. Comment les plantes poussent [microforme] : une introduction de botanique : structurels avec une flore populaire, ou un arrangement et description des plantes communes, à la fois sauvage et cultivée : illustrée par 500 gravures sur bois. Botanique ; Botanique. § PKOrAGATEn 74 plantes maintenant AKB,. IBO- Fijr, commune de pistil le mille-pertuis, simplement composé de trois simples, 'vith leurs ovaires complètement united, tandis que leurs styles de minces. sepanito ure Fig. 190, la panique de Shruhhy le mille-pertuis, comme le dernier, mais avec les trois styles également augmenté, en un seul, le petit se oidy stigmates[)a- taux ; mais tandis qu'elle s'o

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. How plants grow [microform] : a simple introduction to structural botany : with a popular flora, or an arrangement and description of common plants, both wild and cultivated : illustrated by 500 wood engravings. Botany; Botanique. § 74 now PLANTS AKB PKOrAGATEn, . Fijr- IBO, pistil of Common St. John's-wort, plainly composed of three simple ones, 'vith their ovaries completely united, while their slender styles ure sepanito. Fig. 190, panic of Shruhhy St. John's-wort, like the last, but with the three styles also grown, together into one, the little stigmas oidy se[)a- rate; but as it gets older this style generally splits down into three, and when the pod is ripe it also sf)lit3 into three, plainly showing that this compound pistil consists of three united into one. On turning now to Fig. 8 and Fig. 10 to 12 on the same page, it will be seen that the pistil in Morning-Glory and in Lily comimumi puiiu of iwo mill ihrce crii3. 1$ a compouud ouc, madc of three united even to their stigmas. This is shown externally, by the stigma being some- what three-lobed in both. And it becomes ]>erfectly ev'^ tit on cutting the ovary in two, bringing to view the three cells (Fig. 12, as iu r'ig. 189, 190), each an- swering to one simple ovary. ; ! M 216. So compound ovaries generally have as many cells as there are simple pistils or pistil-leaves in their composition ; and have the placentas (199) bearing the seeds all joined in the centre: that is, the placentas or compound placenta in the axis. But sometimes the partitions or divisions between the cells vanish, as in Pinks: then the compound pistil is only one-celled. And sometimes there never were any partitions; but the pistil was formed of two, three, or more open pistil-leaves grown together from the first by their edges, just as petals join to make a monopetalous corolla. Then the ovules or seeds, or the placentas that bear them, are parietal, that is, are borne on the parietes or wall of the ovary. Fig. 191 is the lo

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• bookcentury1800
• bookdecade1850
• booksubjectbotany
• bookyear1858