254 UM BELLIFERA. PEUCEDANUM. 
eanally 6-8-rayed, with involucels of conspicuous and somewhat folia- 
ceous lanceolate or linear gamophyllus bractlets: rays 1-8 inches long: 
pedicels 2-5 lines long, calyx-lobes evident: fruit narrowly oblong, glabrous 
4-12 lines long 2-3 lines broad, with wings about half as wide as the body, 
and filiform dorsal and intermediate ribs: oil-tubes solitary in the inter- 
vals, 2 or 4 on the commissure: seed face with a slight central longitudi- 
nal ridge. On dry rocky ridges and plains Brit. Columbia to California. 
P. macrocarpum Nutt. 1.c.627. Caulescent, branching a foot or two . 
high, more or less pubescent: leaves ternate-pinnately decompound, with 
small linear cuspidate segments; umbel 3-12-rayed with involucels of 
lanceolate acuminate often united bractlets rays’ from %-4 inches long: 
fruit broadly elliptical glabrous 5-9 lines long: 3-4 lines broad with wings 
- as broad as the body, on pedicels 1-5 lines long: oil-tubes large,solitary in the 
intervals, 2 on the commissure. Brit. Columbia to California. 
§ III. Low and rather slender, from elongated comparatively slen- 
der roots leaves rather small, more or less pinnately compound. With 
short segments fruit-wings never broader than the body: oil-tubes 3-6- ~ 
in the intervals. 
% Flowers white, fruit-wings more than half as wide as the body. 
P. Nevadense Watson Proc. Am. Acad. xi, 143. Glaucous-puberulent, 
shortly caulescent peduncle 3-15 inches high: leaves pinnately decom- 
pound with small segments: umbel equally 5-10-rayed, with involucels of 
scarious-margined linear lanceolate bractlets: rays often 1-2 inches long; 
edicels 2-8 lines long: fruit rounded to ovate, somewhat pubescent, 3-3 
ines long, 2-4 lines broad, with wingsalmost as broad as the body and eyvi- 
dent dorsal and intermediate ribs: oil-tubes 3 or 4 in the intervals, 4 or 6 
on the commissure. From Northern Cal. toS. E Oregon, Utah and Ne- 
vada. 
* * Flowers yellow, fruit wings narrower. 
P. Oreganum C. & R. Rev. Umb. 64. Acaulescent and cespitose 
from a multicipital caudex, with very slender peduncles 1-2 inches high 
bearing a very small single umbel or sometimes two nearly sessile umbellets 
and one to few matured puberulent fruits about 2 lines long ultimate leaf 
segments very small, linear-oblong not cuspidate. Alpine rocks Blue and 
Eagle Creek Mountains, Oregon. (Cusick ) 
P. villosum Nutt. Watson Bot. King 131. Acaulescent more or less 
densely pubescent 3-8 inches high: leaves finely dissected, with yery nu- 
merous narrow crowded segments: umbel somewhat equally 4-5 rayed, 
with involucels of ovate to linear usually very tomentose braetlets; rays 
about an inch long; pedicels 1-3 lines long: fruit oval, somewhat pubes- 
cent with wings half as broad as the body, and prominent dorsal and in- 
termediate ribs: oil-tubes 3 or 4 in the intervals 4 om the commissure, 
seed-face plane. Northeen California and Nevada to the Yukon river. 
P. Donnellii C. & R. Bot. Gaz., xiii, 148: Shortly caulescent or 
acaulescent 6-12 inches high, glabrous from a fusiform root; leaves ter- 
nate then pinnately decompound leaves with segments cleft into short 
oblong or linear lobes: umbel somewhat unequally 6-12-rayed, with im- 
volucels of linear acuminate bractlets: rays 1-4 inches long; pedicels 2-8 
lines long: fruit ovate to broadly oblong, glabrous, 3-4 lines long, 2-3 
lines broad, with wings less than half as broad as the body and promi- 
nent dorsal and intermediate ribs: oil-tubes small, 4-6 in the intervals, 
4-6 on the commissure. In wet places, John Day Valley, Oregon. 
P. Sandbergii C:&R.1l.c. 79. Caulescent, branching at base, an 
inch or two to a foot high, from an elongated comparatively slender root 
