268 UMBELLIFER^E. - Peucedanum. 



* Leaves not decompound, the segments large or broad or elongated : flowers yellow : fruit gla- 



brous ; oil-tubes solitary. 



Acaulescent, glabrous : leaflets ovate to narrowly lanceolate, entire or 



toothed at the apex : involucels none : fruit oblong. 1. P. LEIOCARPCM. 



Mostly caulescent, puberulent : leaflets linear, entire : involucels small : 



fruit oblong. 2. P. TRITERNATTTM. 



Shortly caulescent, glabrous : leaflets ovate, toothed : involucels pres- 



ent : fruit orbicular. 



Leaves teniate : leaflets cordate : fruit large, emarginate at each end. 3. P. EURYPTERA. 

 Leaves biternate : leaflets oval, laciniate or pinnatifid : fruit smaller, 



scarcely emarginate : calyx-teeth prominent. 4. P. PARVIFOLIUM. 



* * Leaves decompound ; segments narrowly linear ; petioles broadly dilated : involucels 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 | inch long : bractlets usually much dilated : ribs dis- 

 tinct : oil-tubes broad. 6. P. UTRICULATITM. 



* * * Leaves much dissected : low, pubescent. 



Segments narrow : flowers yellow : fruit pubescent, oval : acaulescent. 7. P. VILLOSUM. 

 Segments small : flowers white : somewhat caulescent. 



Pubescent : fruit glabrous, oblong or broadly elliptical : involucels 



conspicuous. 8. P. MACROCARPUM. 



Villous-tomentose : fruit tomentose, orbicular or ovate. 9. P. DASYCARPUM. 



Glaucous, puberulent : fruit somewhat pubescent, roundish to ovate. 10. P. NEVADENSE. 



1. Leaves not finely dissected, ternate or biternate, sometimes quinate or with pin- 

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

 none : flowers yellow ; calyx-teeth obsolete, except in No. 4 : fruit glabrous ; 

 oil-tubes solitary in the intervals. 



* Acaulescent, glabrous : fruit oblong : involucels none. 



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

 thick elongated root : leaves biternate 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 : base of the umbel and umbellets often dilated ; 

 rays usually few, unequal, 2 to 8 inches long ; pedicels 1 to 5 lines long, usually 

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

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

 in pairs, 4 on the commissure. Torr. & Gray, Fl. i. 626 ; Seseli leiocarpum, 

 Hook. Fl. i. 262, t. 93. 



From Puget Sound to the Sacramento River, and in the mountains eastward from Idaho to 

 Sierra County, Lemmon. The Californian specimens are the broader-leaved form, approaching 

 P. NUTTALLII, Watson (P. Iniifolium, Nutt.), which appears not to have been collected within 

 the State. It is distinguished by 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 biternate and leaflets ovate to orbicular. 



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

 -t- 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 loaf, 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, unequal, 1 to 4 inches long ; involucels of a few narrow 

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

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

 oil-tubes distinct, 2 broad ones on the commissure. Torr. & Gray, Fl. i. 626. 

 Seseli triternatum, Pursh ; Hook. Fl. i. 204, t. 94. 



