56 

 Systematic Synopsis. 



5; 1. Mostly low, from globose tubers (single or monililorni): leaves 

 small, more or less dissected, with short segments (unless in P. amhigaum): 

 fruit- wings narrow (not more than half as broad as body): oil-tubes mostly 

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



* A/xcays acaiilcscott and ntostlv glabrous : /fo-ccrs white. 



1. P. Hendersoni C. & R. ]>ot. Gazette, \iii. 210. From a 

 shallow constricted tuber 6 to VI lines in diameter: leaves tcrnate 

 then bipinnate, ultimate segments short and obtuse: umbel ec[ually 

 2 to r)-rayed, with involucels of linear acuminate scarious bractlets; 

 rays about half inch long; pedicels I14 to 2 lines long: fruit ovate, 

 glabrous, 2]4 liney long, 2 lines broad, with thickish narrow wings 

 (not half as broad as body) more or less involute, filiform or nearly 

 obsolete dorsal and intermediate ribs, and a rather prominent ridge 

 on the commissural face: oil-tubes solitary in the intervals, 2 on the 

 commissural side: seed-face plane. (Fig. 40.) 



On high hill-tops, Oregon. John Day Valley, May, 18S2 (Howell B in 

 part), and Lost Valley, Jinie, 1882 (HoiceU 410). 



Dedicated to L. F. Henderson, one of our best Oregon collectors. The 

 fruit of this species, in its thickish involute wings and rather prominent 

 commissural ridge, very nearly approaches that ot Ororienia fu>ilf(>nni)i 

 Watson. 



2. P. Canbyi C. & R. Bot. Gazette, xiii. 78. Three to 

 eight inches high, v.ith a short underground stem from a thick 

 more or less elongated rootstock which ends in a globose tuber () 

 to 12 lines in diameter: leaves ternate-pinnatifid or bipinnate, 

 idtimate segments small, with 8 to 5 linear-oblong lobes: umbel 

 ec|ually 5 to 10-rayed, with involucels of narrowly linear scarious- 

 margined bractlets; rays 1 to 2 inches long; pedicels 4 to t) lines 

 long: fruit ovate-oblong, glabrous, 4 lines long, 2% lines broad, 

 with wings about half as broad as body, and filiform dorsal and 

 intermediate ribs: oil-tubes solitary in the intervals (lateral inter- 

 vals often with 1 or 2 accessory l>ut shorter ones), 2 or 4 on the 

 commissural side. 



High ridges, E. Oregon {Huivell, April, 18S0. and May, 1882, no. (i7; 

 Ctinick 1010, in 1882 and 188-1) and Washington Territory, Klickitat county 

 {Howell), and Spokane River. 



This species has been referred to P. Xevadense, but always with a 

 doubt. In Howeirs distribution it is labeled P. daHycarpum. It has been 

 collected too often in its early condition, before either fruit or leaves had 

 matured, and in this state has been very pu/.zling. Mature fruit of Cusick's 



