180 PENTANDRIA. DiGYNtlA. 



corticate, very convex, with a thick margin, and tln-ee 

 primary, whitish, and some\\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 swamps from New York to Georgia. Plentiful 

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

 plant is tliat of Aciluist-i. 



I'his small genus of about 6 species, is witli the present 

 exception, confined to 'die south of Europe, Barbary and 

 the Levant. 



£61. CONIUM. Z. (Hemlock.) 



Calix entire. Petals unequa], cordately-in- 

 ilcctetl. Fnu^ ovate, gibbous. Seeds 5 -vihhei]^ 

 ribs at first crenatc; intervals flut. Involiicell 

 on one side, mostlv 3 leaved. 



Involucrum 3 to 3-ieaved, leaves complicately pseudo- 

 pinnate. 



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

 gibbous; stem spotted. ^.*crispatv.lii.m. Leaves crisp, ulti- 

 mate segments subsetaccously scumina ed. — Katlier rare; 

 f'hiefiy on inhabited sites, and therefore probably intro- 

 duced, but altered by climate? A well known poisonous 

 plant at preseiU used in medicine. 



Of tills genus there are not probably more than 2 

 genuine species, and those indigenous to Eui-ope. 



£62. SELINUM. L. (Marsh Parsley.) 



fi Fruit roundisii, emarginate at tlie base, 

 margin alated, dorsal ridges 3, obsolete, inter- 

 vals somewhat convex. Involucrum universal 

 and partial many-leaved.'* Sprengel. 



SpECii^s. S. ccmadense. Ferula ccmadensis? L. 

 An European genus, excepting l!ie above species, which 

 requires furtl>er examination. 



£6S. IMPERATORIA. /.. (Mastcrwort.) 



« Fruit roundish-oval, a little compressed, 

 emarginate at the bnse, ridges (on each seed) 3 

 dorsal, o])tnse, intervals fiatly convex, margin 

 alated. //ir{>///cr?c7Ji universal none." Sprengel. 



