VaiL: STUDIES IN THE ASCLEPIADACEAE 179 
obscure, and the horn-like projections of the column are also ob- 
scure or lacking, 
New YorkK BOTANICAL GARDEN. 
Explanation of Plates 
PLATE 9. Vincetoxicum Alabamense 
a. Flower enlarged, * 3. 
6. Calyx (without the corolla) enlarged, < 8. 
c. Sepals (showing the two glands) enlarged, « 16. 
d. Ovaries enlarged, < 16. 
e. Pollinia enlarged, 20. 
jf. Diagrammatic transverse section of gynostegium enlarged, 16. 
g, 4. Different aspects of the outer and inner crown (the gynostegium cut off) 
enlarged, 16. 
PLATE 10. Vincetoxicum reticulatum 
a. Flower enlarged, X 3. 
6. Calyx (without the corolla) enlarged, > 8. 
c. Sepal (showing the solitary gland) enlarged, 16. 
d. Ovaries enlarged, « 16. 
¢. Pollinia enlarged, < 20. 
f- Diagrammatic transverse section of gynostegium enlarged, 16. 
e, A. Different aspects of outer and inner crown (the gynostegium cut off) en- 
larged, 16. 
