75 



\';ii . tenuifolius. nflm Iiiil^ii .hkI mun.' In aiirliin-, w itii 

 ii:in<)\vl\- liiicnr k';itlL'l> ' _. lo 1 ' _. iinlii-s loii'^. '/'lias piiim ( ? ) 

 iiKiiitaniini, \;ir. (?) Iriiiilfuliiiiii (ir;i\, I'l. W li'Ljht . ii. •'»'"'•. /.ii;/is- 

 tit'iiDi iiiDiilaiiKiii^ WW. tciiiiihiHiiin Walton, Uilil. IikKn I'oKpct. 



S.-iiu.- laii-c as tl>r s|..-cirs. 

 \'ar. purpureus, Sl.oilh caulcsccMit, witli rather weak 

 ;;sccii(liii<^ pediimlcs (':\ to •*» inclics lonj^j), aiul purple Hdwcis. 



Saiuly soil, Arizona, Mt. Hiimpluoys. July, iss:; tUiishi/ (uVI), and 

 Fiaf-'staff (/^((.s/>.v G;;1. August, iHS'd; ■fonr.H. August, isst; Liniiiioii, Septem- 

 ber, 1S.S4; Trarii -i:!."), Juno 21, lSt<7). 



2. p. bipinnatus. Ccspitosc, the short l)ianches of tho 

 rootstock covered witli the crowded remains of dead leaves, ghui- 

 coiis, puberulent or ghibror.s: leaves pinnate with few pairs of 

 short segments, which are pinnately divided into short linear lohcs: 

 scapes 4 to !S inches high, much exceeding the leaves; rays 1 to 4 

 lines long; involiicels of few linear-lanceolate bractlets; flowers 

 white: fruit nearly sessile, ovoid, 1 1^ to 8 lines long, niotler- 

 ately flattened dorsallv, the 5 thickish carpel wings equal and nar- 

 rov,' (often being but very prominent acute ribs), wMth obscure 

 strengthening cells: oil-tubes 8 or 4 in the intervals, I) to 8 on the 

 commissural side: seed-face concave. (I'^ig. 74.) — CynwptcrKS 

 hifiniiatiis Watson, Proc. Am. Acad. w. 8()8. 



Montana, in the mountains south of Virginia City (Hin/drn, in IsTl. 

 under ('umnpfaniK /(Tiiiculaceux^, near Bannocii City ( Watson, in ISSO), 

 Mt. Helena (f'«H/>»/, in 18S:j), Shields River (Scrilnwr (K! c, in iss:!), along 

 X. P. R. R. {Tireedy 291, in 18.s2); Dakota, Black Hills iliusl,!,, in issTi. 



8. p. anisatuS. Acaulescent, cespitost' from a much 

 branched caudex which is mure or less coveretl witli the remains 

 of old leaves: leaves on long petioles, narrow, somewhat rigid, 

 pinnate and the leaflets pinnately-parted into linear (sometimes 

 linear-oblong) pungently acute segments: peduncles () to 12 inches 

 high, exceeding the leaves; umbel unequally T) to l2-rayed, with 

 iuvoluccls of linear-subulate (sometimes lolied ) bractlets exceed- 

 ing the white or vellow flowers; ravs '4 to 8 inches long; pedicels 



1 to 8 lines long: fruit about 2 lines long, the carpel irregularh 



2 to r)-winged, with prominent group of strengthening cells in 

 each one: oil-tubes 1 to 8 in the intervals, 2 to 4 on the commis- 

 sural si<le: seed-face plane. (Figs. 75, 70.) — Cvuiof^tcriis tercbin- 



