KEY TO THE FAMILIES. 



XI 



Corolla not conspicu- 

 ously 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 u n d i - 

 vided or 

 2-cleft. 

 Whitish or 

 yellow 

 chloro- 

 p h y 1 1- 

 1 e s s 

 plants. 

 Green 



plants. 

 Ovary inferior. 



Anthers united into a ring or tube (syn- 



genesious). 

 Flowers in an involucrate head on a 



common receptacle. 

 Flowers separate, not involucrate. 

 Anthers not united. 



Stamens on the ovary. 

 Stamens on the corolla. 

 Stamens 1-3. 

 Stamens 4-5. 



Ovary 1 -celled; flowers in a 



dense involucrate head. 

 Ovary 2-5-celled; flowers not in 



an involucrate head. 

 Leaves opposite or whorled, 

 when opposite with sti- 

 pules. 



Leaves opposite, without 

 stipules. 



HYDROPHYLLACEAE, 202. 



ERICACEAE, 188. 



PLANTAGINACEAE, 232. 



SOLANACEAE, 217. 



POLEMONIACEAE, 197. 



CUSCUTACEAE, 196. 

 CONVOLVULACEAE, 196. 



COMPOSITAE, 241. 

 CAMPANULACEAE, 239. 



CAMPANULACEAE, 239. 

 VALERIANACEAE, 237. 



DIPSACACEAE, 239. 



RUBIACEAE, 233. 

 CAPRIFOLIACEAE, 235. 



