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. PL ANT AGIN ACE AE, 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- 

 phyll- 

 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. 



