. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. SAXIFRAGEAE 405 959. S. adscendens L.—The nectar is exposed in this species. Kerner describes the flowers as protogynous. At first only the stigmas are mature, so that cross-pollination may take place; later on the outer anthers bend over the stigmas, and shed their pollen upon them, so that failing insect-visits automatic self-pollination may be effected. In the third stage of anthesis the stigmas shrivel up, while the inner anthers dehisce and offer their
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. SAXIFRAGEAE 405 959. S. adscendens L.—The nectar is exposed in this species. Kerner describes the flowers as protogynous. At first only the stigmas are mature, so that cross-pollination may take place; later on the outer anthers bend over the stigmas, and shed their pollen upon them, so that failing insect-visits automatic self-pollination may be effected. In the third stage of anthesis the stigmas shrivel up, while the inner anthers dehisce and offer their pollen to insect visitors. Lindman says that, on the Dovrefjeld, the flowers are homogamous, and effectively autogamous. 960. S. controversa Sternb.—Kerner describes this species as trimonoecious. 961. S. longifolia Lapeyr.—The white blossoms of this species are aggregated into many-flowered inflorescences : the nectar is exposed. MacLeod describes them as protandrous in the Pyrenees, becoming homogamous towards the end of anthesis. B. 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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