1 79 Vail : Studies in the Asclepiadaceae 



obscure, and the horn-like projections of the column are also ob- 

 scure or lacking. 



New York Botanical Garden. 



Hxplaiiation of HIates 



Plate 9, Vincetoxicum Alobamense 



a. Flower enlarged, X 3- 



b. Calyx (without the corolla) enlarged, X 8. 



c. Sepals (showing the two glands) enlarged, X 16. 



d. Ovaries enlarged, X ^^• 



e. Pollinia enlarged, X 20. 



f. Diagrammatic transverse section of gynostegium enlarged, X 16. 



,^, h. Different aspects of the outer and inner crown (the gynostegium cut off) 

 enlarged, X 1 6. 



Plate id. Vincetoxicum reticulalum 



a. Flower enlarged, X 3- 



b. Calyx (without the corolla) enlarged, X ^• 



c. Sepal (showing the solitary gland) enlarged, X 16. 



d. Ovaries enlarged, X '6. 



e. Pollinia enlarged, X 20. 



f. Diagrammatic transverse section of gynostegium enlarged, X l^- 



g. h. Different 'aspects of outer and inner crown (the gynostegium cut off) en- 

 larged, X 16. 



