270 



IMlJELJ.li'ElMO. J'cucedunu, 



similar but distinctly ribbed ; the broad oil-tubes solitary in the intervals, 4 to G on 

 the commissure. — Torr. & Gray, Fl. i. G28. 



From Wasliingtuii Tuiritoiy uiul Idaho to Soullieni Cluhforuia, heiiueiit ; Los Aiiguks {llich) ; 

 Ojui, Ouvdalc. 



§ 'S. Led i'cs irri/ Ji 11(1 1/ iliascdal with imrrnw mimcutu : Jlowcrs yellow: (iraiilcturiit, 



pubescent. 



7. P. villosum, iS'utt. More or less densely jjubescent, 3 to G inches high: 

 leaves witli very numerous somewhat crowded small narrow segments : llowering 

 umbels dense ; invohicels of several small linear bnictlets : fruit oval, ])uhes(:ent ; 

 oil-tubes probably several in the intervals. — Watson, Bot. King Exp. 131. 



The mature fruit is not knowu. The range appears to he froiu tlio base of the Siena Nevada in 

 Western Nevada to Noilliern Arizona and eastward to Nebraska and S. Utah. The species nearly 

 resenilile.s P. /ainiculacruui, Nntt., of tlie eastern plains, which is taller, with ample leaves anil 

 nearly filiform segments, the fruit smooth, witli prominent ribs and 1 to 3 oil-tubes in the intervals. 



Another species, allied to P. /cuiiiculdccuiii, ranging from N. Utah to Idalio and ))ossiMy to 

 N. E. California, is 1*. mu.i.kI'oi.IUM, Watson. 'J'his is glaliroua tlirougluiut, with ample finely 

 dissected leaves, large broadly winged glabrous fruit, and solitary oil-tubes. 



§ 4. Leaves much dissected ivith small segments : flowers ivhile ; cahjx-teeth present: 

 somewhat caulescent or nearly acaulescent, pubescent. 



* Fruit f/labrous, oblong or broadly elliptical. 



8. P. macrocarpum, N utt. ^lore or less imbescent : stems usually tufted, \ 

 to 1 foot higli : fertile rays nearly equal, an incli or two long ; involucels conspic- 

 uous, of several somewhat foliaceous lanceolate or linear bracts, often united and 

 unilateral: fruit oblong, 4 to 10 lines long, 2 or 3 lines wide, exceeding the pedi- 

 cels ; ribs filiform ; wings half as wide as tlie seed ; oil-tubes solitary or rarely 2 or 

 3 in the intervals, 2 to 4 on the commissure. — Torr. & Gray, Fl. i. G27 ; Watson, 

 Bot. King Exp. 130. 



Var. eurycarpum, (Jrny. Fruit 4 or 5 lines wide, but slightly narrower at the 

 uuds, the wings liroader tlmn the seed : leaves usually rather more coarsely divided. 

 — Proc. Am. Acad. viii. 385. 1'. uudicaule, var. (1) eliijilicum, Torr. & Gray, 

 Pacif. K. Pep. ii. 121. 



Frequent from Wa.sliington Territory to the Saskatchewan, southward to N. California and N. 

 Nevada. The variety is apj)arently the more prevalent fomi in California, ranging from Oregon 

 to the Sacramento, and scarcely occurring east of the Sierra Nevada. 



* * Fruit lomentose or puberulent, oval-orbicular. 



9. P. dasycarpum, Torr. & Gray. More or less densely villous-tomentose, 

 \ to 1 foot high : leaves finely dissected with narrow or filiform segments : fertile 

 rays nearly equal, an inch or two long; involucels of several linear to lanceolate or 

 oval bractlets, free or united at base : fruit orbicular or ovat(i, often acutish above, 

 tonientose, 4 to 7 lines long, 3 to 5 broad; ribs j)romineiit ; oil-tiil)es usually 3 

 (rarely solitary) in the intervals, 4 on the commissure. — Fl. i. G28. 7'. tumentusuni, 

 Benth. PI. Hartw. 312. 



Central Calirornia, from Mendocino antl Placer counties to San Luis Obispo, on dry hillsides. 

 10. P. Nevadense, AVatsim. Glaucous, puberulent: leaves less compoimdly 

 dissected, the .stjgmeiiLH coarser : rays often unequal, 1 or 2 inclii'S long; involucels 

 smaller, of .several linear-lanceohite bractlets, usually distiiutt; fruit somiiwhat pubes- 

 cent, nearly orbicular to ovate, 3 to 5 lines long, 2 to 4 wide ; ribs ])romini;iit ; 

 calyx-teeth obsolete ; oil-tubes 2 or 3 in the intervals, or 4 in the lateral ones (per- 

 haps very rarely solitary), 4 to G on the commissure. — Proc. Am. Acad. xi. 143. 

 P. uudicaule, Watson, liot. King I'lxp. 130, and others, not Nuttall. 



On tlie eastern side of the Sierra Nevada fnin Nortlieast(U-n California to Sonora and New 

 Mexico. This much resembles P. ni'DIOAim.k, Nutt, to which it has been ordinarily referred, a 

 more uortlieru and eastern species, ranging from Nobmska and Northern Colorado to Idaho. 



