256 UMBELLIFER^E. PECCEDANUM. 



what concave. On open places, Brit. .Columbia to California, west of the 

 Cascade Mountains. 



* * Wings of the fruit narrow and thickish oil-tubes obsolete or 

 very indistinct and numerous in the intervals: doisal and intermedi- 

 ate ribs obsolete or nearly so. 



P. bieolor Watson But King, 129. Caulescent or scarcely so, 4-18 inches 

 .high, glabrous or slightly puberulent : petioles wholly dilated; leaves ter- 

 nate-pinnately decompound, the ultimate segments very numerous and 

 linear: umbel very unequally 2-12-rayed, with involucels of 1-8 linear- 

 subulate bractlets ; rays 1-5 inches long; pedicels short; fruit oblong 

 .glabrous, 5-6 lines long, 1-2% lines broad. Eastern Oregon to Nevada 

 '.and Utah. 



VI. Mostly tall and often stout, from long fleshy roots : leaves 

 with usually broad or elongated segments : bractlets of the involucel 

 small or none. 



* Leaves with narrowly linear more or less elongated leaflets. 

 -*- Low : flowers white 



P. Cusickii Watson Proc. Am. Acad. xxi, 453. Caulescent, 2-5 inches 

 high, from a thick elongated root : leaves 1-2-ternate, the segments with 

 3-5 linear acute lobes, 3-12 lines long: umbel with 1-3 short fertile rays 

 and involucels of narrow acuminate bractlets which are distinct or more 

 or less united pedicels very thort : fiuit o.bloiig-ellij.tical, 4-5 lines long 

 the thin wings as broad as the body or narrower : oil-tubes 1-3 in the in- 

 tervals, 4 or 6 on the commissure: seed-face concave. On the highest 

 summits of Eagle Creek Mountains, Union county, Oregon. 



-*- H- Taller: flowers yellow. 



P. simplex Nutt. Watson Bot King. 129. Caulescent, 6-18 inches 

 high, puberulent: leaves ternate or biternate; leaflets from almost filiform 

 to linear-lanceolate, 2-4 inches long: umbel unequally 3-15-rayed, with 

 involucels of lanceolate or setaceous bractlets; rays /^-3 inches long: ped- 

 icels 1-3 lines long : fruit broadly oblong to nearly orbicular, sometimes 

 emarginate at each end, 3-6 lines long, 2-5 lines broad, with wings broader 

 than the body and prominent dorsal and intermediate ribs : oil- tubes large 

 and solitary in the intervals, 2 on the commissure : seed-face slightly coh- 

 ave. Eastern Washington to California, Idaho and Montana. 



P. triternatnm Nutt. T. & G. Fl. i, 626. Caulescent 1-3 feet high, 

 from a deep-seated elongated fusiform root : leaves biternate or triternate : 

 leaflets from narrowly linear to linear-lanceolate, 2-4 inches long : umbel 

 unequally 5-18-rayed, with involucels of lanceolate or setaceous bractlets; 

 rays %-3 inches long; pedicels a line or more long : fruit narrowly oblong, 

 glabrous 3-6 lines long 1/4-2 lines broad with narrow wings, and some- 

 what prominent dorsal and intermediate ribs : oil-tubes very large and 

 broad, solitary in the intervals, 2 on the commissure. Brit Columbia to 

 California, very variable. 



Var. macrocarpnm C. & R. Rev. Umb, 70 A more robust form 

 with broader leaflets, longer rays and fruit 6-8 lines long. About Hood 

 River, Oregon. 



Var. brevifolium C. & R. 1. c. Stout 6-18 inches high, rough-puber- 

 ulent with more compact leaves, stout inflated petioles, and shorter and 

 broader often toothed leaflets. On the high hills opposite The Dalles. 



Var. alatum C. & R. L e. Leaves with very narrowly linear and 

 -elongated segments fruit 5-6 lines long with broader wings. Eastern 

 Oregon to California. 



