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TETRANDRIA. 



I. Monogynia and Digynia. 

 A. Flowers comjMe. 



a. Calyx double; the interior calyx adnate 

 to the ovary. Corolla, gamopetalous. 



1. Dipsacus. 



b. Calyx simple. Corolla gaiaopetaloiiSf 

 inferior. 



1. Plautago. — Corolla-limb regular, 4- part- 

 ed. Stigma filamentose. Capsule cir- 

 cumscissile. 



2. Gentiaua. — Ovary 1. Placentae 2. Style 

 short. Stigmas 2, flat and thin. Cap- 

 sule septicidal. Seeds minute. 



3. Microcala (Cicendia). — Ovary 1. Pla- 

 centae 2. Style filiform. Stigma pel- 

 tate. Seeds minute. 



c. Corolla gamopelalous, superior. 



1. Galium. — Corolla rotate. Fruit a 2- 

 coccous schizocarp. 



d. Corolla 4'p)elalous, inferior. 



1. Euonymus. — Petals inserted on a glan- 

 dular disc. Stamens inserted on the 

 same disc, and alternating with them. 

 Fruit a capsule. Shrub. 



