OF ARTS AND SCIENCES. 143 



teeth obsolete: fruit "ilahrous, broadly ellii)tical, three liiuis long, the 

 wing half as broad as the body ; vittie three in the intervals, four or six 

 on the commissure. — P. nudicdulc. Gray, Proc. Am. Acad. 8. JiHij. 

 Collected in Northern Oregon by Hall (n. 211). 



Peucedanum Parryi. Acaulescent, glabrous : leaves lanceolate 

 in outline, bi|)innate, the short segments laciniately pinnatilid : [)eduncles 

 six inches high : involucels small: flowers yellow ; ealyx-ti^cth evident: 

 fruit oblong, glabrous, four lines long, narrowly winged; ribs liliform ; 

 vittie undetermined. — P. macrocarpum, Parry, Am. Naturalist, 9. 271. 

 In Southern Utah, by Parry (u. 85). 



Peucedancai Ni:vadensic. Glaucous, puberulent, shortly caules- 

 cent, the peduncles three to fifteen inches high : leaves compoundly 

 dissected with small oblong segments : rays often uncciual, an inch or 

 two long : involucels small, of several linear-lanceolate bractlets, usually 



fid : calyx-teeth somewhat prominent : fruit about 3 lines long, broadly winged, 

 scarcely emarginate ; 4 vittaj on the commissure. — Coast Ranges south of San 

 Francisco. 



9. P. Hallit, Watson. See above. 



§ 2. Leaves decompound ; segments narrowly linear ; petioles very brondly 

 dilated: involucels conspicuous, of usually scariously margined bractlets: 

 flowers yellow : calyx-teeth obsolete : fruit broadly elliptical, glabrous : caules- 

 cent, puberulent. 



10. P. CARTTiFOLiuu, Torr. & Gray. Shortly caulescent: leaf-segments 4 to 

 2 inches long : bractlets often lanceolate : fruit 8 or 4 lines long ; ribs obsolete ; 

 vittffi indistinct, 2 or 3 in the intervals, none on the commissure. — P. muryina- 

 tum, Benth. PI. Hartw. 312. Central California. 



11. P. DTRicuLATUM, Nutt. Morc caulesccnt : leaves more finely divided ; 

 segments half an inch long or less : bractlets usually much dilated : fruit dis- 

 tinctly ribbed ; vittje broad, solitary in the intervals, 4 to 6 on the commissure. 

 — Washington Territory and Idaho to S. California. 



§ 3. Leaves ample, very finely dissected with short filiform segments : flowers 

 yellow : involucels present : calyx-teeth obsolete : fruit glabrous. 



* Fruit orbicular or broadly elliptical : acaulescent. 



12. P. FCENicuLACEUM, Nutt. Tomcutose, sometimes glabrous : involucels 

 gamophyllous, 5-7-cIeft : fruit 2 or 3 lines in diameter, winged ; ribs prominent ; 

 vittfe 1 to 3 in the intervals, 2 to 4 on the commissure. — From the Saskatcha- 

 wan to Nebraska and the Indian Territory. 



13. P. MILLEFOLIUM, Watson. Glabrous, taller : involucels of distinct linear 

 bractlets : fruit 4 or 5 lines long, 3 or 4 broad, broadly winged : vittae solitary, 

 2 on the commissure. — Bot. King's Rep. 129. Northern Utali to Washington 

 Territory. 



