16 M. Morreu ojt the Nectaries o/" Aquilegia. 



Fig. 3. Stamen still move mctnmovpliosed. 

 a. A very distinct anther-cell. 



h. lludinient of the second. d. Lamina of the connective. 



c. Connective. e. Sac or beginning of the spur. 



Fig. 4. Stamen almost entirely modified. 



a. Loculus of the anther. c. Its belly. 



b._ Spur-shaped sac. d. Nectarial gland. 



e. Lobe, and/, the other lobe of the limb. 

 Figs. 5. and 6. Ulterior modifications of the stamen, where the nature of the 



spur is well determined. 

 Fig. 6. his. Spur-shaped nectary^ where the staminal nature has left all its 

 traces. 

 a. and h. Loculiof the anther. 



c. Intermediai-y part of the connective between the two loculi. 



d. Lobe of the limb of the nectary. 



e. Marginal extension of the anther-cell. 



/. Fissure of the limb. g. Another lobe of the limb. 

 h Filament or support of the nectary. 

 i. Spur. k. Nectarial gland. 

 Fig. 7. Stamen where the connectival elongation is the most evident. 

 Fig. 8. Insertion one within another of the spur-shaped nectaries. 

 Fig. 9. One of the lamellse situated between the stamens and the carpels of 

 the common Columbine. 



Fig. 10. Bud of the natural size, in which the formation of the stamens was 

 observed. 



Fig. H. Androeceum of this bud, considerably magnified. 

 a. and b. Very young stamens ; their anther alone is visible. 



Fig. 12. Stamen of this androeceum separated, greatly magnified. 



Figs. 13. and 14. Young petals of this bud (fig. 10). 



a. Disc. b. Margin. 



c. Prominence indicating the anther-cells. 



Fig. 15. A rather larger bud. 



Fig. 16. Androeceum and flower of this bud deprived of its calyx. 

 a, b, c. Petaloid laminae. d. Stamens. 



Fig. 17. One of these stamens considerably magnified. 



Fig. 18. One of the laminae situated between the stamens and the carpels. 

 a, b. Traces of the anther-cells. 

 c. Connective. d. Filament. 



Fig. 19. Young petals of this bud (fig. 15). 



a. Traces of the anther-cells. 



b. Connective. c. Lamellary margin magnified. 

 Fig. 20. A much larger bud of the natural size. 



Fig. 21. The same stript of its calyx, considerably magnified. 



a. Nectaries. b. Their fitting into each other. c. Stamens. 



Fig. 22. Portion of the anther-cell dissected for the purpose of seeing its 

 tissues. 



A. Endotheca. B. Exotheca. 



a. Endothecal cell. b. Its fibre. 

 Fig. 23. Tissues of the nectarial gland. 



a. Exterior cellular tissue. b. Interior cellular tissue. 



