180 PENTANDRIA. DIGi^NIA. 



corticate, very convex, with a thick margin, and three 

 primary, whitish, and somew hat acute ridges, intervals 

 convex. — The 2 other primary ridges of the 5 are conflu- 

 ent in the suberose margin, but can still be distinguished 

 from it. 



In open sM'amps from New York to Georgia. Plentiful 

 in New Jersey, near to Philadelphia. The habit of this 

 plant is that of Aethusa. 



This small genus of about 6 species, is with the present 

 exception, confined to the south of Europe, Barbary and 

 the Levant. 



S6l. CONIUM. /.. (Hemlock.) 



Ca/iic entire. Petals unequal, cordately-in- 

 flected. Fnit^ ovate, gibbous. Seeds 5v\\i\wi\^ 

 ribs at first crenate; intervals flat. Involucell 

 on one side, mostly 3 leaved. 



Involucrum 3 to 5-leaved, leaves compllcately pseudo- 

 pinnate. 



Species. 1. C. vmciihitiim. Fruit ovate, smooth and 

 gibbous; stem spotted. p>.*cnspatulum. Leaves crisp, ulti- 

 mate segments subsetaceously acumina ed. — Hatiier rave; 

 chiefly on inhabited sites, and therefore probably intro- 

 duced, but altered l)y climate' A well known poisonous 

 plant at present used in med'xine. 



Of this genus there are not probably more than 2 

 genuine species, and those indij^enous to Europe. 



262. SELINUM. L. (Marsh Parsley.) . 



ii Fruit roundisi), emarginate at the base, 

 margin alated, dorsal ridges 3. obsolete, inter- 

 vals somcNvhat convex. Inxolucrum universal 

 and partial many-leaved." Spkengel. 



Species. «S'. canadense. Fenda canadensis? L. 

 An European gtnus, excepting the above species, which 

 requires further examination. 



265. IMPERATORIA. /.. (iMasterwort.) 



"Fruit roundish-oval, a little compressed, 

 rmarginate at the base, ridges (on each seed) 3 

 dorsal, obtuse, intervals flatly convex, margin 

 alated. /?iroi?tc?'wm universal none." Sprexgel. 



