2G8 



UMiiELLIFER^. • " • Peucedanum. 



♦ leaves not deconipouiul, the seginuiits liirge or broad or elongated: flowers yellow : I'luit gla- 



brous ; oil-tubc8 solitary. 



Acaiilcscent, glabrous : It^allots ovate to narrowly lan.eolato, ouliro or 



toothed at till) ajM'X : iiivoluiels none : fruit oblong. 1. P. l.ElocAKi-UM. 



Mostly caulescent, iiuberulent : leaflets linear, entire : involueels snniU : 



fruit olilong. '-2. P- tihtkiinatum. 



Shortly eaukseent, j^'labrous : leaflets ovate, toothed : involueels pres- 

 ent : fruit orbicular. 

 Leaves ternato : leaflets cordate : fruit large, emarginate at each end. 3. P. Eukyptkua. 

 Leaves bitemate : leaflets oval, laciniate or pinnatificl : fruit smaller, 



scarcely emarginate : calyx-teeth proniinent. 4. P. pauvifouum. 



♦ ♦ Leaves decompound ; segments narrowly linear ; })etiole3 broadly dilated : involueels con- 



spicuous : flowers yellow : fruit glabrous, elliptical : caulescent, puberulent. 



Segments ^ to 2 inches long : bractlets often lanceolate : ribs obsolete : 



oil-tubes indistinct. 5. P. caruifolium. 



Segments rarely J inch long : bractlets usually much dilated : ribs dis- 

 tinct : oil-tubes broud. 6. P. UTRICULATUM. 



♦ * » Leaves much dissected : low, pubescent. 



Segments narrow : flowers yellow : fruit pubescent, oval : acaulescent. 7. P. vii.i.osuM. 

 Segments small : flowers while : somewhat caulescent. 



Puljescent : fruit glabrous, oblong or broadly elliptical : involueels 

 conspicuous. 



Villous-tonionloHo : fruit |onuuilo.so, orbicular or ovate. 



(iluuoouH, puburuhmt : fruit homuwhal puliescout, KuindiHh to ovate. 



§ 1. Leaves not finely dissected, ternate or bitemate, sometimes quinate or with ])in- 

 nate divisions, the segments large, broad, or elongated : involueels small or 

 none : fiowers yellow; calyx-teeth obsolete, except in No. i : fruit glabrous; 

 oil-tubes solitary in the intervals. 



* Acaulescent, glabrous : fruit oblong : involueels none. 



1. P. leiocarpum, Nutt. Scape often very stout, | to 1^ feet high, from a 

 thick eloiigatetl root: leaves Liteniate or ternate-quinate ; leaflets usually thick, 

 ovate to narrowly lanceolate, an inch or two long, acute, sharply few-toothed near the 

 apex or the narrower form entire : hivse, of the umhel and umbellets often dilated ; 

 rays usually few, une(iual, 2 to 8 inches long; pedicels 1 to 5 lines long, us\ially 

 short : fruit 4 or 5 lines long, 2 lines broad, narrowed below, the ribs rather promi- 

 nent, and tlie wing half as wide as the seed ; oil-tubes distinct, the lateral sometimes 

 in pairs, 4 oji the commissure. — Torr. & Gray, Fl. i. G2G ; Seseli leiocai-j>um, 

 Hook. FI. i. 2fi2, t. 93. 



From Paget Sound to the Sacramento l{iv(!r, ami in the mountains eastward from Idaho to 

 Sierra County, Ixminon. The Californian .H|ieciuu'ns are the broader-leaved form, approaching 

 P. NuTTALi.ii, Watson {P. bUifoUam, Nutt.), which appears not to have been collected within 

 the State. It is distinguished liy its more ovate, very narrowly winged and more obscurely ribbed 

 fruit (3 to 4 lines long and 2 wide), with 3 or 4 obscure oil-tubes in the intervals and 4 to 6 on 

 the commissure ; leaves bitemate and leaflets ovate to orbicular. 



* * Caulescent, except sometimes in No. 2 : involucellate. 

 +- Fruit oblong : leaflets linear, entire : puberulent. 



2. P. triternatum, Nutt. Finely puberulent : stems 1 to 2^ feet high, with 

 rarely more than a single cauline leaf, often acaulescent : leaves biternate or ternate- 

 quinate, the divisions rarely pinnate ; the segments linear, or rarely oblong, acute, 1 

 to 4 inches long : rays few, unefiual, 1 to 4 inches long ; involueels of a few narrow 

 bractlets, usually snuvU ; pedicels very short : fruit rarely pubescent, 3 or 4 lines 

 long, 1 to 1^ lines wide, narrowest below, very narrowly winged, ilistinctly ribbed ; 

 oil-tubes distinct, 2 broad ones on the commissure. — Torr. & Ciray, Fl. i. 62G. 

 Seseli triternatum, Pursh ; Hook. Fl. i. 204, t. 1)4. 



