. The elements of structural botany [microform] : with special reference to the study of Canadian plants, to which is added a selection of examination papers. Plant anatomy; Botany; Plantes; Botanique. rig. ated from each otlier by a donhh' naif, and that the seeds would bo found arranged about the centre or axis of tho pistil; ni;d this is the actual state of things in the Tulip, whose pistil is formed by tho union of three carpels. When the pisoil ripens, tho double walls sepa- rating the cells split asunder. To these separating walls the name imnif or purtitimi is given. 140. But it of
. The elements of structural botany [microform] : with special reference to the study of Canadian plants, to which is added a selection of examination papers. Plant anatomy; Botany; Plantes; Botanique. rig. ated from each otlier by a donhh' naif, and that the seeds would bo found arranged about the centre or axis of tho pistil; ni;d this is the actual state of things in the Tulip, whose pistil is formed by tho union of three carpels. When the pisoil ripens, tho double walls sepa- rating the cells split asunder. To these separating walls the name imnif or purtitimi is given. 140. But it often happeus that though several car- pels unite to lorm a compound pistil, there is but one cell in the ovary. This is because tho separate carpcl- lary leaves have not been folded before uniting, ?jiit have been joined edge to edge, or rather with their edges slightly turned inwards. In those oases the seeds cannot, of course, be in the centre of tho ovary, but will bo found on the walls, at the junction ot the carpels (Figs. 150, 151). In home plants the ovary is one-colled, and tho seeds are arranged round a column which ri^,es from the bottom '1 of the coll (Figs. 152, 153). This case is riys IV-', 153. explained by the early obhteration of the partitions, which must at iirst have mot in the centre of the cell. 141. In all cases the line or projection to which seeds are attached is called tho jdawnta, and the term placentation has reference to the manner in which the placentas are arranged. In the simple pistil the placentation is manjindl or sutaral. In the syncarpous pistil, if the dissepiments mi et in the centre of the ovary, thus dividing it into si parate cells, the placenta- tion is central or ; if thv ovary is one-celled bears the seeds on its walls, tho placentation \% paricf-o^*. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrati
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, booksubjectpl
