PLATE XVI. 



A. — Villarsia nymphajoides, Ventenat : p. 104. 



1. A portion of the throat of the corolla, showing the at- 



tachment of the stamens. 



2. The pistil. 



B. — Polemonium coeruleuni; LinncBus : p. 105. 



1. A portion of the throat of the corolla, showing the in- 



sertion of the stamens. 



2. The pistil, surrounded by an annular disk. 



3. A capsule. 



C. — Convolvulus arvensis, Linnaeus : p. 106. 



1. One of the stamens. 



2. The pistil, surrounded by an annular disk. 

 D, — Solanum Dulcamara, Linnceus : p. 109. 



1. A flower, showing the connivont anthers. 



2. One of the anthers separate, showing the terminal pores. 



3. The pistil. 



