. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 123 A NGIOSPERMAE—DICOTYLEDOh'ES $, skg., and then visiting P. anguslifolia ; 3. Osmia rufa /.. 5, skg. Alfken (Bremen), 4 bees—I. Bombus agroium /". ?; 2. B. pratoium Z. 5 ; 3. Osmia rufa L. 5 and S ; 4. Podalirius acervorum L. j and S; Schmiedeknecht (Thuringia), 2 bees—Bombus liortorum L. 5, and B. pratorum L. 5. Friese (Innsbruck), the bee Osmia uncinata Gers/., occasional. Hoffer (Steiermark), the humble-bee Bombus agrorum F. 5. Schuiz noticed flow
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 123 A NGIOSPERMAE—DICOTYLEDOh'ES $, skg., and then visiting P. anguslifolia ; 3. Osmia rufa /.. 5, skg. Alfken (Bremen), 4 bees—I. Bombus agroium /". ?; 2. B. pratoium Z. 5 ; 3. Osmia rufa L. 5 and S ; 4. Podalirius acervorum L. j and S; Schmiedeknecht (Thuringia), 2 bees—Bombus liortorum L. 5, and B. pratorum L. 5. Friese (Innsbruck), the bee Osmia uncinata Gers/., occasional. Hoffer (Steiermark), the humble-bee Bombus agrorum F. 5. Schuiz noticed flowers perforated by Bombus terrester X. Hermann Miiller (Kosmos, Stuttgart, xii, 1883, pp. 214 et seq.) noticed that the bee Anthophora pilipes F. 5 visited almost exclusively flowers either in the red stage or those just beginning to turn blue. Only a single individual went first to the blue flowers. In the same locality the bee Osmia rufa L. and two humble-bees (Bombus hypnorum Z., and B. hortorum Z.) were also observed, visiting the blue flowers as well as the red, perhaps because during their brief stay they had not acquired the necessary experience. Miiller considers that the blue flowers serve a double purpose ; increasing the conspicuousness of the inflorescence, and also indicating to the more intelligent polHnators the flowers to which their visits should be limited to secure the best results for themselves and the plant. 1982. P. angustifolia L. ( = P. azurea Bess.). (Hiidebrand, ' D. Gcschlechts- Veri. b. d. Pfl.,' p. 37 ; Herm. IMiiller. ' Alpenblumen,' pp. 2''>3-4 : IMacLeod, ' Pyre-. FlG. 27^. Pitlmoiiaria aii^ii^fifu/ia, ^rH^rm.^UWltr). .7, Lonjj ;jt)]ed floWL-ri i ''. /?. Do., partly dissected from the sied. C- Ovary and nectary of tlie same (X 43). I). Short-styled flower (X li). £". Do., partlydissected from the side, /^. Ovaryand nectary of the same (x 4-,). G Corolla- limb of the same, cut through just above the stamens, and seen from abo\'
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