GENERA OR FAMILIES. 155 



24. Onagraceous Plants. ONAGRACE.E. 



* Stamens eight ; (flowers regular or nearly so). 



(100) Epilobium calyx four-cleft, deciduous ; seeds bearded ; 



flowers purplish or white. 



(101) CEnothera calyx tubular below, four-lobed; seeds not 



bearded ; flowers large, yellow. 



** Stamens two ; (flowers very irregular). 



(102) Circsea calyx deeply two-cleft ; petals two. 



25. Haloragaceous Plants. HALORAGACE.E. 



* Stamens eight (sometimes four or six). 



(103) Myriophyllum monoecious ; stigmas four, sessile on the 



ovary ; fruit tetragonal, separable into four nuts. 



** Stamens one only. 



(104) Hippuris stigma one, sessile on the ovary ; fruit a one- 



celled nut. 



26. Cornaceous Plants. CORNACE.E. 



(105) Cormis petals distinct ; fruit a succulent drupe. 



27. Umbelliferous Plants. UMBELLIFER^E. 



* Umbels simple or imperfectly compound. 



t Fruit without vittce (oil-cysts) ; albumen solid (not fur- 

 rowed) . 



J Fruit laterally compressed. 



(106) Hydrocotyle fruit flat nearly orbicular, of two carpels, 



each with five filiform ridges ; commissure linear ; calyx 

 teeth obsolete. 



