— Plate 5. — 



Figs. i-io. — Darlingtonia calif jniica. 



Figs. 1-3. — Various juvenile leaves. 



Fig. 4. — A series of sections through a juvenile leaf at levels indicated in 

 the drawings (in mm., the 7 mm. section being proximal). 



Fig. 5. — Sections through the wings of a mature pitcher at various levels 

 (indicated in mim.); at 10 n m. the edges of the basal wings are evi- 

 dent, at 65 n m. the edges of the mouth. 



Fig. 6. — Juvenile leaf which had failed to become ascidiate, except 

 slightly in the petiolar region. 



Fig. 7. — Interior view of the lower half of a large mature pitcher dome; 

 ii, T2, veins of the tube which fuse to enter the fishtail. 



Fig. 8. — Lateral view of the interior of the dome. The hairs and fenes- 

 trations are only partially indicated. 



Fig. g. — Interior of dome looking forward (distally), showing the articu- 

 lation of the nectar roll with the edges of the fishtail. 



Fig. 10. — Interior view of dome looking backward, showing relation of 

 the ala vzntralis with the nectar roll. 



Fig. II. — Sarracenia psittacina. — A young leaf showing the early stage 

 of the infold to form the entrance tube. 



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