. Class-book of botany : being outlines of the structure, physiology and classification of plants : with a flora of the United States and Canada. Botany; Botany; Botany. 108 THE OVULES. often wide spaces covering large portions of the walls of the cell, as in poppy, water-lily, and in other cases, as Datura, they become large and fleshy, nsarly till- ing the cell. 528. A free axile placenta, without dissepiments, occurs in some compound, one-celled ovaries, as in the pink and primrose orders. This anomaly is explained in two ways : first, by the obliteration of the early formed dissepiments, a
. Class-book of botany : being outlines of the structure, physiology and classification of plants : with a flora of the United States and Canada. Botany; Botany; Botany. 108 THE OVULES. often wide spaces covering large portions of the walls of the cell, as in poppy, water-lily, and in other cases, as Datura, they become large and fleshy, nsarly till- ing the cell. 528. A free axile placenta, without dissepiments, occurs in some compound, one-celled ovaries, as in the pink and primrose orders. This anomaly is explained in two ways : first, by the obliteration of the early formed dissepiments, as is actually seen to occur in the pinks ; secondly, by supposing the placenta to be, at least in some cases, an axial rather than a marginal growth; that is, to grow from the point of the axis rather than from the margin of the carpellary leaf, for in primrose no dissepiments ever appear. 404 89S 405. MS. Samolus Valorandi, section of flower showing tho free axilo placenta. 399, Ovary of Scrophulariacese. 400, Ovary of Tulip. 401, Cross-section of ovary of Flax. 5-celled, falsely ID-celled. 402, Ovary of Violet, 1-celled. 403, Ovary of Fuchsia, 4-celled. 404, Ovary of rock- rose, 1-celled, 5-carpelled. 405 Gentianaceai, 2-valved, 1-celled. 529. A few peculiar forms of the style and stigma are worthy of note in our narrow limits, as the lateral style of strawberry, tho basilar style of the Labiate and Borrageworts, the branching stylo of Emblica, one of the Euphorbiacere; also, 530. The globular stigma of Mirabilis; the linear stigma of Gyromia; the feathery stigma of grasses ; the filiform stigma of Indian corn ; the lateral stigma of Aster; the petaloid stigmas of Iris ; the hooded stigma of violet (371—379). 531. Stigma wanting. In the pine, cedar, and the Coniferse generally, both the stylo and stigma are wanting, and the ovary is represented only by a flat, open, carpellary scale bearing the naked ovules at its base. THE OVULES. 532. Their nature. Destined to become seed
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectbotany, bookyear1861
