@ iO Leaf segnents mostly linear or lanceolate, 
yusually .5 cm. wide or less; if 1 cm. 
ie 4A wide, then entire 
12, Lateral wings thin and chaffy, acute; 
oil tubes appearing as brown lines usually 
16 solitary between each rib, 2-6 on | 
\ the commissural face 4. ln 
2, Lateral wings thickish and blunt; oil 
,, @ tubes wanting or irregular and obscure, 
}@ \ 2-3 between the ribs 
> Leptotaenia 
(G Fruits in which the dorsal ribs are distinctly 
10 olevated and corky, often somewhat winged s~ Angelica 
4 Fruits «not flat, convex and more or less ribbed or j 
@ winged 
Some or all basal leaves simple, cordate, crenately 
/o toothed 3. Zizia 
— 
{, All leaves compound 
@ Fruits linear-oblanceolate or linear-oblong, 
10-20 mm. long, 3-5 times as long as broad, 
qd la\ not at all winged 
. 
jO Low plants with short subterranean stems arising 
, from globose tubers; leaf segments thread- 
4 r 4 Ld ‘ s . 
/ like /0. Leibergia 
iO Brect plants with evident stems arising 
_, ¢ from elongated roots; leaf segnents 
\ broad, toothed j, Osmorhiza 
8 Fruits oval or subglobose, 2-6 mn. long, hardly 
more than twice as long as broad, the ribs 
nA frequently winged 
jo Leaf segnents threadlike, 3-5, 2 mm. wide 
/A or less, entire g, Carum 
Leaf segnents broad, numerous, rarely 
jless than 5 mm. wide, usually 1-2 cm., ; 
‘4 “sharply toothed 
10 
}2, Ribs sharp or winged /g. Ligusticun 
. 4 2 
jp, Ribs rounded on the back, corky j 
j4 Leaves once pinnate; fruits longer 
TT io, than broad 
‘4 Leaves twice pinnate; fruits broader 
- than long 
}2. Sium 
/4, Cicuta 
