362 Schively — Contributions to the Life History of 



PLATE XXIV. 



Fig. 1. Transverse section of very young stem. 



Fig. 2. Transverse section of older stem. 



Fig. 3. Transverse section of still older stem. 



Fig. 4. Transverse section of stem about the age of that shown in 

 Fig. 2 — much magnified. 



Fig. 5. Portion of leaf, showing vascular bundle, containing crystals. 

 All figures from photo-micrographs. 



PLATE XXV. 



Fig. 1. A fair-sized plant showing leaves in paraheliotropic position. 



Fig. 2. Young plant showing leaves in paraheliotropic position. 



Fig. 3. Young plant showing leaves in nyctitropic position : from 



photographs. 



PLATE XXVI. 



Plant showing position of leaves at n p.m ; from photograph. 



PLATE XXVII. 



Fig. 1. Racemes of purple flowers, showing manner of growth. 

 Fig. 2. Compound raceme of purple flowers. 



Fig. 3. Transverse section of a purple flower-bud. Figs. 1 and 2 from 

 photographs; Fig. 3 from photo-micrograph. 



PLATE XXVIII. 



Fig. 1. Transverse section of purple flower-bud showing nectary. 

 Fig. 2. Transverse section of ovary of green aerial flower. 

 Figs. 3 and 4. Transverse section ; longitudinal section of terrestrial 

 flower-bud ; from photo-micrographs. 



PLATE XXIX. 



Fig. 1. Stamens and pistil from green aerial flower. X 35°- 

 Fig. 2. An enlarged anther from green aerial flower. X 75°- 

 Fig. 3. Stamens and pistil from terrestrial flower. X 35°- 

 Fig. 4. Stages of statninal reduction from terrestrial flower ; 1 consists 

 of filament only, 2 and 3 possess imperfect anthers, 4 is perfect. X 75°- 

 Fig. 5. Microspores from terrestrial flower. X 35°°- 



PLATES XXX and XXXI. 



Series of styles and stigmas showing transitional reduction, taken 

 from three types of flower. Drawn to same scale. 

 Figs. 1 and 2. From terrestrial flower. 

 Figs. 3-7. From green aerial flower. 

 Fig. 8. Immature form, purple flower. 

 Fig. 9. Mature form, purple flower; drawings from photo-micrographs. 



