18 Key to the System of 



Fruit lobeless 82 



82. Parasites on roots of other plants; leaves always un- 



developed. 



Herbaceous plants, seldom branched, never green; lobes of 

 the corolla in two unequal sets ; stamens four, the two 

 lower the longest; ovulary one-celled; placentaries two 

 to four, attached to the walls of the fruit-cavity ; seeds 

 numerous and minute. Orobancheae. 414 



Terrestrial or much less frequently semiaquatic or epi- 

 phytal plants; leaves always developed ... ... 83 



83. Leaves often radical or floating ; minute vesicular 



pitchers (ascidia) frequently at or near the leaves. 

 Always herbs, seldom tall; lobes of the corolla in two 

 unequal sets; stamens two only; style obliterated; stigmas 

 two; ovulary one-celled; placentary one, attached to the 

 base of the fruit-cavity ; seeds numerous and minute. 

 Figure 105. Lentibularinae. 415 



Plants hardly ever floating, unprovided with pitchers 84 



84. Fruit many-seeded ... ... ... ... ... 85 



Fruit two- or few-seeded ... ... ... ... 87 



85. Fruit usually one-celled. 



Herbs, not rarely epiphytal, or shrubs, seldom small trees; 

 lobes of the corolla in two unequal sets; leaves opposite, 

 but not rarely one smaller, or some of them basal ; stamens 

 usually four, two imperfect; anthers often somewhat 

 coherent; ovulary one-celled or imperfectly two-celled; 

 placentaries two, attached to the walls of the fruit- cavity; 

 seeds always minute. Gesiieriaceae. 416 



Fruit usually two-celled ... ... ... ... 86 



86. Seeds small or minute. 



Herbs or shrubs, rarely small trees ; leaves opposite, less 

 frequently scattered or partially basal ; lobes of the corolla 

 in two unequal sets ; stamens two or four and then the two 

 lower the longest; ovulary completely two -celled ; placen- 

 taries generally attached to the dissepiment; seeds 

 several or oftener numerous. Figure 104. 



Scropliularinae. 417 



