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. Fl. March and 

 April. 



This species is very much confused in collections, for in the absence 

 of good fruit it is hard to separate P. (ieijeri and P. farinomim from Oro- 

 (jenia. 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 without mature fruit or their dis- 

 tributions will lead to great confusion. This is "Tuhuha" of the Spokane 

 Indians. 



* * Caulescent or acaidescent : Jioivcrs yellow: oil-tubes 

 solitary. 



6. P. COUS Watson, Proc. Am. Acad. xxi. 458. Acaules- 

 cent, glabrous 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 8 to 7-parted or cleft or even entire; ulti- 

 m.'ite segments linear-oblong: umbels unequally 8 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, Ij^ to 2 lines 

 broad, with wings about half as broad as body, and prominent 

 dorsal and intermediate ribs: oil-lubes large, filling the intervals, 

 4 to 6 on the commissural side: seed-face with central longitudinal 

 ridge. (Fig. 48.) 



Stony hillsides, E. Oregon, John Day's Valley, May 26, 1X80 {HoweU 

 270), and Antelope, in iS85 {Howell 418). Cn»ick 358, referred by Watson 

 to P. Couti, is P. circumdatuin. 



This species is called "Cous" by the Indians, and the starchy tubers 

 are used by them for food. 



7. P. ambiguum Nutt. Torr. & Gray, Fl. i. iVl^. Glabrous, 

 from low acaulescent to a foot high and caulescent, w^th 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 unec|ually 8 to 18-rayed, with mostly 

 no involucels; rays 1 \.o '6% inches long; pedicels 2 to 8 lines long: 

 fruit narrowly oblong, glabrous, 8 to 4 lines long, a line broad, 

 very narrowly winged: oil-tubes 2 (broad and thin) on the com- 

 missural side. (Fig. 44.) 



From Oregon iCusiel; 1090, Henderfton .5.')), Washington Territory (Siikf<- 



