2G8 UMBELLIFER^. Peucedanum. 



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



brous ; oil-tubes solitary. 



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



toothed at the apex : involueels none : fruit oblong. 1. P. leiocaui'um. 



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



fruit oblong. 2. P. tiliternatum. 



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

 ent : fruit orbicular. 

 Leaves ternate : leaflets cordate : fruit large, eniarginate at each end. 3. P. Euiiyptera. 

 Leaves biternate : leaflets oval, laciniate or pinnatitid : 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 i to 2 inches long : bractlets often lanceolate : ribs obsolete : 



oil-tubes iudistinet. 5. p. caruifolium. 



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

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



* * * 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 qninate or with inn- 

 nate divisions, the segments large, hroad, or elongated: involacels small or 

 none : fiowers yellow; calyx-teeth obsolete, except in No. ^ : fruit ghdirous ; 

 oil-tabes solitary in the intervals. 



^ Acaidescent, glabrous : fruit oblong : involucels none. 



1. P. leiocarpum, Xutt. Scape often very stout, |- to U- feet liigh, from a 

 thick elongated root : leaves biternate or ternate-quinate ; leaflets usually thick, 

 ovate to narrowly lanceolate, an inch or two long, acute, sharjily 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. G26 ; Seseli leiocarpum, 

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



FromPuget Sound to the Sacramento Pdver, and in the mountains eastward from Idaho to 

 Sierra County, Lemrnon. The Californian specimens are the broader-leaved Ibrm, ajjproaching 

 P. NuTTALLii, Watson {P. lafifolium, 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. 

 -f- Fruit oblong : leaflets linear, entire : ptidjerident. 



2. P. triternatum, Xutt. Finely puberulent : stems 1 to 21 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, 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. 62G. 

 Seseli triternatum, Pursh : Hook. Fl. i. 204, t. D4. 



