A KEY TO THE FAMILIES 
PAGE 
b. Ovary two to several-celled. _ 
c. Ovary two-celled; corolla irregular. 
Polygalaceae 278 
c. Ovary three or more-celled; corolla 
regular or nearly so. 
! d. Stamens not attached to the 
corolla. . 
e. Style one; leaves simple. 
Ericaceae 340 
e. Styles more than one. 
f. Styles three; erect spiny 
shrub. Fouquieriaceae 294 
f. Styles five; low herbs. 
Oxalidaceae 272 
d. Stamens attached to the corolla, 
plants without green foliage 
_  Monotropaceae 356 
a. Stamens five or fewer in number. 
b. Corolla regular. 
c. Stamens free from the corolla. 
Ericaceae 340 
c. Stamens attached to the corolla. 
d. Pistil one. 
e. Stamens of the same number 
as the corolla lobes and op- 
posite them. 
Primulaceae 362 
e. Stamens alternate with the 
corolla lobes or fewer. 
f. Ovary one- or two-celled. 
g. Styles two or occasional- 
ly one. 
h. Capsule usually 
many-seeded; sepals 
united. 
Hydrophyllaceae 402 
h. Capsule few-seeded; 
sepals separate. 
Convolvulaceae 380 
g. Styles one or none. 
h. leaves opposite. 
i. Trees with pinnate 
leaves. Oleaceae 366 
i. Herbs with simple 
smooth-edged 
leaves. 
Gentianaceae 368 
h. Leaves alternate. 
i. Ovary one-celled; 
leaves with three 
leaflets. 
Menyanthaceae 380 
i. Ovary two-celled; 
leaves various. 
Solanaceae 458 
f. Ovary three- or four-celled. 
g. Style one; ovary three- 
celled. 
Polemoniaceae 384 
g- Styles two; ovary four- 
. celled. Boraginaceae 422 
d. Pistils two. 
e. Stamens and stigmas united; 
flowers with hood-like ap- 

pendages. Asclepidaceae 374 
e. Stamens and stigmas not 
united; flowers without 
hood-like appendages. 
Apocynaceae 378 
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