KEY TO THE FAMILIES. 



Xlll 



Corolla conspicu- 

 ously bearded on 

 the upper sur- 

 face. 



Corolla not conspic- 

 uously bearded. 

 Ovary 2 or more celled. 

 Stamens free from the 



corolla. 



Stamens on the corolla- 

 tube. 



Stamens 4. 

 Stamens 5. 



Fruit a many- 

 seeded pod or 

 berry. 



Fruit a few- 

 seeded pod. 

 Style 3-lobed. 

 Style undi- 

 vided 

 or 2- 

 cleft. 

 Whitish 

 or yel- 

 low 



chloro- 

 phyll- 

 less 

 plants. 

 Green 

 plants. 



MENYANTHACEAE, 289. 

 HYDROPHYLLACEAE, 297. 



ERICACEAE, 275. 

 PLANTAGINACEAE, 333. 



SOLANACEAE, 314. 

 POLEMONIACEAE, 292. 



CUSCUTACEAE, 291. 

 CONVOLVULACEAE, 290. 



