. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. LEGUMINOSAE 339 234. Phaseolus L. Nectar-yielding bee-flowers with a stylar brush. The spirally twisted end of the style, with the stigma and the pollen adhering to the brush, projects from the tip of the carina (which is also spirally twisted) when this is depressed, return- ing again when the pressure is removed. Delpino (' Ult. oss.,' p. 55) says that' in some species the style is twisted to the right, in others to the left, and that all intermediate stag
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. LEGUMINOSAE 339 234. Phaseolus L. Nectar-yielding bee-flowers with a stylar brush. The spirally twisted end of the style, with the stigma and the pollen adhering to the brush, projects from the tip of the carina (which is also spirally twisted) when this is depressed, return- ing again when the pressure is removed. Delpino (' Ult. oss.,' p. 55) says that' in some species the style is twisted to the right, in others to the left, and that all intermediate stages exist between a simple falciform curve (P. angulosus, &c.) and a helicoid spiral of 4 to 5 turns (P. Caracalla). 809. P. vulgaris L. (Herm. Muller, 'Fertilization,' pp. 216-17; Kirchner, 'Flora V. Stuttgart,' pp. 515-16; Knuth, ' Bloemenbiol. Bijdragen.')—The flower mechanism of this species was first described by Darwin (Gard. Chron., London, 1857, P- 725, 1858, pp. 824-44, Ann. Mag. Nat. Hist., London, Ser. 3, ii, 1858, pp. 459-64). He also demonstrated by experiment that insect-visits are necessary /. 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 Knuth, Paul, 1854-1899; Knuth, Paul, 1854-1899; Mu?ller, Hermann, 1829-1883; Ainsworth Davis, J. R. (James Richard), 1861-1934. Oxford : Clarendon Press
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