KEY TO THE FAMILIES. 



IX 



Ovary 1-celled with a central pla- 

 centa. 



Ovary several-celled. 

 Ovary 5-celled. 

 Ovary 10-20-celled. 

 Calyx more or less coherent with the surface of the 



compound ovary. 

 Ovary more than 1-celled. 



Leaves alternate, with stipules. 

 Leaves opposite, without stipules. 

 Ovary 1-celled. 



Placenta basal; plants leafy. 

 Placenta parietal; plants leafless or with 

 minute leaves. 



PORTULACACEAE, 136. 



OXALIDACEAE, 229. 

 NYMPHAEACEAE, 150. 



ROSACEAE, 197. 

 Philadelphia, 188. 



PORTULACACEAE, 136. 

 CACTACEAE, 244. 



2. Stamens not more than twice as many as the petals. 



Stamens opposite the petals. 

 Ovary 2-4-celled. 

 Ovary 1-celled. 



Anthers opening by uplifted valves. 

 Anthers not opening by uplifted valves. 

 Stamens not opposite the petals. 

 Ovary at least half inferior. 



Ovules and seeds more than one in each cell 



of the ovary. 

 Ovules and seeds but one in each cell of the 



ovary. 

 Petals 5. 



Trees or shrubs; flowers in corymbs. 

 Herbs; flowers in umbels or heads. 

 Petals 2 or 4. 



Stamens 4; fruit a drupe. 



Stamens 2 or 8; fruit indehiscent and 



nut- or bur-like. 

 Style 1 ; stigma 2-4-lobed. 

 Styles or sessile stigmas 4. 

 Ovary wholly superior. 

 Ovaries two or more. 



Ovaries somewhat united at the base, 



separate above. 

 Trees. 

 Herbs. 



Ovaries entirely separate. 

 Stamens hypogynous. 

 Carpels numerous. 

 Carpels 4 or 5. 



Stamens perigynous or epipetalous. 

 Stamens just twice as many as the 



pistils. 

 Stamens not just twice as many 



as the pistils. 

 Leaves without stipules. 

 Leaves with stipules. 

 Ovary only one. 



Ovary 3-5-lobed and beaked with a 

 united style. 



RHAMNACEAE, 236. 



BERBERIDACEAE, 163. 

 PORTULACACEAE, 136. 



ONAGRACEAE, 246. 



Crataegus, 200. 

 UMBELLIFERAE, 255. 



CORNACEAE, 268. 



ONAGRACEAE, 246. 

 HALORAGIDACEAE, 253. 



ACERACEAE, 235. 



SAXIFRAGACEAE, 184. 



RANUNCULACEAE, 151. 

 CRASSULACEAE, 182. 



CRASSULACEAE, 182. 



SAXIFRAGACEAE, 184. 

 ROSACEAE, 197. 



