252 AMMIACEAE. 



2. Carum Gairdneri (H. & A.) A. Gray. In valleys from Alb. and Wash, to 

 Colo., Ariz, and Calif. — Steamboat Springs ; near Bear River, above Hayden, 

 Routt Co. 



5. CICUTA L. Water Hemlock, Musquash Root. 



I. Cicuta occidentalis Greene. (C. maculata Coulter; not L.) In water 

 and wet meadows from N. D. and Ida. to N. M. and Calif.— Alt. 5000-8000 ft. 

 • — Trinidad ; lola ; Pagosa Springs ; Ft. Collins ; Wahatoya Creek. 



6. OREOXIS Raf. 



Involucels linear, entire. 



Oil-tubes more than one in the intervals; plant glabrous. 1. O. hwnilis. 



Oil-tubes solitary in the intervals ; plant usually puberulent. 2. O. alpina. 



Involucels ovate or lanceolate, toothed. 3. 0. Bakeri. 



1. Oreoxis humilis Raf. On the higher peaks of Colo.- — Alt. 11,000-13,000 

 ft. — Pike's Peak; Bear Creek Divide; West La Plata Mountains; Mount 

 Garfield. 



2. Oreoxis alpina (A. Gray) C. & R. (Cymopterus alpinus A. Gray) On 

 the higher peaks of Colo, and Utah. — Alt. 10,000-12,000 ft. — Georgetown; 

 headwaters of Clear Creek; Gray's Peak; mountains above Boreas; mountain 

 near Veta Pass ; Mount Ouray ; Bob Creek Divide, West La Plata Mountains ; 

 above Beaver Creek; Cameron Pass; Berthoud Pass. 



3. Oreoxis Bakeri C. & R. On the higher peaks of Colo. — Alt. 10,000-13,000 

 ft. — Alpine Tunnel; Mt. Hayden; near Pagosa Peak; West Spanish Peak; 

 Mount Ouray. 



7. HARBOURIA C. & R. 



I. Harbouria trachypleura (A. Gray) C. & R. {Cicuta trachypleura S. 

 Wats.) In mountains from Wyo. to N. M. — Alt. 5000-10,000 ft. — Foot-hills 

 near Golden ; Bosworth's ranch. Stove Prairie ; foot-hills west of Ft. Collins ; 

 foot-hills, Larimer Co. ; Horsetooth Gulch ; Rist Canon ; Howe's Gulch ; gulch 

 west of Pennock's ; west of Soldier Canon ; mountains between Sunshine and 

 Ward; Boulder; Empire. 



8. ZIZIA Koch. Meadow Parsnip, Alexanders. 



I. Zizia cordata (Walt.) Koch. In wet meadows and woods from Conn., 

 Sask. and Wash, to Ga., Ala. and Utah. — South Park; Pinkham Creek, 

 Larimer Co. 



9. ALETES C. & R. 



Peduncles longer than the leaves ; branches of the umbels short. 



Leaflets rounded-obovate in outline; their teeth ovate. i. A. obovata. 



Leaflets rhombic-cuneate in outline, incised-toothed with lanceolate acuminate 

 teeth. 2. A. acaulis. 



Peduncles shorter than the leaves ; branches of the umbels nearly as long as 



the peduncles. 3. A. humilis. 



1. Aletes obovata Rydb. On the mountains of Colo. — Alt. about 7000 ft. — 

 Golden ; Lower Boulder Canon, Boulder Co. ; near Morrison. 



2. Aletes acaulis (Torr.) C. & R. {Deweya acaulis Torr. ; Carum Hallii 

 S. Wats.) In the mountains of Colo, and N. M. — Alt. up to 10,000 ft. — Near 

 Morrison; South Table Mountain; Golden; gulch south of Boulder; moun- 

 tains between Sunshine and Ward. 



