. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 38 ANGIOSPERMAE—DICOTYLEDONES to the earl}' time of flowering, insect visitors are considerably fewer in number than in the last species. Here again the stigmas are mature when the flower opens, and curve outwards pretty strongly. The calyx—which is at first 1-5 cm. in diameter—exceeds them in length by several millimetres, they in their turn being longer by about 5 mm. than the as yet quite immature anthers, which project but little beyond the nectaries. An
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 38 ANGIOSPERMAE—DICOTYLEDONES to the earl}' time of flowering, insect visitors are considerably fewer in number than in the last species. Here again the stigmas are mature when the flower opens, and curve outwards pretty strongly. The calyx—which is at first 1-5 cm. in diameter—exceeds them in length by several millimetres, they in their turn being longer by about 5 mm. than the as yet quite immature anthers, which project but little beyond the nectaries. An insect when sucking nectar is obliged to hold on by the downwardly-directed styles, and—if it has come from a flower in the second condition—will dust the stigmas with foreign pollen. The styles are therefore considerably stouter than in the last species, and their curvature—in correspondence with the wider opening of the flower—is greater. The tips of the styles are capitate. The stigmatic papillae are larger than in H. foetidus. They closely cover the dilated end of the style, along the inner side of which they are continued for some distance. The pollen-grains of the two species are of about the same size (0-04 mm. long, and 0-02 mm. broad) and are of a similar elongated ovoid form. In H. viridis the stigmatic papillae are somewhat conical, so that a pollen-grain exactly fits into the space between two of them, and to a certain extent is held 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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