| 

ee 
Umbellaceae 285 
PSEUDOCYMOPTERUS 
Caulescent (ours) or not. Leaves 2-pinnate. Flowers various in color; involucre 
none or very rarely of 1—2 bracts; involucel-bracts mostly linear. Calyx-lobes evident. 
‘Fruit oblong, glabrous: dorsal and intermediate ribs very prominent, acute, sometimes nar- 
rowly winged; lateral wings rather wide, thickish, equaling or exceeding the others, distinct 
from those of the other carpel; stylopodium none; oil-tubes 1—4 in each interval, 2—-8 
on the commissure side. (Gk. pseudos—false, -+Cymopterus, a related genus. ) 
A. Leaves on long petioles; leaf-segments acutely hard-tipped. E. 
| P. anisatus C. & R. 
AA. Leaves on short petioles, very pale or glaucous; leaf-segments not so hard-tipped. 
B. Peduncles 3—5 cm. long. 
P. hendersoni C. & R. 
BB. Peduncles 10—20 cm. long. E. 
P. bipinnatus C. & R. 
OXYPOLIS COW-BANE 
Smooth, erect, swamp plants. Leaves simple or pinnate (ours) or ternate or re- 
duced to petioles. Flowers white; involucre-bracts few or none; involucel-bracts few 
(ours) or none. Calyx-lobes evident. Fruit flattened laterally, ovate to obovate, 5 mm. 
long (ours), glabrous; dorsal and intermediate ribs filiform; lateral wings closely applied 
to those of the other carpel, veined dorsally and thus carpel apparently with 5 dorsal 
ribs; stylopodium thick, short, conical; oil-tubes | in each interval, 2—6 on the com- 
missure side. (Probably Gk. oxys—sharp. polion—a plant with a strong odor.) E. 
0. occidentalis ©. & R. 
LEPTOTAENIA 
Perennial, glabrous, usually tall and stout; nearly acaulescent. Leaves usually large, 
pinnately decompound. Flowers yellow or purple; involucre none or of few bracts; in- 
volucel-bracts many, small. Calyx-lobes none or evident. Fruit flattened dorsally, ob- 
long-elliptic, glabrous; dorsal and intermediate ribs filiform or obscure; lateral wings very 
thick, corky; commissure-face with a prominent central longitudinal ridge; stylopodium 
none; oil-tubes 3—6 in each interval, 4—6 on the commissure side, mostly small, some- 
times none. (Gk. leptos=slender, tainia—a band; referring to the filiform fruit-ribs. ) 
A. Foliage puberulent. 
B. Fruit sessile or nearly so; staminate flowers on slender pedicels. 
C. Flowers purple. W. E. 
L. dissecta Nutt. 
CC. Flowers yellow. E. 
L. foliosa C. & K. 
BB. Fruit with pedicels longer than those of the staminate flowers; flowers yellow. 
D. Fruit usually 8—12 mm. long; leaves finely dissected. E. 
L. multifida Nutr. 
DD. Fruit 16—18 mm. long; leaves less dissected. E. 
L. eatoni ©. & R. 
AA. Foliage glabrous. 
E. Leaves finely dissected; segments narrower. 
F. Fruit broadly oblong, 1012 mm. wide, lateral wings prominent, thick; oil- 
tubes conspicuous, 3 in each interval; leaflets filiform. E. 
L, purpureum ©. & R. 
