)i) 



Jn/-/:!lii). l.lalio iWilro.,), V.'lh.w.stoiio Falls i /'<//•;// llDi. Hrid Muiitaiia 

 ( Watiiou, Cnnbji l.M). northward into British Cohinibia. Fl. Muv to July. 



This species is oxtreinely variable in foliage, and hence hard to define 

 clearly in this regard. (Collectors seem to have conlused it with /*. Infer- 

 nahim, but its tuberous roots and glabrous character, as well as its much 

 narrower fruit-wings, should serve as distinguishing characters. 

 P. UrrifiKliDit has also been mistaken for P. umliigti inn, but its broader 

 fruit-wings and. much reduced leaflets should easily separate tiiem. 



Viw. leptocarpum. Fruit sessile or nearly so, making a 

 close somewhat divaricate cluster: rays few and \ery unequal.— 

 P. tritcrtiatitm^ var, leptocarpum Torr. & Gray, Fl. i, ()2f). 



Oregon {Xiittull, (lei/er i>'u. Howell U', CuHick l^-'iH). 



8. P. circumdatum Watson, Proc. Am. Acad. xxii. 474. 

 Stems solitary from a deep-seated constricted tuber, glabrous or 

 puberulent, foot or less high: leaves ternate-quinate, the segments 

 once or twice pinnatisect, lobes linear, 1 to M or 4 lines long: umbel 

 unequally 6 to 12-rayed, with involucels of conspicuous broadly 

 oblanceolate (often united ) bracllets, becoming scarious; rays J^ to 

 8^ inches long; pedicels very short: fruit oblong-elliptical, gla- 

 brous, 3 or 4 lines long, 1 J^ lines broad, with narrow wings, and 

 very prominent dorsal and intermediate ribs: oil-tubes 4 on the 

 commissural side: seed-face concave, with a prominent central 

 ridge. (Fig. 45.) 



Abundant on hillsides in Ordgon, the Dalles iXeviun), John Day Val- 

 ley (Hoirf//), Wallowa region (Cuftick), Blue Mountains (HenderHon); Mon- 

 tana, near Bozeman (.SVnfeHer 66a). Little Belt Mts. («Scr/6ner 66), Belt 

 River Canon ( Wi}ltam>i 149). Bozeraan Pass and Little Blacltfoot Kiver 

 iCanhi/ 152); Yellowstone Park (Tirerdji 854); N. \V. Wyoming {Parry 120,i; 

 Dakota (3//.'<.s Elaine JiKfler), Jjitile Missouri iCniihi/ 152 a). Fl. May to 

 August. 



J^ 2. Stout, glabrous only in P. Graiji. from largo roots (in P. macro- 

 carpum and F. eurycarpum ending in an oblong sometimes large tuber): 

 leaves mostly large and very finely dissected, ihe ultimate segments fili- 

 form or narrowly linear: fruit wings broader (from half as broad as body to 

 somewhat broader than body): oil-tubes 1 to 3 in the intervals (solitary in 

 two species). 



* Floxccrs ycHoi.L' : fruit glabrous : acaulcscoit plants. 



y. p. foeniculaceum Nutt. Torr. «& Gray, Fl. i. 627. Tomen- 

 tose or glabrous, v> ith peduncles 8 to 12 inches long: leaves finely 

 dissected, ternate-piiinate, with short filiform segments: umbel 

 rather equally 8 to 12-rayed, with gamophyllous involucels, 5 to 

 7-cleft and with conspicuouslv haiiv margins; rays 1 to 2j,2 inches 



