Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . is also the/case in the Iris (Fig. 132) andmost plants of the same in the Onion the co-tyledon (which is single)lengthens, raises the seedout of the ground, and be-comes the first leaf. 127. In Indian Corn (), in Iris (Fig. 132), andalso in the germinating Cher-ry (Fig. IIP), Oak (), and Pea (Fig. 119), the leaves of the plumulesucceed one another singly, that is, there is only oneupon each joint
Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . is also the/case in the Iris (Fig. 132) andmost plants of the same in the Onion the co-tyledon (which is single)lengthens, raises the seedout of the ground, and be-comes the first leaf. 127. In Indian Corn (), in Iris (Fig. 132), andalso in the germinating Cher-ry (Fig. IIP), Oak (), and Pea (Fig. 119), the leaves of the plumulesucceed one another singly, that is, there is only oneupon each joint of stem: in other words, the leaves arealternate. Whereas in the seedling Beech and the Bean(Fig. 114, 11,7) these early leaves are in pairs, that is,are opposite. A similar difference is to be noticed in theembryo as to the 128. Number Of Cotyledons. All the earlier illustra-tions are taken from plants which have a pair of cotyle-dons, or seed-leaves, belonging to the first joint of stem,that is, to the radicle. Such embryos are accordinglysaid to be Dicotyledonous, — a name expressive of this in the Lily, Onion, Iris, Indian Corn, and the like, the embryo. FIG. 130. Indian Corn more advanced in germination, and with a cluster of 131. Section of a seed of Iris or Flower-de-Luce, magnified, showing the small embryoenclosed in the albumen, near its base. 132. Germinating plantlet of Iris. THE ROOT. 79 has only one cotyledon or true seed-leaf (Fig. 128, &c.); the otherleaves, if any are apparent, are enclosed by the cotyledon and be-long to the plumule; and the embryo with one cotyledon is ac-cordingly termed Monocotyledonous. The difference in thisrespect coincides with striking differences in thestructure of the stems, leaves, and blossoms, andlays a foundation for the division of Flowering orPhtenogamous plants (114) iuto two great Classes. 129. In a few plants, such as Pines, the embryois provided with from three to ten cotyledons,which expand into a ci
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Keywords: ., bookauthorgra, bookcentury1800, bookdecade1860, booksubjectbotany
