Key to the Families 

 ** Ovary inferior. 



Trees and shrubs. 



Stamens exceeding the petals in number; fruit a pome. 



ROSACEAE, 195. 

 Stamens as many as the petals and opposite them. 



RHAMNACEAE, 240. 



Stamens as many as the petals and alternate with them. 

 Leaves alternate; fruit a smooth or prickly berry. 



RISES, 192. 

 Leaves opposite; fruit drupe-like. CORNACEAE, 292. 



Herbs. 



Petals and stamens many; fleshy maritime herbs. 



MESEMBRIANTHEMUM, 139. 

 Petals 5 or fewer. 

 Style 1. 



Sepals and petals 4; capsule 4-celled. ONAGRACEAE, 261, 452. 



Sepals and petals 5; capsule 1-celled. LOASACEAE, 255. 



Sepals 2; petals 5; style 3-8-parted; capsule 1-celled. 



PORTULACA, 142. 



Style none; stigmas 4; aquatic plants with whorled leaves. 



HALORAGIDACEAE, 273. 



Styles 4-5; fruit berry-like. ARALIACEAE, 274. 



Styles 2; flowers umbellate or capitate; fruit forming 2 1-celled carpels. 



UMBELLIFERAE, 275. 

 ith jointed stems. CACTACEAE, 257. 



SERIES II. SYMPETAL.AE. 



Petals united, at least below, except in Pyrolaceo,e, Plumbagi- 

 naceae and Oleaceae. 



* Ovary superior. 



Corolla regular. 



Stamens free from the corolla; anthers opening by pores. 



Petals distinct or nearly so. PYROLACEAE, 294. 



Petals united; shrubs or trees. ERICACEAE, 295. 



Stamens adnate to the corolla. 



Stamens opposite the corolla-lobes. 



Style 1 ; fruit capsular, many-seeded. PRIMULACEAE, 298. 

 Styles 5; fruit utricular, 1-seeded. PLUMBAGINACEAE, 301. 



Stamens alternate with the corolla-lobes. 

 Ovaries 2, separate, becoming follicles. 



Filaments distinct. APOCYNACEAE, 304. 



Filaments monadelphous. ASCLEPIADACEAE, 305. 



