EXOGENOUS OR DICOTYLEDONOUS PLANTS. 429 



Group 2. Ovary coherent -with the calyx, one-celled and one-ovuled, or rarely 

 3-cclled with two of the cells empty, and the third one-ovuled. Seed with 

 little or no albumen. Stamens inserted on the corolla. Limb of the ca- 

 lyx a mere ring, crown, or pappus, or none. Stipules none. 



Stamens distinct. Seed suspended. Leaves opposite. Stamens 3, or rarely 2. 



Flowers often irregular. Valerianace^. 



Stamens 4. Flowers regular, in an involucrate head. Dipsace^. 



Stamens syngenesious. Seed erect. Composite. 



Group 3. Ovary coherent with the calyx, -ndth two or more cells and numer- 

 ous ovules. Seeds albuminous. Stamens inserted with the corolla (epi- 

 gynous) : anthers not opening by pores. Juice more or less milky. 



Corolla irregular. Stamens united by their anthers or filaments. LoBELiACEiE. 

 Corolla regular. Stamens distinct. Campanulace^. 



Group 4. Ovary free from the calyx, or sometimes coherent with it, with two 

 or more cells and few or many ovules. Seeds albuminous. Stamens in- 

 serted with the corolla, or rarely somewhat coherent with its base, as many, 

 or twice as many, as its lobes : anthers mostly opening by pores or 

 chinks. Ericace.*:. 



Group 5. Ovary free, or rarely coherent with the calyx, several-celled, with a 

 single ovule (or at least a single seed) in each cell. Seeds mostly albu- 

 minous. Stamens definite, as many as the lobes of the (often almost poly- 

 petalous) corolla and alternate with them, or two to four times as many : 

 anthers not opening by j^ores. — Trees or shi-ubs. 



Stamens as many as the lobes of the corolla : no sterile ones. Aquifoliace^e. 

 Stamens more numerous than the lobes of the corolla, and all fertile. 



Flowers polygamous : calyx free. Ebenace.*:. 



Flowers perfect : calyx more or less adnate. STYRACACE.as. 



Stamens as many fertile as the lobes of the corolla and opposite 



them. Sapotace^. 



Group 6. Ovary free, or with the base merely coherent with the tube of the 

 calyx, one-celled, with a free central placenta. Stamens inserted into the 

 regular corolla opposite its lobes ! which they equal in number. Seeds 

 albuminous. 



Shrubs or trees (all tropical) : fruit drupaceous. Mtrsijtace.k. 



Herbs : fruit capsular. Primulace.e. 



Group 7. Ovary free, one-celled, with a single ovule ; or two-celled with 

 several ovules attached to a thick central placenta. Stamens as many as 

 the lobes of the regular corolla or the nearly distinct petals. Seeds albu- 

 minous. 



Ovary two-celled : style single : stamens 4, or rarely less. Plantaginace^. 

 Ovary one-celled : styles and stamens 5. Plumbaginace^. 



Group 8. Ovary free, or rarely partly coherent, one- or two- (or spuriously 



