OP ARTS AND SCIENCES. 143 



teeth obsolete : fruit glabrous, broadly elliptical, three lines long, the 

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

 on the commissure. — P. nudicaule, Gray, Proc. Am. Acad. 8. 385. 

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



■^ Peucedanum Parryi. Acaulescent, glabrous : leaves lanceolate 

 in outline, bipinnate, the short segments laciniately pinnatifid : peduncles 

 six inches high : involucels small: tlowers yellow ; calyx-teeth evident: 

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

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

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



^ Peucedanum Nevadense. Glaucous, puberulent, shortly caules- 

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

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

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



fid : calyx-teeth somewhat prominent: fruit about 8 lines long, broadly winged, 

 scarcely eniarginate ; 4 vittae on the commissure. — Coast Rauges soutli of San 

 Francisco. * 



9. P. Hali-ii, Watson. See above. 



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

 dilated : involucels conspicuous, of usually scariously margined bractlets : 

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

 cent, puberulent. 



'^ 10. P. CARUiroLiuAi, Torr. & Gray. Shortly caulescent : leaf-segments h to 

 2 inches long : bractlets often lanceolate : fruit 3 or 4 lines long ; ribs obsolete ; 

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

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



''' 11. P. DTRicoLATUM, Nutt. More caulescent: leaves more finely divided ; 

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

 tinctly ribbed ; vittaj 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-cleft : fruit 2 or 3 lines in diameter, winged ; ribs prominent ; 

 vittje 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 : vittffi solitary, 

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

 Territory. 



