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. Handbook of flower pollination : based upon Hermann MuÌller's work 'The fertilisation of flowers by insects' . Fertilization of plants. POLYGON ACEAE 347 A. Diptera. Syrphidac: i. Ascia podagrica F., very common; 2. Eristalis arbustorum Z., skg. and po-dvg.; 3. E. sepulcralis L., comparatively freq.; 4. E. tenax Z., freq.; 5. Melithreptus scriptus Z., skg. and po-dvg.; 6. M. taeniatus il^., do.; 7. Syritta pipiens Z., the commonest visitors. B. Hymenoptera. Apidae: 8. Andrena dorsata K. 5, occasional, skg.; 9. Halictus albipes F. 5, do.; 10. Prosopis armillata 7^'/. S, do. C. Lepidoptera. R

. Handbook of flower pollination : based upon Hermann MuÌller's work 'The fertilisation of flowers by insects' . Fertilization of plants. POLYGON ACEAE 347 A. Diptera. Syrphidac: i. Ascia podagrica F., very common; 2. Eristalis arbustorum Z., skg. and po-dvg.; 3. E. sepulcralis L., comparatively freq.; 4. E. tenax Z., freq.; 5. Melithreptus scriptus Z., skg. and po-dvg.; 6. M. taeniatus il^., do.; 7. Syritta pipiens Z., the commonest visitors. B. Hymenoptera. Apidae: 8. Andrena dorsata K. 5, occasional, skg.; 9. Halictus albipes F. 5, do.; 10. Prosopis armillata 7^'/. S, do. C. Lepidoptera. R Stock Photo
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. Handbook of flower pollination : based upon Hermann MuÌller's work 'The fertilisation of flowers by insects' . Fertilization of plants. POLYGON ACEAE 347 A. Diptera. Syrphidac: i. Ascia podagrica F., very common; 2. Eristalis arbustorum Z., skg. and po-dvg.; 3. E. sepulcralis L., comparatively freq.; 4. E. tenax Z., freq.; 5. Melithreptus scriptus Z., skg. and po-dvg.; 6. M. taeniatus il^., do.; 7. Syritta pipiens Z., the commonest visitors. B. Hymenoptera. Apidae: 8. Andrena dorsata K. 5, occasional, skg.; 9. Halictus albipes F. 5, do.; 10. Prosopis armillata 7^'/. S, do. C. Lepidoptera. Rhopalocera: 11. Pieris rapae Z., casual, skg. The following were recorded by the observers, and for the localities stated.â Knuth (Holstein and Riigen), the honey-bee and the hover-fly Syritta pipiens Z. 'erhoeff (Norderney), the moth Plusia gamma Z. Alfken (Juist), the humble-bee Bombus hortorum Z. 5, and the butterfly Pieris brassicae Z. MacLeod (Flanders), the honey-bee and 2 hover-flies (Bot. Jaarb. Dodonaea, Ghent, vi, 1894, p. 145). Scott-Elliot (Dumfriesshire), 2 Muscids ('Flora of Dumfriesshire,' p. 149). 2476. P. lapathifolium L. (Herm. Miiiler, 'Fertilisation,' p. 314; Schulz, ' Beitrage,' II, p. 199 ; MacLeod, Bot. Jaarb. Dodonaea, Ghent, vi, 1894, p. 145.)â The homogamous flowers of this species belong to classes C to EC. Their mechanism agrees entirely with that of P. Persicaria. Five stamens are generally present, one or more of them not infrequently coming into contact with the stigmas as they bend inwards. Visitors.âHerm. Miiiler observed 3 hover-flies, skg.âi. Ascia podagrica F. 2. Eristalis sepulcralis Z.; 3. Syritia pipiens Z. 2477. P. Hydropiper L. (Kirchner, 'Flora v. Stuttgart,' p. 218; Kerner, ' Nat. Hist. PI.,' Eng. Ed. i, 11, p. 391; Schulz, 'Beitrage,' II, p. 199.)âThe small, inconspicuous flowers of this species are green outside with pink tips; Kirchner says that they are devoid of nectar, the nectaries being completely reduced. Two of the ei

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