KEY TO THE FAMILIES. xi 



Corolla not conspicu- 

 ously bearded. Hydrophyllaceae, 202. 

 Ovary 2 or more celled. 

 Stamens free from the 



corolla. Ericaceae, 188. 



Stamens on the corolla- 

 tube. 

 Stamens 4. Plantaginaceae, 232. 



Stamens 5. 



Fruit a many- 

 seeded pod or 



berry. Solanaceae, 217. 



Fruit a few- 

 seeded pod. 

 Style* 3-lobed. Polemoniaceae, 197. 

 Style undi- 

 vided or 

 2-cleft. 

 Whitish or 

 yellow 

 chloro- 

 p h y 1 1- 

 1 e s s 



plants. Cuscutaceae, 196. 

 Green 



plants. Convolvulaceae, 196. 

 Ovary inferior. 



Anthers united into a ring or tube (syn- 

 genesious). 

 Flowers in an involucrate head on a 



common receptacle. Compositae, 241. 



Flowers separate, not involucrate. Campanulaceae, 239. 



Anthers not united. 



Stamens on the ovary. Campanulaceae, 239. 



Stamens on the corolla. 



Stamens 1-3. Valerianaceae, 237. 



Stamens 4-5. 



Ovary 1-celled; flowers in a 



dense involucrate head. Dipsacaceae, 239. 



Ovary 2-5-celled ; flowers not in 

 an involucrate head. 

 Leaves opposite or whorled, 

 when opposite with sti- 

 pules. Rubiaceae, 233. 

 Leaves opposite, without 

 stipules. Caprifoliaceae, 235. 



