Umbellaceae 287 
: J. Ojil-tube 1 in each interval. 
: K. Fruit glabrous; leaves ternate and then I—2-pinnate. E. 
: L. circumdatum ©. & R. 
KK. Fruit somewhat puberulent: leaves pinnate. E. 
L. cous C. & R. (Cous Biscuit-root) 
JJ. Oil-tubes several in each interval. 
L. Fruit puberulent; involucel-bracts united nearly to the top. E. 
L. watsoni ©. & R. 
LL. Fruit glabrous; involucel-bracts distinct. EF. 
: L. montanum ©. & R. 
AA. Plants arising from somewhat thickened roots but hardly tubers, mostly stout, 
often tall; leaves various. 
M. Peduncles usually slender, never swollen at the top. 
N.  Involucel-bracts conspicuous, often wide or united at base. 
O. Flowers white. 
P. _ Fruit glabrous; oil-tube O—1 in each interval. 
Q. Involucel-bracts not scarious-margined, often united; umbel tays 2-10) 
cm. long; fruit 6—24 mm. long, 3—7 mm. wide. W. E. (P. eurv- 
carpum; L. macrocarpum semivattatum; L. artemistarum. ) 
L. macrocarpum ©. & R. 
QQ. _ Involucel-bracts scarious-margined, not united: umbel-rays |]—3.5 
cm. long; fruit 5 mm. long, 4 mm. wide. E. 
L. orientale ©. & R. 
PP. Fruit pubescent; oil-tubes 3—4 in each interval. E. 
L. nevadense ©. & R. 
OO. Flowers yellow. 
R. Ultimate leaf-segments narrowly linear; involucel-bracts obovate; oil-tube 
1 in each interval. W. 
L. utriculatum ©. & R. 
RR. Ultimate leaf-segments short, obtuse; involucel-bracts linear; oil-tubes 
2—3 in each interval. E. 
L. vaginatum ©. & R. 
NN.  Involucel-bracts none or small. 
S. Fruit from narrowly to widely oblong. ° 
T. Leaves narrow in outline, usually pinnate. 
U. Fruit puberulent. E. 
L. oreganum ©. & R. 
UU. Fruit glabrous. 
V.  Oil-tubes more than 3 in each interval. C. 
L. hallii C. & R. 
VV.  Oil-tube | in each interval. 
W. Flowers deep yellow; leaf-segments minute; fruit 5 mm. long. E. 
L. leibergi C- & R. 
WW. Flowers pale yellow; leaf-segments larger; fruit 8—16 mm. 
long, W.C. E. (ZL. martindalei angustatum.) 
L. martindalei C- & R. 
TT. Leaves wide in outline, with at least the primary divisions ternate. 
X. Leaves rather simply 1—3-ternate. 
Y. Wings wide. 
Z. Oil-tube only | in each interval; flowers yellow. 
