. Class-book of botany: being outlines of the structure, physiology and classification of plants; with a flora of the United States and Canada. Botany; Plants; Plants. 108 THK OVULES. often wido spaces covering largo portions of iho walls of the cell, as in poppy, water-lily, and in other cases, as Datura, they beconio large and fleshy, nearly fill- ing tho cell. 528. A free axile placenta, without dissepiments, occurs in some compound, onc-cellcd 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
. Class-book of botany: being outlines of the structure, physiology and classification of plants; with a flora of the United States and Canada. Botany; Plants; Plants. 108 THK OVULES. often wido spaces covering largo portions of iho walls of the cell, as in poppy, water-lily, and in other cases, as Datura, they beconio large and fleshy, nearly fill- ing tho cell. 528. A free axile placenta, without dissepiments, occurs in some compound, onc-cellcd 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 S9S 405. 39S. f amolus Valorandi, section of flower showing tho free axilo placenta. 899, Ovary of Bcrophulariace®. 41)0, Ovary of Tulip. 401, Cross-section of ovary of Flax, 5-celled, falsely 10-celled. 402, Ovary of Violet, 1-celled. 403, Ovary of Fuchsia, 4-celled. 404, Ovary of rock- ros5 Geiitianaeea^ 2-valved, 1-celled. 529. A few peculiar forms of the stjle and stigma are worthy of note in our narrow limits, as the lateral style of strawberry, tho basilar style of the Labiates and Borrageworts, the branching style of Emblica, one of the ; also, 530. The globular stigma of Aiirabilis; 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 Coniferre generally, both the style and stigma are wanting, and the ovary is represented only by a flat, open, carpellary scale bearing tho naked ovule3 at it3 base. THE OVULES. 532. Their nature. Destined to become seeds in the fruit ovules
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Keywords: ., bookcentury1800, booksubjectbotany, booksubjectplants, bookyear18
