A KEY TO THE FAMILIES 



c. Pistils united below into a lobed or 



beaked ovary. 

 d. Water plants with floating leaves. 



Nymphaceae 156 

 d. Terrestrial or land plants. 



e. Pistils forming a ring; fila- 

 ments united. Malvaceae 284 

 e. Pistils not forming a ring. 

 f. Pistils inserted on a convex 

 receptacle; stamens at- 

 tached to the calyx. 



Rosaceae 218 



f. Receptacle not convex; sta- 

 mens not attached to the 

 calyx. Papaveraceae 160 



b. Pistil one, the styles and stigmas often 



several. 

 c. Ovary one-celled. 



d. Style and stigma one. 



e. Fruit a drupe (stone-fruit). 



Drupaceae 216 

 e. Fruit an akene tipped with a 



tail. Rosaceae 218 



d. Styles or stigmas more than one. 

 e. Sepals falling as the flowers 



expand. 



f. Sepals two or three; fruit 

 a capsule. 



Papaveraceae 160 

 f. Sepals four or six; fruit a 



berry. Ranunculaceae 126 

 e. Sepals persistent; low shrubs. 



Cistaceae 304 

 c. Ovary more than one-celled. 



d. Water plants with floating leaves. 



Nymphaceae 156 

 d. Plants not growing in water. 

 e. Leaves with smooth margins 

 and with transparent dots. 



Hypericaceae 29? 

 e. Leaves neither smooth-edged, 

 nor with transparent dots. 



Malvaceae 284 



Stamens ten or fewer in number. 

 b. Stamens of the same number as the 



petals and opposite them. 

 c. Ovarv more than one-celled; calyx 



four- to five-cleft. Rhamnaceae 282 

 c. Ovary one-celled. 



d. Anthers opening by uplifted 



valves. Berberidaceae 153 



d. Anthers opening by longitudinal 



slits. Portulacaceae 120 



b. Stamens not of the same number as the 

 petals, or if of the same number, al- 

 ternate with them. 

 c. Ovaries two or more, separate or 



partly united. 



d. Stamens united with each other 

 and with the large thick stigma. 



Asclepiadaceae 374 

 d. Stamens free from each other 



and from the pistils, 

 e. Stamens inserted on the 



receptacle*. 

 f. Leaves and stems fleshy. 



Crassulaceae IQJ 

 f. Leaves and stems not 

 noticeably fleshy. 



xvi 



