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, L.iah^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\'e to show the nectar-co\er y :-, 4-ii. 

 ft, anthers ; CO, corolla ; ^r, style ; n, nectary ; o-:\ ovary ; j, sepals ; sii, nectar-ctner ; j/, stigma. 



neenbl.,' p. 310; Schuiz, ' Beitrage,' II, pp. 113-15.) — The plants of this specie;- 

 examined by Hermann Miiller in the canton Graubiinden were homogamous and 

 markedly heterostylous-dimorphous, the two forms exhibiting strong secondary 

 differences besides those relating to the reproductive organs. The former were 

 found by Schuiz to be less clearly pronounced in the Tyrol, and were in some cases 

 altogether absent. In that district, for example, the relative sizes of the different 

 parts of the flowers were fairly constant, and the two forms usually agreed as to the 

 nectaries and ovaries. Schuiz found the styles of short-styled flowers to be 4-4^ mm. 

 long, and those of long-styled ones 8-9 mm. The stigmatic papillae of the former 

 appeared to be larger than those of the latter. The flowers present the same colour 

 change as in P. officinalis, but the blue is darker and more intense. 



Visitors. — Loew saw the following in the Berlin Botanic Garden. — 



A. Diptera. Syrphidae : i. Cheilosia pulchripes Lw., settled on corolla ; 2. 

 Svrphus corollae Z'., do. B. Hymenoptera. Apidae: 3. Apis mellifica Z. 5, vainly 



