30 BOTANICAL GAZETTE [july 



Fig. 31. — Habit sketch of an old seedling (stage XVII), near end of grow- 

 ing season, showing the development of rhizomes from the basal axillary buds; 



X0.5. 



Fig. 32. — Transverse section of the margin of the blade of a mature leaf, 



showing the collenchymatous strand; X210. 



Figs. 33-35. — Series of successive transverse sections through the upper 

 part of a node, showing the insertion of a branch which has no central bundle 

 developed in its basal internode. 



Fig. 36. — Transverse section of the stele of the basal internode of a mature 

 inflorescence axis; X45. 



Figs. 37-41. — Series of successive transverse sections through the upper 

 part of a node, showing the insertion of a branch in which the central bundle 

 has developed in the basal internode. 



PLATE IV 



Figs. 42-45. — Series of successive transverse sections through the upper 

 part of a node, showing the insertion of an inflorescence axis; X 50. 



Fig. 46. — Longitudinal section through the apex of an inflorescence axis, 

 showing the origin of the opposite bracts, the axillary flowers, and the primordia 

 of the calyx on the lower flowers; X 50. 



Fig. 47. — Longitudinal section of a young flower, not quite median, 

 showing the bract, calyx, corolla, one of the stamens, and the edge of carpel; 

 X50. 



Fig. 48. — Longitudinal section of a young flower, made perpendicular to 

 that shown in fig. 47, along the line mn, showing the two large stamens free 

 from the corolla; X50. 



Fig. 49. — Sagittal section of a slightly older flower, showing the formation 

 of the ovarian cavity; X 50. 



Fig. 50. — Transverse section (very slightly oblique) of a flower of about 

 the same age as that shown in fig. 49, showing the arrangement of the floral 

 parts, and the two lobes of the carpels; X50. 



Figs. 51-54. — Series of successive transverse sections through a node of 

 an inflorescence axis, showing the insertion of the bundles of the opposite 

 pedicels and bracts with those of the main axis; X 22 . 5. 



