
A KEY TO THE FAMILIES 
c. Pistils united below into a lobed or 
beaked ovary. 
d. Water plants with floating leaves. 
Nymphaceae 
d. ieee or land plants. 
. Pistils forming a ring; fila- 
ments united. M alvaceae 
e. Pistils not forming a ring. 
f. Pistils inserted on a convex 
receptacle; stamens at- 
tached to the calyx. 
Rosaceae 
f. Receptacle not convex; sta- 
mens not attached to the 
calyx. Papaveraceae 
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 
e. Fruit an akene tipped with a 
tail. Rosaceae 
d. Styles or stigmas more than one. 
e. Sepals falling as the flowers 
expand. 
f. Sepals two or three; fruit 
a capsule. 
Papaveraceae 
f. Sepals four or six; fruit a 
berry. Ranunculaceae 
e. Sepals persistent; low shrubs. 
Cistaceae 
c. Ovary more than one-celled. 
d. Water plants with floating leaves. 
Nymphaceae 
d. Plants not growing in water. 
e. Leaves with smooth margins 
and with transparent dots. 
Hy pericaceae 
e. Leaves neither smooth-edged, 
nor with transparent dots. 
Malvaceae 
a. 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 
c. Ovary one-celled. 
d. Anthers opening by uplifted 
valves. Berberidaceae 
d. Anthers opening by longitudinal 
slits. Portulacaceae 
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. 
A sclepiadaceae 
d. Stamens free from each other 
and from the pistils. 
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160 
216 
218 
160 
126 
304 
156 
292 
284 
282 
152 
I20 
374 
e. Stamens inserted on the 
receptacle. 
f. Leaves and stems fleshy. 
Crassulaceae 
f. Leaves and stems not 
ncticeably fleshy. 
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