. Handbook of flower pollination : based upon Hermann MuÌller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 164 ANGIOSPERMAEâDICOTYLEDONES possibility of automatic self-pollination is apparently not precluded. Plants observed by Warming in the Scandinavian highlands were also strongly protandrous, as were those examined by Schulz in the Tyrol. The latter describes the plant as gynodioe- cious, rarely gynomonoecious, very rarely androdioecious or andromonoecious. Visitors.âLoew observed the following in Switzerland (' Beitrage,' p. 60).â Diptera. Bombyliidae: i. Ar
. Handbook of flower pollination : based upon Hermann MuÌller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 164 ANGIOSPERMAEâDICOTYLEDONES possibility of automatic self-pollination is apparently not precluded. Plants observed by Warming in the Scandinavian highlands were also strongly protandrous, as were those examined by Schulz in the Tyrol. The latter describes the plant as gynodioe- cious, rarely gynomonoecious, very rarely androdioecious or andromonoecious. Visitors.âLoew observed the following in Switzerland (' Beitrage,' p. 60).â Diptera. Bombyliidae: i. Argyromoeba sinuata i^a//.; 2. Bombylius minor Z. Herm. Mtillerâin the same countryâsaw numerous Lepidoptera, especially â Noctuidae, and flies; also some bees. A. Schulz observed a similar circle of guests in the Tyrol. MacLeod noticed a Muscid in the Pyrenees (Bot Jaarb. Dodonaea, Ghent, iii, 1591. P- 375)-. Fig. 4g. SiUne rupestris, L. (after Herm. MuUer). A, Flower in the first (male) stage. B. Pistil of the same flower with the branches of the style still closely apposed, and stigmas not yet mature. C, Flower in the second (hermaphrodite) stage. D. Flower in the third (female) stage. 411. S. acaulis L. (Herm. Mtiller, 'Fertilisation,' p. 129, 'Alpenblumen,' pp. 194-7; MacLeod, Bot. Jaarb. Dodonaea, Ghent, iii, 1891, pp. 375-6; Ricca, Atti Soc. ital. sc. nat., Milano, xiii, 1870.)âThis species is trioecious. The markedly protandrous hermaphrodite red flowers are crowded together in great numbers, and are visited by so many insects that there is scarcely any or no necessity for automatic self-pollination. In some places, however, none of the flowers are bisexual (Schulz, Warming). Ekstam says that in dioecious plants in Nova Zemlia the diameter of red or white corolla is 6-12 mm. The only unisexual flowers there observed were male; the bisexual ones wereâas elsewhereâprotandrous. According to Andersson and Hesselman (' Bidrag till Kanned. om Spetsbergens o. Beeren Ei
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