. The elements of botany for beginners and for schools. Plants. for storage only is most completely carried out. For they are thickened to the utmost, even into hemispheres; the caulicle does 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 hypogeeous. 27' There is sufficient 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 f
. The elements of botany for beginners and for schools. Plants. for storage only is most completely carried out. For they are thickened to the utmost, even into hemispheres; the caulicle does 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 hypogeeous. 27' There is sufficient 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 foliage. Fig. 26. Embryo of Pumpkin-seed, partly opened. 27. Young seedling of same. Fig. 28. Embryo of Common Bean (Phaseolus 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 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 Gray, Asa, 1810-1888. New York : American Book Company
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectplants, bookyear1887
