pee eel 
288 Umbellaceae 
a. Leaves 3-ternate; leaf-segments 6—18 mm. long; pedicels 
8—10 mm. long. E. 
L. laevigatum C. & R. 
aa. Leaves |2-ternate; leaf-segments 5—-10 cm. long; pedicels 
2—6 mm. long. E. (P. simplex.) 
L, platycarpum ©. & R. 
ZZ. Oil-tubes 1—3 in each interval; flowers white. FE. 
L. cusickii C. & R. 
YY. Wings narrow; oil-tube | in each interval. 
b. Ovaries glabrous; involucel-bracts lanceolate or setaceous; pedi- 
cels 24 mm. long. W.C. E. P 
L, triternatum ©. & R. 
bb. Ovaries puberulent. 
c. Ribs of the fruit filiform; involucel-bracts linear-setaceous; ped- 
icels 2—4 mm. long. E. (P. triternatum macrocarpum. ) 
L. robustius C. & R. 
cc. Ribs of the fruit sharp; involucel-bracts none; pedicels 4-7 
mm. long. E. (P. triternatum alatum.) 
L. alatum C. & R. 
XX. Leaves usually much dissected into short segments. 
d. Plant glabrous thruout; flowers yellow. 
e. Oil-tube | in each interval. E. 
L. grayl C. & R. 
ee. Oil-tubes several in each interval. 
f. Petioles with white-scarious margins; fruit puberulent. E. 
L. sandbergii ©. & R. 
ff. Petioles without white-scarious margins; fruit glabrous. 
g. Fruit 5 mm. long, its wings very narrow. E. 
L. microcarpum C. & R. 
gg. Fruit 7—8 mm. long, its wings somewhat wide. E. 
L. donnellii C. & R. 
dd. Plant puberulent thruout. 
h. Umbel rays 2.58.5 cm. long; fruit glabrate, 10—-16 mm. 
long, 4—5 mm. wide, its wings half. as wide as the body or less. 
W.E. (P. triternatum brevifolium.) 
L. brevifolium C. & R. 
hh. Umbel rays 1—3 cm. long; fruit pubescent, 8 mm. long, 
6—7 mm. wide, its wings more than half as wide as the body. E. 
L. jonesii C. & R. 
MM. _ Peduncles stout, sometimes much swollen at the top. 
SS. Fruit linear. E. L. bicolor C. & R. 
i. Fruit 6-—14 mm. long, 3—6 mm. wide. 
j. Oil-tubes 3 in each interval, small; plant glabrous. E. (P. nuttallii.) 
L. platyphyllum ©. & R. 
jj. Oil-tubes I—2 in each interval, large. 
k. Plant more or less puberulent; involucel-bracts linear or setaceous. EF. 
L. anomalum Jones 
kk. Plant glabrous; involucel-bracts none. W. E.  (P. leiocarpum.) | 
L. nudicaule C. & R. (Indian Consumption-plant) 
i. Fruit 18—28 mm. long; 6—12 mm. wide. E. | 
L. suksdorfii C. & R. 
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