256 UMBELLIFERA, PEUCEDANUM, 
what concave. On open places, Brit. Columbia to California, west of the 
Cascade Mountains. 
* * Wings of the fruit narrow and thickish oil-tubes obsolete or 
very indistinct and numerous in the intervals: doisa]l and intermedi- 
ate ribs obsolete or nearly so. 
_P. bicolor Watson Bot King, 129. Caulescentor scarcely so, 4-18 inches 
high, glabrous or slightly puberulent: petioles wholly dilated; leaves ter- 
nate-pinnately decompound, the ultimate segments very numerous and 
linear: umbel very unequally 2-12-rayed, with involucels of 1-8 linear- 
subulate bractlets; rays 1-5 inches long; pedicels short; fruit oblong 
Bia PROUe 5-6 lines long, 1-244 lines broad. Eastern Oregon to Nevada 
an tah, 
§ VI. Mostly tall and often stout, from long fleshy roots: leaves 
with usually broad or elongated segments: bractlets of the involucel 
small or none. tek 
* Leaves with narrowly linear more or less elongated leaflets. 
7 + Low: flowers white. 
P. Cusickii Watson Proc. Am. Acad. xxi, 453. Caulescent, 2-5 inches 
uhigh. from a thick elongated root: leaves 1-2-ternate, the segments with 
3-5 linear acute lobes, 3-12 lines long: umbe! with 1-3 short fertile rays 
and involucels of narrow acuminate bractlets which are distinct or more 
or less united pedicels very short: fiuit cbleng-elliytical, 4-5 lines Jong 
‘the thin wings as broad as the body or narrower: oil-tubes 1-3 in the in- 
tervals, 4 or 6 on the commissure: seed-face voncave. On the highest 
‘summits of Eagle Creek Mountains, Union county, Oregon. 
+ + Taller: flowers yellow. 
P. simplex Nutt. Watson Bot. King. 129. Caulescent, 6-18 inches 
thigh, puberulent: leaves ternate or biternate; leaflets from almost filiform 
‘to linear-lanceolate, 2-4 inches long: umbel unequally 3-15-rayed, with 
involucels of lanceolate or setaceous bractlets; rays 44-3 inches long: ped- 
icels 1-3 lines long: fruit broadly oblong to nearly orbicular, sometimes 
emarginate at each end, 3-6 lines long, 2-5 lines broad, with wings broader 
than the body and prominent dorsal and intermediate ribs: oil-tubes large 
-and solitary in the intervals, 2 on the commissure: seed-face slightly con- 
cave. Eastern Washington to California, Idaho and Montana. 
P. triternatum Nutt. T. & G. Fl. i, 626. Caulescent 1-3 feet high, 
from a deep-seated elongated fusiform root: leaves biternate or triternate: 
leaflets from narrowly linear to linear-lanceolate, 2-4 inches long: umbel 
unequally 5-18-rayed, with involucels of lanceolate or setaceous bractlets; 
rays 144-3 inches long; pedicels a line or more long: fruit narrowly oblong, 
-glabrous 3-6 lines long 114-2 lines broad with narrow wings, and some- 
what prominent dorsal and intermediate ribs: oil-tubes very large and 
broad, solitary in the intervals, 2on the commissure. Brit Columbia to 
California, very variable. % . 
Var. macrocarpum C. & R. Rev. Umb. 70. A more robust for 
-with broader leaflets, longer rays and fruit 6-8 lines long. About Hood 
_ River, Oregon. 
Var. brevifolium C.&R.1.c. Stout 6-18 inches high, rough-puber- 
ulent with more compact leaves, stout inflated petioles, and shorter and 
broader often toothed leaflets. On the high hills opposite The Dalles. 
Var. alatum C. & R.1.c. Leaves with very narrowly linear and 
elongated segments fruit 5-6 lines long with broader wings. Eastern 
Oregon to California. 
