PEUCEDANUM, UMBELLIFERA, OBB 
rough pubescent petioles wholly inflated, with @ very conspicuous white 
scarious margin; leaves ternately or pinnately dissected, the ultimate seg- 
ments very short, linear: umbel very unequally 6-15-rayed, with involu- 
cels of distinct linear-lanceolate bractlets; rays 1-4 inches long; pedicels a 
line or two long; flowers bright yellow: fruit ovate puberulent 2-244 lines 
long with very narrow wings, and filiform dorsal and intermediate ribs 
oil-tubes 4-5 in the intervals 6 on the commissure: seed-face plane. Bare 
mountain tops, Northern Idaho and Montana to Brit. Columbia. 
P. microcarpum Howell P. C, Pl. Coll. 1887. Caulescent, branching 
from the base 6-16 inches high, glabrous: leaves pinnately-decompound 
the ultimate seginents oblong- to linear-lanceolate: minutely cuspidate: 
umbel somewhat equally 1u-18-rayed with involucels of several linear- 
lanceolate bractlets 1-3 lines long: pedicels 2 lines long, flowers dark - 
yellow : fruit oblong 3 lines long 2 lines broad with narrow wings: oil-tubes 
4on the commissure. On dry cliffs, Umpqua Valley. 
§.IV. Shortly caulescent, slender from elongated comparatively 
slender roots; glabrous; leaves small, lanceolate or oblong in outline, 
pinnate or bipinnate with ovate toothed segments. 
* Fruit wings half as broad as the body. 
P. Hallii Watson Proc. Am. Acad. xi, 141. Peduncles elongated 6-15 
inches high: leaves pinnate oblong in outline, the ovate segments 44-inch 
long, deeply toothed or pinnatifid: umbel equally 3-6-rayed, with small 
involucels; rays about an inch long; pedicels 3-+ lines long: flowers yel- 
low: fruit broadly elliptical 3 lines long, 2 lines broad with filiform dorsal 
and intermediate ribs, oil-tubes 3 in the intervals 4-6 on the commissure. 
Northern Uregon and Washington. 
* * “Fruit wings much broader than the body. 
P. Martindalei C. & R. Bot. Gaz. xiii, 142. Caulescent and branching, 
with elongated peduncles 4-12 inches high: leaves pinnate, or bipinnate 
with toothed or pinnatifid segment: fruit 4-7 lines long, 3-4 lines broad, 
with wings as broad or broader than the body, and prominent dorsal and 
intermediate ribs; oil-tubes solitary in the intervals, 20n the commissure, — 
seed-face somewhat concave with central longitudinal ridge. On bluffs of 
the Columbia river, near the Cascades. 
Var. angustatum C. & R. 1. c. 143. Usually more caulescent and 
sometimes taller with more dissected leaves, and wings of the fruit but 
half a line wide making a fruit 2 lines wide. On high mountains, Brit. 
Columbia to California. 
§ V. Caulescent; from elongated comparatively slender roots: leaves 
decompound with narrow linear more or less elongated segments and 
usually wholly dilated petioles: bractlets of the involucels scarious- 
margined more or less conspicuous. 
* Wings of the fruit nearly as broad as the body, thin: oil-tubes 
large and solitary in the intervals: dorsal and intermediate ribs 
prominent. 
P. utriculatum Nutt. T. & G. Fl. i, 628. Caulescent to nearly acaul- 
escent, 4-12 inches high from a more or less tuberous root, puberulent or 
glabrous: petioles very broadly dilated; leaves ternately or pinnately de- 
compound, with ultimate segments narrowly linear, 6 lines long or less: 
umbel unequally 5-20-rayed with involucels of much dilated mostly obo- 
vate often toothed petiolulate bractlets; rays about 2 inches long, pedicels 
2-5 lines long; flowers yellow; fruit broadly elliptical, glabrous, 2-5 lines 
long, 1-3 lines broad: oil-tubes 4-6 on the commissure: seed-face some- 
