. The origin of floral structures : through insect and other agencies. Plants; Flowers; Flowers. THE PRINCIPLE OF COHESION. 65 position the tracheae of each pair of cords face each other. At this point, then, they have quite lost their strictly axial character of facing the centre, and the axis is therefore no longer concerned in the structure. A little higher the cayities of the ovaries (indicated by the dotted lines) appear between the dorsal cord and the pair of marginal ones ; and now the latter turn their spirals completely towards the ovary cells, having rotated through 90° in all. The o
. The origin of floral structures : through insect and other agencies. Plants; Flowers; Flowers. THE PRINCIPLE OF COHESION. 65 position the tracheae of each pair of cords face each other. At this point, then, they have quite lost their strictly axial character of facing the centre, and the axis is therefore no longer concerned in the structure. A little higher the cayities of the ovaries (indicated by the dotted lines) appear between the dorsal cord and the pair of marginal ones ; and now the latter turn their spirals completely towards the ovary cells, having rotated through 90° in all. The object of this rotation is to enable them to send off cords to the ovules. The second method is well seen in Geraniitm, Pelwrgonium zonale, and Impatiens. A section of the receptacle of the first two, made between the insertion of the stamens and the pistil, shows five groups of three cords each, airanged as in Fig. 13, a. Small portions of the ten staminal cords are SD. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Henslow, George, 1835-1925. New York : Appleton
Size: 1681px × 1486px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecad, booksubjectflowers, booksubjectplants
