252 UMBELLIFER 2. ‘PEUCEDANUM. 
mostly solitary in the intervals, or with accessory ones in some species. 
* Always acaulescent, mostly glabrous. ~ 
+ Flowers white. 
P. Hendersoni C. & R. Bot. Gaz. xiii, 210. Scapes 4-6 inches long, 
decumbent from a shallow constricted tuber 6-12 lines in diameter; leaves . 
ternate then bipinnate, ultimate segments short and obtuse: umbel equaliy 
2-5-rayed, with involucels of linear acuminate scarious bractlets; rays 6 
lines long; pedicels 1-2 lines long; fruit ovate very glabrous 2% lines long 
by 2 lines broad, with thickish narrow wings more or less involute and a 
rather prominent ridge on the commissural face: oil-tubes solitary in the 
intervals, 2 on the commissure: seed face plane. On high hill-tops, John 
Day Valley, Eastern Oregon. 
P. Canbyi C.&R.1 c¢ 78. Scapes erect, 3-8 inches high, with a 
short underground stem from a thick more or less elongated root which 
ends in a globose tuber 6-15 lines in diameter: leaves ternate pinnate or 
bipinnate, ultimate segments small with 3-5 linear-oblong lobes: umbel 
equally 5-10-rayed, with involucel of narrowly linear scarious-margined 
bractlets: rays 1-2 inches long: pedicels 4-6 lines long; fruit oblong-ovate, 
glabrous, 4 lines long, with wings about half as broad as the body: oil- 
tubes solitary in the intervals, 2or4 on the commissure. Hizh ridges, 
Eastern Oregon and Washington. 
P. Geyeri Watson Proc. Am. Acad. xiv, 298. . Low, glabrous; root 
moniliform with 2 or 3 small globose tubers: leaves ternate-quinate, with. 
linear leaflets 4-9 lines long: umbel small with unequal rays: involucel of 
several linear acuminate bractlets; mature fruit unknown. Collected by 
Geyer Spalding and Lyall, not since reported. 
P. farinosum Geyer Hook Lond. Journ. Bot. vi, 235. Somewhat 
caulescent: stems slender from a rather deep-seated small round tuber 
4-6 lines in diameter with numerous clusters of fine rootlets on its sur-. 
face: leaves 2-3-ternate, with segments more or less lobed, ultimate di- 
visions all linear: umbel 1-8 rayed, with involucels of few small linear 
bractlets: rays 1-2 inches Jong, fruit almost sessile, oblong-elliptical, 
glabrous, 3-4 lines long, 2 lines broad, with wings half as broad as the 
body : oil-tubes small, 2-4 in the intervals, 4-6 on the commissure: seed-. 
face plane. From Brit. Columbia to California and Idaho. 
P. Gormani P. Watsoni C. & R in Part. Stems 2-3 inches high 
from a shallow globular tuber an inch or less in diameter with fascicles cf 
rootlets on its surface: leaves bipinnate, the ultimate divisions oblong or 
linear, umbel unequally 1-5 rayed with involucels of a few setaceous 
bractlets or none: fruit sessile or nearly so; ovate, rough-puberulent 3 lines 
long with wing more than half as wide as the body and conspicuous dor- 
sal and intermediate ribs: oil-tubes one in each rib, 2-60n the commis- 
sure, seed-face plane. High hills opposite The Dalles. 
P. evittatum C.&R. Eight toeighteen inches high from a deep-seated 
small tuber, glabrous: leaves once or twice ternate then more or less 
pinnate into linear, callous-tipped segments 6-12 lines long: umbel some- 
what unequal] 8-18-rayed with involucels of numerous purplish lanceolate 
acuminate gamophyllus bractlets; rays 1-2 inches long, pedicels short: 
fruit oblong glabrous 4-6 lines long 244 lines broad, with very thin win 
more than half as broad as the body: oil-tubes none. Ellensburg, Wash- 
ington. (G. R. Vasey, 1889 ). 
+ + Flowers yellow. 
P. Watsoni C. & R. Bot. Gaz. xiii, 299in Part. Low, 2-3 inches 
