(5) FRÉDÉRIC N. "WILLIAMS. DU GENRE CERASTIUM. 897 



Species in tria subgenera disponantur : 



Subgenus I. Dichodon. — Petala profunde emarginala. Styli 3. Cap- 

 sula recta, dentibus 6 erectis vel patulis margine subrevolutis dehiscens. 

 — Herbse annuse vel perennes. 



Subgenus II. Strephodon. — Petala incisa vel emarginata. Styli 3 vel 

 5 (interdum 4). Capsula recta vel rarius curvata, dentibus 6 vel 10 apice 

 circinato-convolutis, margine non revolutis, dehiscens. — Herbse annuse 

 vel perennes, dichotome ramosse, multiflorse, rarius simplices, corym- 

 boso-vel subumbellatim cymosse. 



Subgenus III. Orthodon. — Petala emarginala, varie biloba, vel laci- 

 niata. Styli 5. Capsula recta (insuper interdum apice leviter curvula) vel 

 plus minus e basi curvata, plerumque calyce longior, rarius brevior; 

 dentibus 10 erectis vel patulo-rectis, dorso planis vel saepius margine 

 revolutis, dehiscens. — Herbse annuse vel haud ssepius perennes, habitu 

 et florum dispositione dichasiiformi varise. 



Subgenus I. — DICHODON. 



* Species annuae. 

 C. anomalum Waldst. et Kit., C. mauretanicum Pomel. 



** Species perennes. 



C. trigynum Till., C. melanandrum Maxim. 



Subgenus II. — STREPHODON. 



Ser. 1. Recticapsulares. — Capsula matura recta, nervis distinctis aut 

 simplici aut duplici dentium numéro percursa. Species perennes, rarius 

 annuse. 



A. Capsula matura nervis distinctis simplici dentium numéro percursa. 

 a. Capsula demum dentibus 10 dehiscens. 



