. Handbook of flower pollination : based upon Hermann MuÌller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 194 ANGIOSPERMAEâDICOTYLEDONES Nectar is secreted by a fleshy disk below the ovary, stored in the corolla-tube (2-3 mm. long), and protected from the entrance of rain-drops by a ring of white hairs. Many insect visitors are attracted by the long conspicuous inflorescences with their blue-violet flowers. Owing to protandry or protogyny, and the projection of the stigma beyond the anthers in the mature stage, these visitors regularly effect cross-pollination.
. Handbook of flower pollination : based upon Hermann MuÌller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 194 ANGIOSPERMAEâDICOTYLEDONES Nectar is secreted by a fleshy disk below the ovary, stored in the corolla-tube (2-3 mm. long), and protected from the entrance of rain-drops by a ring of white hairs. Many insect visitors are attracted by the long conspicuous inflorescences with their blue-violet flowers. Owing to protandry or protogyny, and the projection of the stigma beyond the anthers in the mature stage, these visitors regularly effect cross-pollination. Visitors.âThe following were recorded by the observers, and for the localities stated.â Knuth, the honey-bee, 2 humble-bees, a Lepidopterid, and 3 hover-flies. Harm. Mtiller (Westphalia), 2 bees (Apis mellifica L. 5, skg. and po-cltg., and Prosopis communis Nyl. 5 and $, freq., skg.) and 3 fossorial wasps (i. Psammophila viatica Z. S, skg.; 2. Cerceris labiata F. j and S, freq., skg.; 3. C. quinquefasciata Rossi, skg.): (Thuringia), a hawk-moth (Zygaena carniolica Scop., skg.): (Alps), the honey-bee, and the humble-bee Bombus alticola Krchb. 5, skg. Gerstacker (Bozen), 3 beesâI. Xylocopa cyanescens Brull.; 2. X. valga Gerst.; 3. X. violacea Z. (Ent. Nachr., Berlin, 1872, p. 272). Friese (Hungary), the bee Andrena braunsiana Friese 5 freq., 5 rare. Schletterer (Tyrol), 5 beesâi. Andrena pectoralis Per., very rare ; 2. Bombus argillaceus 6'co/i.; 3. B. variabihs Schmiedekn ; 4. Halictus major Nyl.; 5. Xylocopa valga Gerst. von Dalla Torre (Tyrol), 2 beesâHalictus major Nyl. 5, and Xylocopa violacea Z., 5 and S. Alfken (Bozen), the Scoliid Scolia hirta Sckr. } and J, not infreq., skg., and the bee Xylocopa violacea Z. 5, po-cltg. 2123. V. serpyllifolia L. (Herm. Miiller, ' Fertilisation,' pp. 443-4; Kirchner, ' Flora V. Stuttgart,' p. 590 ; Warnstorf, Verb. bot. Ver., Berlin, xxxviii, 1896.)âThe whitish flowers of this species are traversed by veins of a bluish colour. Tho
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