21. P. Donnellii C. & R. Bot. Gazette, xiii. 148. Shortly 
caulescent or acaulescent, 6 to 12 inches high, glabrous, from a 
fusiform root: leaves ternate then pinnately decompound, v^ith 
segments pinnately cleft into short oblong or linear lobes: umbel 
somewhat unequally f) to 12-rayed, with involr.cels of linear 
acuminate bractlets; rays 1 to 4 inches long; pedicels 2 to 8 lines 
long: fruit ovate to broadly oblong, glabrous, 8^ to 4 lines long, 
2 to 8 lines broad, with wings less than half as broad as body, and 
prominent dorsal and intermediate ribs; oil-tubes small, 4 to 6 in the 
intervals, 4 to 6 on the commissural side. (Fig, 55.) 
Oregon, Union county (Cusick 3(5, in 1883), John Day Valley (Hoivell 
420 and 829, in 1885). FI. April. 
Most nearly resembling P. Nevadenne. Dedicated to John Donnell 
Smith, in whose herbarium the species was first detected. 
22. P. Sandbergii C. & R. Bot. Gazette, xiii. 79, Caules- 
cent, branching at base, an inch or two to a foot high, from an 
elongated comparatively slender root, rough puberulent: petioles 
wholly inflated, with a very conspicuous white scarious margin; 
leaves ternately or pinnately dissected, the ultimate segments very 
short linear: umbel very unecpially 6 to 15-ray ed, with involucels 
of distinct linear-lanceolate bractlets; rays 1 to 4 inches long; 
pedicels a line or tv/o long; flowers bright yellow: fruit ovate, 
puberulent, 2 to lines long, lines broad, with very narrow 
wings, and filiform dorsal and intermediate ribs: oil-tubes 4 or 5 in 
the intervals, 6 on the commissural side: seed-face plane. (Fig. 56.) 
Bare mountain tops, 5,000 feet altitude, along snow drifts, Kootenai 
county, N. Idaho (J. PT. Sandberg 47); Upper Marias Pass, 7,300 feet 
altitude, N. Montana (Canby 1501; North and South Kootenai Pass {Daw- 
son 876) and top of Crow’s Nest Pass {Dawson 92), B. C. 
This very distinct alpine species is remarkable for its inflated petioles, 
with very broad glistening scarious margins, which form the most con- 
spicuous feature of the plant. The peduncles are short when the plant first 
blooms, rising but a few inches above the ground, but they rapidly elong- 
ate, becoming as much as a foot high. The fertile rays also are often 
very much elongated, becoming many times longer than the sterile rays. 
28. P. microcarpum Howell in herb. Closely resembling 
the preceding species, but differing in its stouter habit, petioles 
without conspicuous margins, somewhat equally-rayed umbels, 
deeper yellow flowers, glabrous fruit which is oblong and 3 lines 
long, and much earlier blooming. 
