A KEY TO THE FAMILIES 



PAGE 



i. Ovules and seeds 

 one or two in each 

 cell. 



j. Herbs with lobed 

 or cut leaves. 



Geraniaceae 274 

 j. Evergreen 

 shrubs with var- 

 nished leaves. 



Zygophyllaceae 268 

 i. Ovules and seeds 

 several in each cell; 

 leaflets three. 



Oxalidaceae 272 

 g. Cells of ovary twice as 

 many as the sepals. 



Linaceae 270 

 D. Ovary inferior or more or less so. 



a. Stamens more than ten in number. 



b. Plant spiny; leaves absent or soon 



deciduous Cactaceae 304 



b. Plant not spiny; leaves persisting for 



the season. 

 c. Leaves three-sided, fleshy. 



Aizoaceae 108 

 c. Leaves neither three-sided nor 



fleshy. 

 d. Herbs; leaves rough-hairy. 



Loasaceae 300 

 d. Shrubs or trees. 



e. Leaves opposite; stipules 

 none. 



Hydrangeaceae 206 

 e. Leaves alternate; stipules pre- 

 sent. Pomaceae 214 

 a. Stamens ten or fewer in number. 



b. Ovules and seeds more than one in 



each cell. 

 c. Ovary one-celled; fruit a berry. 



Grossulariaceae 210 

 c. Ovary with two or more cells. 

 d. Stamens four or eight. 



e. Shrubs; filaments two-forked 



at the apex. Hydrangeaceae 206 

 e. Herbs; filaments not two-forked 



at the apex. Onagraceae 312 

 d. Stamens five or ten; styles two or 



three. Saxifragaceae 196 



b. Ovules and seeds only one in each cell. 

 c. Stamens mostly ten; ovary partly 



inferior. Hydrangeaceae 206 



c. Stamens less than ten; ovary 



wholly inferior. 

 d. Stamens five; fruit dry. 



Umbelliferae 332 

 d. Stamens four; fruit fleshy. 



Cornaceae 338 



C. Corolla with petals more or less united. 

 . Ovary superior. 



a. Stamens more than five in number, 

 b. Ovary one-celled, 

 c. Placenta one. 



d. Corolla very irregular; stamens 

 not protruding from the corolla. 



Fabaceae 242 

 d. Corolla nearly regular; stamens 



protruding. Mimosaceae 266 



c. Placentae two; corolla irregular. 



Futnariaceae 168 



xviii 



