The American botanist and florist; including lessons in the structure, life, and growth of plants; together with a simple analytical flora, descriptive of the native and cultivated plants growing in the Atlantic division of the American union . ust be ^ false one; as occurs in Flax (136). 4th. The , as well as the ventral suture, Avill be axial. 133. Again: the carpels may each be open and conjoined bytheir edges, as are the petals of a gamopetalous corolla. So itis in the ovary of Violet (137) and Rock-rose (139). In thiscase, 1st. There will be no partition (unless a false one, as
The American botanist and florist; including lessons in the structure, life, and growth of plants; together with a simple analytical flora, descriptive of the native and cultivated plants growing in the Atlantic division of the American union . ust be ^ false one; as occurs in Flax (136). 4th. The , as well as the ventral suture, Avill be axial. 133. Again: the carpels may each be open and conjoined bytheir edges, as are the petals of a gamopetalous corolla. So itis in the ovary of Violet (137) and Rock-rose (139). In thiscase, 1st. There will be no partition (unless a false one, as in theCrucifers), and but one cell; 2d. The Placentae will be parietal^i. 6., on the wall of the cell {^paries., a wall). 134. Between the two conditions of axial (or central) and parietal placentae.^ we find alldegrees of transition, as illustrated in the different species of St. Johnswort and inPoppy, where the inflected margins of the carpels carry the placeutte inward, well-nighto the axis. Moreover, the placentJB arc not always mere marginal lines, but often widespaces covering large portions of the walls of the cell, as in Poppy and Water-lily: inother cases, as Datura (168), they become large and ilcshy, nearly filling the 133, Satnolus Yalerandi. section of flower showiiiK the free axial placenta. , Ovary of Scrophula-riaceae. 135, Ovary of Tulip. 136, Cross-section of ovary of Flax, S-celled, falsely 10-celled. 137, Ovaryof Violet, 1-celled. 138, Ovary of Fuchsia, 4-celled. 139, Ovary of Rock-rose, 1-celled, , Gentianacese, 2-valved, 1-celled. 135. A free axial placenta.^ without partitions, occurs in somecompound one-celled ovaries, as in the Pink and Primrose orders(133). This anomaly is explained in two ways—first, by theobliteration of the early formed partitions, as is actually seen tooccur 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 po
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1870
