KEY TO THE FAMILIES. 



XI 



Herbs. 



Shrubs or trees. 



Leaves pinnately- 



veined; shrubs. 

 Leaves palmately- 



veined; trees. 



Ovules several-many in 



each cell of the ovary. 



Leaves opposite, with 



stipules. 

 Leaves, when opposite, 



without stipules. 

 Stamensonthecalyx. 

 Style 1. 

 Styles 2 or 3. 

 Stamens free from 



the calyx. 

 Style 1. 

 Herbs. 

 Shrubs. 

 Styles 2-5. 



Stamens and 

 calyx uni- 

 ted to the 

 ovary. 



Stamens and 

 calyx 

 free 

 from 

 the 

 ovary. 

 Leaves 

 trifolio- 

 late. 

 Leaves 

 simple. 



GERANIACEAE, 228. 



CELASTRACEAE, 234. 

 ACERACEAE, 235. 



ELATINACEAE, 241. 



LYTHRACEAE, 245. 

 SAXIFRAGACEAE, 184. 



PYROLACEAE, 270. 

 ERICACEAE, 275. 



ARALIACEAE, 254. 



OXALIDACEAE, 229. 

 CARYOPHYLLACEAE, 141. 



II. PETALS MORE OR LESS UNITED INTO ONE PIECE. 



Stamens more numerous than the corolla-lobes. 

 Ovary 1 -celled. 



White or reddish chlorophyll-less parasitic 



or saprophytic herbs. 



Green chlorophyll-bearing herbs, not para- 

 sitic nor saprophytic. 

 Ovary with 1 parietal placenta. 

 Ovary with 2 parietal placentae. 

 Ovary 3-many-celled. 



Stamens united with the base of the corolla. 

 Stamens free from the corolla. 



Chlorophyll-less parasitic or saprophytic 



herbs. 

 Chlorophyll-bearing herbs, not parasitic 



nor saprophytic. 



Stamens as many as the corolla-lobes or fewer. 

 Stamens opposite the corolla-lobes. 



Style 1; fruit a several to many-seeded 



capsule. 

 Styles 5; fruit a 1-seeded utricle. 



PYROLACEAE, 270. 



LEGUMINOSAE, 212. 

 PAPAVERACEAE, 164. 



MALVACEAE, 238. 



PYROLACEAE, 270. 

 ERICACEAE, 275. 



I'KIML LACEAE, 283. 

 PLIMI:A(,INACEAE, 286. 



