The elements of botany for The elements of botany for beginners and for schools elementsofbotany00grayuoft Year: [1887] for storage only is most completely carried out. For they are thickened to the utmost, even into hemispheres; the caulicle docs not lengthen at all; merely sends out roots from the lower end, and develops its strong plu- mule from the upper, the seed remaining unmoved underground. That is, in technical language, the germination is hypogaous. 21. There is sufScieut nourishment in the cotyledons of a pea to make a very considerable growth before any actual foliage is required.
The elements of botany for The elements of botany for beginners and for schools elementsofbotany00grayuoft Year: [1887] for storage only is most completely carried out. For they are thickened to the utmost, even into hemispheres; the caulicle docs not lengthen at all; merely sends out roots from the lower end, and develops its strong plu- mule from the upper, the seed remaining unmoved underground. That is, in technical language, the germination is hypogaous. 21. There is sufScieut nourishment in the cotyledons of a pea to make a very considerable growth before any actual foliage is required. So it is the stem-portion of the plumule which is at first conspicuous and strong- growing. Here, as seen in Fig. 35, its lower nodes bear each a useless leaf-scale instead of an efficient leaf, and only the later ones bear leaves fitted for foHage. Fig. 26. Embryo of Pumpkin-seed, partly opened. 27. Young seedliiig of same. FiQ. 28. Embryo of Common Bean (Pliaseolus vulgaris): caulicle bent down over edge of cotyledons. 29. Same germinating : caulicle well lengthened and root beginning; thick cotyledons partly .spreading; and plumule (pair of leaves) growing between them. 30. Same, older, with plumule developed into internode and pair of leaves.
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