364 CARDUACEAE. 



20. Erigeron concinnus (H. & A.) T. & G. On arid plains and hills from 

 Mont, and B. C. to N. M. and Calif. Alt. 4000-7000 ft. Mancos; Grand 

 Junction; Los Pinos (Bayfield) ; Durango; Dolores. 



21. Erigeron aphanactis (A. Gray) Greene. (E. concinnus aphanactis A. 

 Gray) On dry plains from Colo, and Nev. to Calif. Antonito ; Grand Junc- 

 tion. 



22. Erigeron simulans Greene. (E. Engelmannii arenicola A. Nels.) On 

 dry hills and sandy flats from Mont, to Colo, and Utah. Alt. 6000-8000 ft. 

 Glenwood Springs; Cimarron; Gunnison; Salida; Buena Vista. 



23. Erigeron Engelmannii A. Nels. On dry plains of Wyo. and Colo. 

 Gunnison ; Gypsum ; Table Rock. 



24. Erigeron microlonchus Greene. On dry plains from Wyo. to Colo, and 

 Ariz. Alt. about 7000 ft. Cimarron. 



25. Erigeron elatior (A. Gray) Greene. (E. grandiflorum elatior A. Gray) 

 In wet places in the mountains of Wyo. and Colo. Alt. 8000-12,000 ft.- Red 

 Mountain; Silver Plume; Mt. Baldy; near Pagosa Peak; east side of Bald 

 Mountain ; Georgetown ; Rabbit-Ear Pass ; White River Plateau ; Steamboat 

 Springs; near Teller, North Park; Ruby; Villa Park; Boreas; Leroux Park; 

 Rabbit-Ear Range, Routt Co.; near Empire; headwaters of Clear Creek; 

 Robinson; Red Mountain; Silver Plume; Berthoud Pass. 



26. Erigeron Coulter! Porter. In damp places in the mountains of Colo, 

 and Utah.- Alt. 9000-12,000 ft. Lake City ; Hinsdale Co. ; Bard Valley, near 

 Empire ; Bob Creek, west of Mt. Hesperus ; Rabbit-Ear Pass ; La Plata 

 Canon ; Leroux Creek, Delta Co. ; East River ; near Pagosa Peak ; Red Moun- 

 tain, about Ouray ; Ironton, San Juan Co. ; Mt. Harvard ; Ironton Park, nine 

 miles south of Ouray ; Silverton ; Berthoud Pass. 



27. Erigeron salsuginosus (Richardson) A. Gray. In wet ground from 

 Alb. and Alaska to Colo, and Calif. Alt. 9000-12,000 ft. Middle Park; 

 Chambers' Lake ; Georgetown ; near Pagosa Peak ; Minnehaha ; Lake Mo- 

 raine ; Cameron Pass ; Marshall Pass ; mountains above Ouray ; Hahn's Peak ; 

 Mt. Harvard; Red Mountain; Ruby; Ruxton Park, Pike's Peak; Silver 

 Plume; Beaver Creek; Trappers' Lake; Berthoud Pass; Buffalo Pass; Gray's 

 Peak ; between Como and Boreas ; Twin Lakes ; Devil's Causeway ; summit 

 of North Park Range, Larimer Co. ; Hahn's Peak. 



Erigeron salsuginosus glacialis (Nutt.) A. Gray. In the higher mountains 

 from Wyo. to N. M. and Utah. Alt. 0000-12,000 ft. High Mountains, near 

 Empire; Caribou; Veta Pass. 



28. Erigeron superbus Greene. In the mountains of Colo. Alt. 7500-12,000 

 ft. Mountains near Empire; near Pagosa Peak; Minnehaha; Breckenridge ; 

 Villa Grove; Idaho Springs; Artist's Glen and Halfway House, Pike's Peak; 

 Box Canon, west of Ouray; Baxter's ranch; chaparral-covered hills southeast 

 of Ouray; mountains between Sunshine and Ward; Stove Prairie Hill; Mar- 

 shall Pass. 



29. Erigeron salicinus Rydb. In the mountains of Colo. Alt. up to 10,000 

 ft.- Pagosa Springs ; Keblar Pass ; Narrows. 



30. Erigeron macranthus Nutt. In the mountains from Mont, and B. C. to 

 Colo., Utah and Ore. Alt. 7000-10,000 ft. Lake City ; Platte River ; west 

 of Ouray; Jack's Cabin; Steamboat Springs; Keblar Pass; Durango; Cerro 

 Summit; mountains, Larimer Co.; La Veta; La Plata Canon; Mancos; Sun- 



