254 XJiVlBELLlFER^E'. ^eucedasux*. 



equally 6-8-rayed, with involucels of conspicuous and somewhat folia- 

 ceous lanceolate or linear gamophyllus bractlets : rays 1-3 inches long : 

 pedicels 2-5 lines long, calyx-lobes evident: fruit narrowly oblong, glabrous 

 4-12 lines long 2-3 lines broad, with wings about half as wide asthe body, 

 and filiform dorsal and intermediate ribs : oil-tubes solitary in the inter- 

 vals, 2 or 4 on the commissure : seed face with a slight central longitudi- 

 nal ridge. On dry rocky ridges and plains Brit. Columbia to California. 



P. macrocarpum Nutt. 1. c. 627. Caulescent, branching a foot or two 

 high, more or less pubescent: leaves ternate-pinnately decompound, with 

 small linear cuspidate segments; umbel 3-12-rayed with involucels of 

 lanceolate acuminate often united bractlets rays from 3^-4 inches long : 

 fruit broadly elliptical glabrous 5-9 lines long: 3-4 lines broad with wings 

 as broad as the body, on pedicels 1-5 lines long : oil-tubes large, solitary in the 

 intervals, 2 on the commissure. Brit. Columbia to California. 



§ III. Low and rather slender, from elongated comparatively slen- 

 der roots leaves rather small, more or less pinnately compound. With 

 short segments fruit-wings never broader than the body : oil-tubes 3-6 

 in the intervals. 



* Flowers white, fruit-wings more than half as wide as the body. 



P. Nevadense Watson Proc. Am. Acad, xi, 143. Glaucous- puberulent, 

 shortly caulescent peduncle 3-15 inches high: leaves pinnately decom- 

 pound with small segments : umbel equally 5-10-rayed, with involucels of 

 scarious-margined linear lanceolate bractlets : rays often 1-2 inches long ; 

 pedicels 2-5 lines long: fruit rounded to ovate, somewhat pubescent, 3-5 

 lines long, 2-4 lines broad, wifh wings almost as broad as the body and evi- 

 dent dorsal and intermediate ribs : oil-tubes 3 or 4 in the intervals, 4 or 6 

 on the commissure. From Northern Cal. to S. E Oregon, Utah and Ne- 

 vada. 



* * Flowers yellow, fruit wings narrower. 



P. Oreganum C. & R. Rev. Umb. 64. Acaulescent and cespitose 

 from a multicipital caudex, with very slender peduncles 1-2 inches high 

 bearing a very small single umbel or sometimes two nearly sessile umbellets 

 and one to few matured puberulent fruits about 2 lines long ultimate leaf 

 segments very small, linear-oblong not cuspidate. Alpine rocks Blue and 

 Eagle Creek Mountains, Oregon. (Cusick ) 



P. villosum Nutt. Watson Bot. King 131. Acaulescent more or less 

 densely pubescent 3-8 inches high : leaves finely dissected, with very nu- 

 merous narrow crowded segments : umbel somewhat equally 4-5 rayed, 

 with involucels of ovate to linear usually very tomentose bractlets ; rays 

 about an inch long; pedicels 1-3 lines long: fruit oval, somewhat pubes- 

 cent with wings half as broad as the body, and prominent dorsal and in- 

 termediate ribs : oil-tubes 3 or 4 in the intervals 4 on the commissure, 

 seed-face plane. Northern California and Nevada to the Yukon river. 



P. Donnellii C. & R. Bot. Gaz., xiii, 143. Shortly caulescent or 

 acaulescent 6-12 inches high, glabrous from a fusiform root; leaves ter- 

 nate then pinnately decompound leaves with segments cleft into short 

 oblong or linear lobes : umbel somewhat unequally 6-12-rayed, with in- 

 volucels of linear acuminate bractlets : rays 1-4 inches long ; pedicels 2-8 

 lines long: fruit ovate to broadly oblong, glabrous, 3-4 lines long, 2-3 

 lines broad, with wings less than half as broad as the body and promi- 

 nent dorsal and intermediate ribs : oil-tubes small, 4-6 in the intervals, 

 4-6 on the commissure. In wet places, John Day Valley, Oregon. 



P. Sandbergii C*&R. 1. c. 79. Caulescent, branching at base, an 

 inch or two to a foot high, from an elongated comparatively slender root 



