A KEY TO THE FAMILIES 



PAG* 



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. 

 c. 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 

 . 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 

 3. 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 

 s m o o t h-e d g e d 

 leaves. 



Centianaceae 368 

 h. Leaves alternate. 

 i. Ovary one-celled; 

 leaves with three 

 leaflets. 



Menyanthaceae 380 

 i. Ovary two-celled; 

 leaves various. 



Solanaccae 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. Asdepidaceac 374 

 e. Stamens and stigmas not 

 united; flowers without 

 hood-like appendages. 



Apocynaceae 378 



XIX 



