58 
tubes small, 2 to 4 in the intervals, 4 to 6 on the commissural siJe: 
seed-face plane. (Fig. 42.) 
From N. California to Washington Territory and Idaho. FI. March and 
April. 
This species is very much confused in collections, for in the absence 
of good fruit it is hard to separate P. GeyeH and P. farinosum from Oro- 
genia. All are low spring-bloomers, mostly from deep-seated round 
tubers, white flowers, and a general Erigenia-like appearance. Collectors 
should not attempt to distinguish them y/ithout mature fruit or their dis- 
' tributions will lead to great confusion. This is “Tuhuha” of the Spokane 
Indians. 
* * Caulescent or acaulescent : flowers yellow: oil-hcbes 
solitary. 
( 
6. P. Cous Watson, Proc. Am. Acad. xxi. 453. Acaules- 
cent, sflabrous or slightly puberulent, with roughish scapes 2 to 6 
inches high, from a nearly globose tuber (6 to 12 lines in diameter): 
leaves pinnate; leaflets 3 to 7-parted or cleft or even entire; ulti- 
mate segments linear-oblong: umbels unequally 3 to 10-rayed, 
with involucels of short oblong-ovate scariously margined bractlets; 
rays from nearly wanting to 2 inches long; pedicels short: fruit 
oblong, more or less puberulent, 2^^ to 4 lines long, to 2 lines 
broad, with wings about half as broad as body, and prominent 
“ dorsal and intermediate ribs: oil-tubes large, filling the intervals, 
4 to 6 on the commissural side: seed-face with central longitudinal 
ridge. (Fig. 43.) 
Stony hillsides, E. Oregon, John Day’s Valley, May 26, 1880 {Hoioell 
270), and Antelope, in 1885 {Howell 418). Cusick 358, referred by Watson 
to P. Cous. is P. circumdatmn. 
This species is called “Cous” by the Indians, and the starchy tubers 
are used by them for food. 
7. P, ambiguum Nutt. Torr. & Gray, FI. i. 626. Glabrous, 
from low acaulescent to a foot high and caulescent, with tuberous 
usually moniliform roots: petioles much dilated at base; leaves 1 
to 2-pinnate, with more or less elongated linear leaflets, the upper 
often more dissected: umbel unequally 8 to 18-rayed, with mostly 
no involucels; rays 1 to 3^ inches long; pedicels 2 to 3 lines long: 
fruit narrowly oblong, glabrous, 3 to 4 lines long, a line broad, 
very narrowly winged : oil-tubes 2 (broad and thin) on the com- 
missural side. (Fig. 44.) ^ 
Prom Oregon (Ciwc/; 1099, iTendersow 55), Washington Territory {Suks~ 
