Key to the Families ix 



Ovary more than 1-celled. 

 Herbs. 



Leaves opposite. 



Calyx of 2 distinct sepals. ELATINACEAE, 251. 



Calyx tubular. SILENE, 143. 



Leaves alternate or basal. 



Sepals and petals 4; stamens 6, sometimes 2 or 4. 



Ovary 1-celled, stipitate. CAPPARIDACEAE, 180. 



Ovary 2-celled, not stipitate. CRUCIFERAE, 164. 



Sepals and petals 5; capsule 5-celled. 



Stamens 10; leaves 3-foliate. OXALIDACEAE, 228. 



Stamens 10; leaves pinnate. LIMNANTHACEAE, 237. 



Stamens 5; leaves simple. LINACEAE, 229. 



Shrubs or trees. 



Petals and sepals 4; stamens 6; ovary stipitate. 



ISOMERIS, 181. 



Petals and stamens 2; fruit a simple samara. 



FRAXINUS, 302. 

 Corolla irregular. 



Stamens 10; diadelphous or monadelphous; corolla papilionaceous. 



LEGUMINOSAE, 204. 

 Stamens 5; petals 5, 1 spurred; sepals auricled. 



VlOLACEAE, 253. 



Stamens 6; sepals 2; petals 4, in 2 dissimilar pairs. 



BICDCULLA, 163. 

 Stamens 6-8, monadelphous; petals 3, papilonaceous-like. 



POLYGALACEAE, 230. 



3. STAMENS PERIGYNOUS. 



Stamens on an hypogynous disk or on a disk lining the base of the calyx. 

 Herbs ; disk 1-sided. . RESEDACEAE, 182. 



Trees or shrubs. 



Stamens equaling the petals in number and opposite them. 

 Shrubs; petals commonly hooded; ovary usually 3-celled. 



RHAMNACEAE, 240. 

 Woody vines climbing by tendrils; petals early deciduous. 



VITACEAE, 244. . 



Stamens exceeding the petals in number. 

 Leaves alternate. 



Fruit drupe-like; styles or stigmas 3. ANACARDACEAE, 238. 

 Fruit a double samara; leaves simple. 



ACERACEAE, 240. 



Stamens on the calyx. 



Corolla irregular; fruit a legume. LEGUMINOSAE, 204. 



Corolla regular. 



Stamens more than 10; pistils 1-many. ROSACEAE, 195. 

 Stamens 10; fruit a legume. PROSOPIS, 205. 



Stamens 5-10. 



Calyx campanulate. SAXIFRAGACEAE, 188. 



Calyx tubular. LYTHRACEAE, 260. 



