LIST OF ILLUSTRATIONS 



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9- 

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13- 

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22. 



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 30. 

 3*- 

 32. 

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41. 



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43- 

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47- 

 48. 



49- 

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Si- 



Nectaries of some Ranunculaceae (from nature) . 

 Atragene alpina L. (after Herm. Miiller) 

 Pulsatilla vulgaris L. (from nature) 

 Pulsatilla vernalis L. (after Herm. Miiller) . 

 Ranunculus glacialis L. (after Herm. Miiller) 

 Ranunculus pyrenaeus L. (after Herm. Miiller) . 

 Ranunculus parnassifolius L. (after Herm. Miiller) 

 Ranunculus Flammula L. (after Herm. Miiller) . 

 Ranunculus auricomus L. (after Herm. Miiller) . 

 Caltha palustris L. (after Herm. Miiller) 

 Trollius europaeus L. (after Herm. Miiller) . 

 Helleborus foetidus L. (from nature) . 

 Helleborus viridis L. (from nature) 



Nigella L (from nature) 



Aquilegia vulgaris L. (from nature) 



Delphinium elatum L. (after Herm. Miiller) 



Stages in Specialization of the Nectaries of Aconitum (after Kronfeld) 



Map showing the distribution of the genera Aconitum and Bombus 



Kronfeld) 



Aconitum Napellus L. (after Herm. Miiller) 

 Aconitum Lycoctonum L. (after Herm. Miiller) . 

 Berberis vulgaris L. (after Herm. Miiller) . 

 Chelidonium majus L. (after Hildebrand) 

 Diclytra spectabilis DC. (after Hildebrand) . 

 Corydalis cava Schweigg. et Kort. (from nature) 

 Fumaria officinalis L. (after Hildebrand) 

 Nectaries of some Cruciferae (after Prantl) . 

 Matthiola incana R. Br. (from nature) . 

 Nasturtium sylvestre R. Br. (after Herm. Miiller) 

 Arabis alpina L. (after Herm. Miiller) . 

 Sisymbrium (from nature) .... 

 Lunaria annua L. (from nature) . 

 Draba aizoides L. (after Herm. Miiller) 

 Kernera saxatilis Reichb. (after Herm. Miiller) 

 Teesdalia nudicaulis R. Br. (after Herm. Miiller) , 

 Biscutella laevigata L. (after Herm. Miiller) 

 Reseda odorata L. (after Herm. Miiller) 

 Viola calcarata L. (after Herm. Miiller) 

 Viola biflora L. (after Herm. Miiller) . 

 Viola pinnata L. (after Herm. Miiller) . 

 Viola arenaria DC. (after Herm. Miiller) 

 Polygala comosa Schk. (after Herm. Miiller) 

 Polygala Chamaebuxus L. (after Herm. Miiller) 

 Polygala alpestris Reichb. (after Herm. Miiller) 

 Gypsophila paniculata L. (after Herm. Miiller) 

 Gypsophila repens L. (after Herm. Miiller) . 

 Dianthus deltoides L. (after Herm. Miiller). 

 Dianthus superbus L (after Herm. Miiller) 

 Dianthus Carthusianorum L. (from nature) . 

 Silene rupestris L. (after Herm. Miiller) 

 Silene acaulis L. (after Herm. Miiller) . 

 Cherleria sedoides L. (after Herm. Miiller) . 



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