. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. CRUCIFERAE 77 to 4 mm. The cordate shape of the base of the calyx indicates even externally the position of the nectaries. The insertion of each short stamen is surrounded by a moderately large swelling that secretes nectar, of which a large drop is produced on each side, so that as much as half the corolla-tube may be filled with it. The four long stamens are surrounded at their bases by a much smaller swelling that does not secrete nectar. The two sepals e
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. CRUCIFERAE 77 to 4 mm. The cordate shape of the base of the calyx indicates even externally the position of the nectaries. The insertion of each short stamen is surrounded by a moderately large swelling that secretes nectar, of which a large drop is produced on each side, so that as much as half the corolla-tube may be filled with it. The four long stamens are surrounded at their bases by a much smaller swelling that does not secrete nectar. The two sepals enclosing them are therefore but slightly gibbous. The anthers of the four long stamens are placed immediately beneath the opening of the flower, and dehisce by slits about 5 mm. long, which are turned inwards. The anthers of the two short stamens are equally long, but their filaments measure only 2-3 mm., so that they do not reach the stigma, which stands about 8 mm. up the corolla-tube. The four long stamens therefore serve for self-pollination, which is automatically effected by the fall of pollen, or is due to insect-visits. The short stamens—which also dehisce introrsely—serve for cross-pollination: the. --«'. 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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