POLTPETALOUS EXOGENOUS PLANTS. 173 



Sagina. Styles and valves 4-5. 

 Alsine. " '' 3. 



** Valves of the capsule twice as many as the styles. 



Arenaria. Valves of the capsule 2-4 each, soon 2-cleft, 

 Petals entire, 



Stellaria. Valves of the capsule Q-10. Petals 2'cleft, 

 Cerastium. " " 8-10, toothed. 



Tribe IV. Sileneae. Sepals united into a tube. Pe- 

 tals and stamens inserted on the stipe of the ovarg. Stipules 

 none. 



Silene. Styles 3. Capsule 6-tootlied. 



Saponaria. Styles 2. Capsule 4-toothed. 



Agrostemma. Styles 5. Capsule 5-tootlied. 



PARONYCHIA, Touru. 



P. DiCHOTOMA, Nutt. Smooth; stems slender, erect; 

 leaves linear, subulate— those of the barren stems imbri- 

 cated; cymes fastigiate, diffuse; septals linear, 3-ribbed, 

 slender, pointed; ptetals minute, bristle-like. July-No- 

 vember. Stems 6-12' high. 



P. Drummondi. Minutely pubescent ; stem erect, branch- 

 ing above into numerous cymes ; leaves (of the branches) 

 linear-oblong, short, the uppermost mucronate ; calyx tur- 

 binate at the base, with a ring of hooked hairs; sepals 

 broadly scarious and dilated above, the back produced into 

 a somewhat recurved horn ; sterile setas very minute ; 

 stem about 10 inches high ; sepals reddish-brown, the sca- 

 rious margins and horns white. Annual. — Drummo7id. 



ANYCHIA. 



Sepals 5, distinct, slightly mucronate at the apex. Petals 

 none. Stamens 2-3, inserted on the base of the calyx. 

 Style very short. Stigmas spreading. Utricle exserted. 

 Seed erect. Radicle inferior. An erect, slender annual, 



