ees 
f 
180 PENTANDRIA. DIGYNIA. 
corticate, very convex, with a thick margin, and three 
primary, whitish, and somewhat acute ridges, intervals 
‘convex.—The 2 other primary ridges of the 5 are conflu- 
ent mee 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 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. : 
261. CONIUM. L. (Hemlock.) ; 
Caliax entire. Petals unequal, cordately-in- 
flected. Fruit ovate, gibbous. Seeds 5-ribbed, 
ribs at first crenate; intervals flat. Involucell 
on one side, mostly 3-leaved. : 
_Involucrum 3 to 5-leaved, leaves complicately pseudo- 
pinnate. 4 
Species. 1. C. maculatum. Fruit ovate, smooth and 
gibbous; stem spotted. 6. *crispatulum. Leaves Crisp, ulti- 
mate segments subsetaceously acumina‘ed.—Rather rare; 
chiefly on inhabited sites, and therefore probably intro- 
duced, but altered by climate? A well known poisonous 
plant at present used in medicine. ~ 
Of this genus there are not probably more than 2 
genuine species, and those indigenous to Europe. 
262. SELINUM. LZ. (Marsh Parsley.) 
_ & Fruit roundish, emarginate at the base, 
- margin alated, dorsal ridges $, obsolete, inter- 
« vals somewhat convex. Jnvoluerum universal 
_ and partial many-leaved.” Sprencen. 
Species. S.canadense. Ferula canadensis? L. 
European genus, excepting the above species, which 
further examination. 
263. IMPERATORIA. ZL. (Masterwort.) 
Fruit roundish-oval, a little compressed, 
emarginate at the base, ridges (on each seed) 3 
al, obtuse, intervals flatly convex, margin 
alated. Involucrum universal none.” SPRENGEL- 
