AMMIACEAE. 251 



Sepals obsolete ; leaves in ours three to four times compound ; oil- 

 tubes 2 or more in the lateral intervals. 19. CONIOSELINUM. 

 Plant villous ; leaves ternate with rounded-cordate, lobed leaflets ; sepals 



obsolete. 20. HERACLEUM. 



Stylopodium depressed. 



Dorsal ribs prominent or winged. 



Plant caulescent, branched ; sepals mostly obsolete ; petals white. 



21. ANGELICA. 



Plant acaulescent or nearly so ; sepals evident ; petals in most yellow. 



22. CYNOMARATHRUM. 

 Dorsal wings filiform ; petals yellow ; sepals obsolete ; plant caulescent. 



23. PASTINACA. 

 Stylopodium wanting ; plant acaulescent or nearly so. 



Lateral wings of the fruit thin. 24. LOMATIUM. 

 Lateral wings of the fruit thick. 



Dorsal ribs very prominent or winged. 25. PSEUDOCYMOPTERUS. 

 Dorsal ribs filiform. 



Dwarf plants with pinnate or bipinnate leaves and conspicuous in- 



volucels. 26. CYMOPTERUS. 



Tall and stout plants with three or four times compound leaves and 



involucels of small bractlets. 27. LEPTOTAENIA. 



i. SANICULA L. SNAKE-ROOT. 



i. Sanicula marilandica L. In rich woods from Newf. and Wash, to Ga. 

 and Colo. Alt. 4000-6500 ft. Pike's Peak ; foot-hills, Larimer Co. ; mouth 

 of Cheyenne Canon ; Spring Canon ; Pennock's mountain ranch ; Dixon Canon. 



2. WASHINGTONIA Raf. SWEET CICELY. 



Involucels of several bractlets. i. W. longistylis. 



Involucels lacking or of a single small bractlet. 2. W. obtusa. 



1. Washingtonia longistylis (Torn) Britton. (Osmorrhisa longistylis Torr.) 

 In woods and copses from N. Sc. and Ass. to Ga. and Colo. Alt. 4000-6000 

 ft. Foot-hills, Larimer Co. ; Horsetooth Gulch ; Buckthorn Creek, Larimer Co. 



2. Washingtonia obtusa C. & R. (Osmorrhisa nuda Porter; not Torr.) 

 In woods from Alb. to N. M. and Calif. Alt. 6000-12,000 ft. South Chey- 

 enne Canon; Rifle, Garfield Co.; headwaters of Pass Creek; four miles west 

 of Cameron Pass ; Cedar Edge ; Jack Brook ; Upper West Mancos Canon ; 

 near La Plata Post Office; headwaters of Sangre de Cristo Creek; near 

 Pagosa Peak ; Wahatoya Canon ; Pennock's mountain ranch ; gulch east 

 of Stove Prairie; above Beaver Creek; Rabbit-Ear Range. 



3. GLYCOSMA Nutt. 



i. Glycosma occidentalis Nutt. (Osmorrhiza occidentalis Torr.) On hill- 

 sides and valleys from Alb. and Wash, to Colo, and Calif. Alt. up to 10,000 

 ft. Mountains north of Bear River below Steamboat Springs, Routt Co. ; 

 Bob Creek, West La Plata Mountains ; Rabbit-Ears, Larimer Co. 



4. CARUM L. CARAWAY. 



Leaves twice pinnately divided. i. C. Carui. 



Leaves once pinnately divided. 2. C. Gairdneri. 



i. Carum Carui L. Escaped from cultivation, in waste places from Newf. 

 and Mont, to Pa. and Colo. Alt. up to 9500 ft. Ft. Collins; mountains 

 between Sunshine and Ward. 



