. Plant studies; an elementary botany. Botany. 370 PLANT STl'DIKS from the seed. Formerly it was culled either cuullrJe or radicle. In Dicotj'ledons the stem-tip between the coty- ledons often organizes the rudiments of subsequent leaves, forming a little bud which is called the plumule. Embryos differ much as to completeness of their devel- opment within the seed. In some plants, especially those which are jiarasitic or saprophytic, tlie embryo is merely a small mass of cells, without any organization of root, stem, or leaf. In many cases the embryo becomes highly devel- ojicd, the endosperm
. Plant studies; an elementary botany. Botany. 370 PLANT STl'DIKS from the seed. Formerly it was culled either cuullrJe or radicle. In Dicotj'ledons the stem-tip between the coty- ledons often organizes the rudiments of subsequent leaves, forming a little bud which is called the plumule. Embryos differ much as to completeness of their devel- opment within the seed. In some plants, especially those which are jiarasitic or saprophytic, tlie embryo is merely a small mass of cells, without any organization of root, stem, or leaf. In many cases the embryo becomes highly devel- ojicd, the endosperm being used up and the cotyledons stutled with food material, the plumule containing several well-organized young leaves, and the embi'yo completely filling the seed cavity. The common bean is a good illus- tration of this last case, the whole seed within the integu- ment consisting of the two large, fleshy cotyledons, between which lie the hypocotyl and a plumule of several leaves. 245. The seed.—As in Gymnosperms, while the processes above described are taking place within the ovule, the in- tegument or integuments are becoming transformed into the testa (Fig. 330). When this hard coat is fully devel-. .330. Tlii' two IIl'imts to tlio left are seeds (if viij|,-t, one showinf; tlie lila.'k, lianl te-sta, tlie other lieiiiL' sectioned and phowitiLf testa, endosperm, and iniliedded emtjryo : tin- Il^no'e to the right is a se), endosperm (-//I, and embryo d-///).—A fter Atkinson. oped, the activities within cease, and the whole structure passes into that coTidition of suspended animation which is so little understood, tind which iiuiy continue for a long 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 Coulter, John Merle, 1851-1928. New York, D. Appleton and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1900
