumule between them. a thin, whitish film covering the green faces of the cotyledons. The endosperm has been gradually absorbed by the germinat- ing plant through its cotvledons and used for food. Arisaema triphyllum.* 212. Germination of seeds of jack-in-the-pulpit.—The ovaries of jack-in-the-pulpit form large, bright red berries with a soft pulp enclosing one to several large seeds. The seeds are oval in form. Their germination is interesting, and illustrates one type. * In lieu of ArisEema make a practical slud\' uf the pea. See paragraph 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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