— Plate 6. — 



Figs. 1-23. — Darlingtonia calijornica. 



Figs. i-io. — Various stages of the development of the leaf showing espe- 

 cially the development of the da ventralis as part of the lateral lips of 

 the mouth and quite apart from the stipular wings. 



Figs. 4-6 and 10 show the development of the fishtail. 



Fig. 9. — Longitudinal interior view of a leaf of the dimensions of fig. 8; 

 nr, nectar roll; tnr, marginal roll of the fishtail; /, upward fold of the 

 wall of the dome. 



Fig. II. — Diagrams idealizing the development of the nectar roll and its 

 continuation to form the marginal roll of the fishtail; a, a theoretical 

 condition corresponding to the condition actually recorded in plate 

 5-y, b, a theoretical condition further advanced than a, in which the 

 'fold' {see fig. 9) has not fused and the edge of the nectar roll is still 

 evidently confluent with the edge of the marginal roll of the fishtail. 



Figs. 12 and 13. — Supposed appearance of pitchers on the conditions in- 

 dicated theoretically in figs, iia and b. 



Fig. 14. — A mature pitcher on a small plant (the figure is larger than 

 natural size) showing the posture taken in relation to the soil surface, 

 in which the fishtail serves as a ramp leading to the entrance of the 

 dome. 



Fig. 15. — Appearance of mature pitchers of upright posture, front and 

 side view. 



Fig. 16. — External view of the dome of a young pitcher somewhat ad- 

 vanced beyond that of fig. 10. (Goebel published a similar figure). 



Fig. 17. — Seedling, with juvenile leaves only and, as it happens, with 

 three cotyledons. 



Fig. 18. — Surface view of nectar gland in a juvenile leaf. 



Fig. 19. — Surface view of a nectar gland such as seen in fig. 23. 



Fig. 20. — Nectar gland from outer surface of pitcher. 



Fig. 21. — Nectar gland from inner surface. 



Fig. 22. — Surface view of same. 



Fig. 23. — Lateral sectional view of nectar gland with at least two tiers of 

 cells. 



