Umbellaceae 273 
1p : Stylopodium none; calyx-teeth minute or none; dorsal ribs of the carpels fili- 
orm. 
K. Leaves ternate to dissected; leaflets narrow or small. 
LoMATIUM (p. 286) 
KK. Leaves 1—2-compound; leaflets wide, sharply toothed. 
EURYPTERA (p. 289) 
JJ. Stylopodium evident but flat: calyx-teeth evident; dorsal ribs of the carpels 
sharp or winged. CYNOMARATHRUM (p. 289) 
II. Lateral wings of the fruit thick. 
L. Dorsal ribs of the carpels very prominent or slightly winged. 
PSEUDOCYMOPTERUS (p. 285) 

LL. Dorsal ribs of the carpels filiform. 
M. Plant dwarf; leaves small, lobed or pinnate. CyMOPTERUS (p. 284) 
MM. Plant tall, stout: leaves large, pinnately decompound. 
LEPTOTAENIA (p. 285) 
GROUP 3 
A. Leaves simple. 
B. Leaves kidney-shaped, 3—-7-lobed and somewhat crenate. 
HYDROCOTYLE (p. 274) 
BB. Leaves linear to oblong, entire. 
C. Leaves awl-shaped, hollow, with cross-partitions: flowers white; umbel simple. 
LILAEOPsIS (p. 280) 
CC. Leaves linear to lanceolate, not hollow, without cross-partitions; flowers yel- 
low; umbel compound. BUPLEURUM (p. 277) 
AA. Leaves compound or very nearly so. 
D. Oil-tubes none; carpels smooth, linear, 
E. Fruit acutely ribbed. WASHINGTONIA (p. 276) 
EE. Fruit not ribbed except at the beak. ANTHRICUS (p. 276) 
DD. Oil-tube | at the base of each groove. 
F. Flowers white or rose-color. 
G.  Stylopodium conic. 
H. At least the upper leaflets linear or filiform. 
i I. Involucre none; leaflets flabelliform or the upper leaves merely cleft. 
CORIANDRUM (p. 276) 
II. Involucre present; leaflets dissected into filiform divisions. 
CARUM (p. 279) 



HH. Leaflets wider than linear. 
J. Involucre-bracts few or none. CICUTA (p. 278) 
JJ. Involucre-bracts conspicuous. TAENIOPLEURUM (p. 278) 
GG. _ Stylopodium flat or none. 
K. At least the lateral ribs thick and corky. 
L. Plants in water or very wet places; dorsal ribs of the carpels filiform. 
OENANTHE (p. 280) 
LL. Plants of rather dry soil; dorsal ribs of the carpels prominent and 
corky. 
x M. ” Ribs of the carpels much wrinkled when old; involucre none; fruit 
a4 3 mm. long. RHYSOPTERUS (p. 284) 
yi MM. Ribs of the carpels not wrinkled; involucre present; fruit not over 
2 mm. long. AmMI (p. 278) 
KK. Ribs obscure or none. LEIBERGIA (p. 279) 
FF. Flowers yellow; stylopodium flat or none. 

