A KEY TO THE FAMILIES 


i. Ovules and seeds 
one or two in each 
cell. 
j. Herbs withlobed 
or cut leaves. 
; Geraniaceae 274 
j. Evergreen 
shrubs with var- 
nished leaves. 
Zyzgophyllaceae 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. 
E. Ovary superior. 
a. Stamens more than five in number. 
b. Ovary one-celled. 
c. Placenta one. f 
d. Corolla very irregular; stamens: 
not protruding from thecorolla. 
Fabaceae 242 
d. Corolla nearly regular; stamens 
protruding. Mimosaceae 266 
c. Placentae two; corolla irregular. 
Fumariaceae 168 
XVill 
