PEUCEDANUM. - ©: UMBELLIFER2. 257 
P. levigatum Nutt 1. c. 627. Caulescent or acaulescent, 6-15 inches 
high, glabrous; from shallow seated long roots: leaves triternate; leaflets. 
linear 3-12 lines-long by half a line wide: umbel unequally 10-14-rayed, 
with involucels obsolete or rarely 1-3 small triangular bractlets: pedicels 
4-5 lines long: fruit 4-5 lines long 114-2 lines broad, with narrow wings 
and prominent dorsal and intermediate ribs: oil-tubes 2 on the commis- 
sure: seed-face wore or less concave with central longitudinal ridge. On 
bluffs of the Columbia River, near Celilo. 
* * Leaves with lanceolate or orbicular segments. 
P. leiocarpum Nutt l.c 626. Acaulescent, glabrous, 1-2 feet high, 
from a very long fleshy root: leaves biternate or triternate or ternate- 
quinate, sometimes simply ternate; leaflets thickish, from ovate to nar- 
rowly lanceolate 1-2 inches long. petiolulate, entire, or toothed at the. 
apex: umbel very unequally 6-15-rayed without involucels; peduncles 
and rays dilated at summit: rays 1-8 inches long: pedicels variable 1-9 
lines long : flowers yellow: fruit narrowly oblong 5-7 lines long 144-2 lines 
broad narrowly winged: oil-tubes large and solitary in the intervals, 4 on 
the commissure: 8eed-face somewhat concave. Brit. Columbia to Cali- 
fornia and Idaho. 
P. Nuttallii Watson Bot. King. 128. Acaulescent, glabrous, 6-12 
inches high: leaves once or twice ternate with ovate’to orbicular leaflets 
with cuneate or cordate base; fruit ovate to oblong, 4 lines long, 3 lines 
broad, very narrowly winged: oil-tubes small, 3 in the intervals, 4 or 6 on 
the commissure: seed-face almost plane. Eastern Oregon to N. Nevada 
and Idaho. ‘ 
P. Brandegei C. & R. Bot. Gaz. xiii, 210. Short caulescent, glab- 
rous, 6-12 inches high from a thick elongated root; leaves _ter- 
nately decompound the ultimate segments lanceolate, 6-12 lines 
long, cuspidate : umbel 6-12-rayed, with involucels of few linear or seta- 
ceous bractlets: rays 3-6 lines long; pedicels not more than a line long, 
both reflexed at maturity: flowers yellow: calyx-teeth evident: fruit (im- 
mature) oblong, about 4 lines long, 2 lines broad, with wings about half 
as broad as the body, and prominent dorsal and intermediate ribs: oil- 
tubes 2-4 in the intervals 4 or 60n the commissure, Near Walla Walla, 
Washington. (Brandegee.) 
* * * Very stout and tall with large decompound leaves and linear 
oblong segments. “ 
P. Suksdorfii Watson Proc. Am. Acad. xx, 369. Caulescent, 2-4 feet 
high: leaf-segments 1-2 inches long, entire or 2-3-cleft at the top: umbel 
somewhat equally 6-12-rayed with involucels of linear acuminate bractlets; 
rays 1-5 inches long; pedicels 3-9 lines long: flowers yellow: fruit nar- 
rowly oblong, 9-14 lines long 3-6 lines wide with wings narrower than the 
body, and very prominent dorsal and intermediate ribs: oil-tubes solitary 
in the intervals, very large, 2 onthe commissure: seed-face somewhat 
concave. Dry rocky mountain sides, Klickitat county, Washington. 
§ VII. Low shortly caulescent or acaulescent, from a thick elong- 
ated root, glabrous: leaves ternate or pinnate with broad oblong or 
round coarsely cuspidate-toothed leaflets, flowers yellow: fruit-wings 
very broad, often several times broader than the body: oil-tubes 3-4 
or solitary in the intervals. 
-P. Howellii Watson 1. c. Short caulescent, peduncles 12-15 inches 
high: leaves biternate to biquinate: leaflets cuneate-orbicular to round- 
cordate, acutely dentate, often 3-lobed, 6-12 lines long: umbel with elong- 
ated and divaricate fertile rays with involucels of acuminate lanceolate 
