The origin of floral structures through insect and other agencies . ular to the filaments, corresponding to the weight ofthe insect; while the third and upward force is that exertedby the filaments to counteract the resultant of the two former.* The origin of the adhesion between the stamens and theouter whorls is revealed by anatomical investigations; forthe rule is, as described in the case of Prunus, that the fibro-vaseular cords of the stamens arise by division from those ofthe outer whorls whenever they are superposed to them. In other words, when adhesions are seen between thefloral whor
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The origin of floral structures through insect and other agencies . ular to the filaments, corresponding to the weight ofthe insect; while the third and upward force is that exertedby the filaments to counteract the resultant of the two former.* The origin of the adhesion between the stamens and theouter whorls is revealed by anatomical investigations; forthe rule is, as described in the case of Prunus, that the fibro-vaseular cords of the stamens arise by division from those ofthe outer whorls whenever they are superposed to them. In other words, when adhesions are seen between thefloral whorls, by being superposed to one another, then a * See also Figs. 38, 3[), and 40, pp. 124-126, and consult text. 82 THE STRUCTURE OF FLOWERS. fusion of their respective cords will he found. If the membersarise freelj, as in Eatiunculacece and Cruciferce, then their cordsare inserted into the axis, having arisen by radial divisionor lateral chorisis. In the case of the gynandrons pistil, the stamens havetheir fibro-vascular cords more or less imbedded in the recep-.