252 UMBELLIFER^E. PEUCEDANUM. 



mostly solitary in the intervals, or with accessory ones in some species. 



* Always acaulescent, mostly glabrous. 



-- Flowers white. 



P. Hendersoni C. '& R. Bot. Gaz. xiii, 210. Scapes 4-6 inches long, 

 decumbent from a shallow constricted tuber 6-12 lines in diameter ; leaves- 

 ternate then bipinnate, ultimate segments short and obtuse : umbel equally 

 2-5-rayed, with involucels of linear acuminate scarious bractlets ; rays 6 

 lines long; pedicels 1-2 lines long; fruit ovate very glabrous 2% lines long 

 by 2 lines broad, with thickish narrow wings more or less involute and a 

 rather prominent ridge on the commissural face : oil-tubes solitary in the 

 intervals, 2 on the commissure: seed face plane. On high hill-tops, John 

 Day Valley, Eastern Oregon. 



P. Canbyi C. & R. 1 c 78. Scapes ere"ct, 3-8 inches high, with a 

 short underground stem from a thick more or less elongated root which 

 ends in a globose tuber 6-15 lines in diameter: leaves ternate pinnate or 

 bipinnate, ultimate segments small with 3-5 linear-oblong lobes : umbel 

 equally 5-10-rayed, with involucel of narrowly linear scarious-margined 

 bractlets: rays 1-2 inches long: pedicels 4-6 lines long; fruit oblong-ovate, 

 glabrous, 4 lines long, with wings about half as broad as the body : oil- 

 tubes solitary in the intervals, 2 or 4 on the commissure. Hi^h ridges, 

 Eastern Oregon and Washington. 



P. Greyeri Watson Proc. Am. Acad. xiv, 293. Low, glabrous; root 

 moniliform with 2 or 3 small globose tubers : leaves ternate-quinate, with 

 linear leaflets 4-9 lines long: umbel small with unequal rays : involucel of 

 several linear acuminate bractlets; mature fruit unknown. Collected by 

 Geyer Spalding and Lyall, not since reported. 



P. fariiiosiim Geyer Hook Lond. Journ. Bot. vi, 235. Somewhat 

 caulescent : stems slender from a rather deep-seated small round tuber 

 4-6 lines in diameter with numerous clusters of fine rootlets on its sur- 

 face : leaves 2-3-ternate, with segments more or less lobed, ultimate di- 

 visions all linear : umbel 1-8 rayed, with involucels of few small linear 

 bractlets: rays 1-2 inches long, fruit almost sessile, oblong-elliptical, 

 glabrous, 3-4 lines long, 2 lines broad, with wings half as broad as the 

 body: oil-tubes small, 2-4 in the intervals, 4-6 on the commissure: seed- 

 face plane. From Brit. Columbia to California and Idaho. 



P. Gormani P Watsoni C. & R in Part. Stems 2-3 inches high 

 from a shallow globular tuber an inch or less in diameter with fascicles uf 

 rootlets on its surface: leaves bipinnate, the ultimate divisions oblong or 

 linear, umbel unequally 1-5 rayed with involucels of a few setaceous 

 bractlets or none: fruit sessile or nearly so; ovate, rough-puberulent 3 lines 

 long with wing more than half as wide as the body and conspicuous dor- 

 sal and intermediate ribs : oil-tubes one in each rib, 2-6 on the commis- 

 sure, seed-face plane. High hills opposite The Dalles. 



P. evittatum C. & R. Eight to eighteen inches high from a deep-seated 

 small tuber, glabrous : leaves once or twice ternate then more or less 

 pinnate into linear, callous-tipped segments 6-12 lines long: umbel some- 

 what unequal 8-18-rayed with involucels of numerous purplish lanceolate- 

 acuminate gamophyllus bractlets ; rays 1-2 inches long, pedicels short: 

 fruit oblong glabrous 4-6 lines long 2>^ lines broad, with very thin wings 

 more than half as broad as the body : oil-tubes none. Ellensburg, Wash- 

 ington. (G. R. Vasey, 1889 ) 



--' -- Flowers yellow. 

 P. Watsoni C. & R. Bot. Gaz.. xiii,. 2D9 in. Part.. Low, 2-3 inches 



