. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. LEGUMINOSAE 269 A. Araneidae. i. Philodromus aureolus Clerck, lurking on unexploded flowers and the central parts of exploded ones. B. Coleoptera. 2. Apion ulicis Forst.; 3. Meligethes picipes Sturm, po-dvg.; 4. Cryptophagus vini Panz., po-dvg. and searching for nectar. C. Diptera. (a) Muscidae: 5. Hylemia sp., searching for nectar; 6. Lucilia cornicina F., do.; 7. Sepsis nigripes Mg., do. {U) Syrphidae: 8. Eristalis arbustorum Z., po-dvg.; 9. E. pertinax Sc
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. LEGUMINOSAE 269 A. Araneidae. i. Philodromus aureolus Clerck, lurking on unexploded flowers and the central parts of exploded ones. B. Coleoptera. 2. Apion ulicis Forst.; 3. Meligethes picipes Sturm, po-dvg.; 4. Cryptophagus vini Panz., po-dvg. and searching for nectar. C. Diptera. (a) Muscidae: 5. Hylemia sp., searching for nectar; 6. Lucilia cornicina F., do.; 7. Sepsis nigripes Mg., do. {U) Syrphidae: 8. Eristalis arbustorum Z., po-dvg.; 9. E. pertinax Scop., searching for nectar; 10. Melanostoma quadrimaculata Verral, po-dvg. D. Hymenoptera. Apidae: 11. Andrena clarkella K., po-cltg.; 12. Apis mellifica Z. 5, po-cltg. and at times searching for nectar; 13. Bombus lapidarius L., searching for nectar; 14. B. ter- rester Z., do. and po-cltg. E. Thysanoptera. 15. Thrips sp., very freq. 197. Cytisus L. Yellow, homogamous to protandrous, monadelphous bee flowers; with sap enclosed in the tissues of the base of the flower, requiring to be bored for. The pressure exerted by a visitor causes stamens and pistil to protrude from the carina, to which they return when the pressure ceases. Several effective visits are therefore possible. In some species there is a transition to a pumping arrangement. (Cf. C. nigricans.) 647. C. Laburnum L. (Herm. Muller, 'Fertilisation,' pp. 193-5; Kirchner, ' Flora V. Stuttgart,' pp. 475-6; Knuth,' Bloemenbiol. Bijdragen.')—The flowers of this species are of considerable size, and aggregated into conspicuous many-blossomed inflorescences. Kerner says that when they open the pedicels twist round so as to turn the vexillum upwards and the carina downwards. The insertion of the vexillum is bounded in front by a thick fleshy swelling, full of sweet sap. As nectar-guides, the vexillum possesses dark streaks, con- verging basally to this swelling, from which nectar is obtained by boring. The union of alae and
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