128 



A NGIOSPERMAEDICOTYLEDONES 



5, skg., and then visiting P. anguslifolia ; 3. Osmia rufa L. 5, skg. Alfken (Bremen ;. 

 4 bees I. Bombus agiorum /^. $ ; 2. B. pratorum L. 9 ; 3. Osmia rufa Z. 5 and $ ; 

 4. Podalirius acervorum L. 5 and S; Schmiedeknecht (Thuringia), 2 bees Bombus 

 hortorum Z. 5, and B. pratorum Z. 5. Friese (Innsbruck), the bee Osmia uncinata 

 Gersl., occasional. Hoffer (Steiermark), the humble-bee Bombus agrorum F. 5. 

 Schulz noticed flowers perforated by Bombus terrester Z. 



Hermann Miiller (Kosmos, Stuttgart, xii, 1883, pp. 214 et seq.) noticed that the 

 bee Anthophora pilipes F. ^ 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 Z. 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 pollinators 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 ^^jj.). (Hildebrand, 'D. Geschlechts- 

 Vert. b. d. Pfl.,' p. 37 ; Herm. Miiller, ' Alpenblumen,' pp. 263-4 ; MacLeod, ' Pyre- 



FlG. 273. Puliii07iaria atirtisti/olia, L.[a.hf-r\\e:rm.M\:\\\t^r). /I. Long-styled flower (x i.M. R. Do., 

 partly dissected from the sied. C. Ovary and nectary of the same ( X 4i). D. Short-styled flower 



(X i4). .. Do., partlydissected from the side. /^ Ovary and nectary of the same (X 4I). d? Corolla- 

 limb of the same, cut through just above the stamens, and seen from above to show the nectar-cover ( x 4I). 

 n, anthers; co, corolla; ^r, style; n, nectary; oj', ovary; s, sepals; sd, nectar-cover; s7, stigma. 



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

 examined by Hermann Miiller in the canton GraubUnden were homogamous and 

 markedly heterostylous-dimorphous, the two forms exhibiting strong secondarj 

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

 found by Schulz to be less clearly pronounced in the Tyrol, and were in some case 

 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 thi 

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

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

 ap^)eared to be larger than those of the latter. The flowers present the same coloui 

 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 ; 

 Syrphus corollae F., do. B. Hymenoptera. Apidat : 3. Apis mellifica Z. 5, vainM 



