374 CARDUACEAE. 



8. Helianthus giganteus L. In moist ground from Me. and Sask. to Fla., 

 La. and Colo. Mt. Harvard. 



9. Helianthus grosseserratus Martins. On plains and prairies from N. Y. 

 and Wyo. to Pa., Tex. and Colo. Ft. Collins. 



10. Helianthus fascicularis Greene. (H. giganteus utahcnsis D. C. Eaton; 

 H. utahensis A. Nelson) In mountain valleys from Ass. and Alb. to Colo, 

 and Ariz. Alt. 5000-8000 ft. Gunnison ; Parlin, Gunnison Co. ; McCoy ; 

 Canon City; Ft. Collins; mountains, Larimer Co.; Cache la Poudre; Boulder. 



51. HELIANTHELLA T. & G. 



Chaffs of the receptacle soft and scarious. 

 Rays conspicuous ; disk-flowers yellowish. 



Disk 2-3 cm. in diameter ; leaves ovate to lanceolate, thin, not strongly 

 reticulate. i- H. quinqiienervis. 



Disk less than 2 dm. wide ; leaves oblanceolate to linear, strongly reticulate. 



2. H. Parryi. 

 Rays few and scarcely surpassing the dark-purple disk-flowers. 



4. H. inicrocephala. 

 Chaffs of the receptacle firm-chartaceous. 3. H. unifiora. 



1. Helianthella quinquenervis A. Gray. Along mountain streams from S. D. 

 and Ida. to Colo. Alt. 7000-10,000 ft. Robinson; Cerro Summit; Mt. Har- 

 vard; Moon's ranch; mountains, Larimer Co.; North Park, near Teller; 

 Steamboat Springs; Leroux Park; Buffalo Pass; Four-mile Hill; foot of 

 Michigan Hill; east slope of Rabbit-Ear Range; Bosworth's ranch; Mt. 

 Abram, Ouray; Villa Grove; South Park; near Ironton, San Juan Co.; 

 West Spanish Peak; Marshall Pass; Eldora to Baltimore; Berthoud Pass; 

 Spicer. 



2. Helianthella Parryi A. Gray. In the mountains of Colo., N. M. and 

 Ariz. Alt. 8000-10,000 ft. Lat. 39-4i; Veta Pass; Ruxton Dell; Artists' 

 Glen ; Green Mountain Falls ; Marshall Pass. 



3. Helianthella microcephala A. Gray. Dry plains of Southern Colo., N. M. 

 and Utah. Alt. 4500 ft. San Juan Valley. 



4. Helianthella uniflora (Nutt.) T. & G. On hills and mountains from 

 Mont, and Ida. to N. M. and Utah. Table Rock. 



52. XIMENESIA Cav. 



i. Ximenesia exauriculata (Rob. & Greenm.) Rydb. (Verbesina encelioides 

 c.rauriculata Rob. & Greenm.) In mountain valleys from Mont, to Tex. 

 and Ariz. Alt. 5000-9000 ft. Pass Creek; Canon City; Colorado Springs; 

 Rocky Ford ; Ft. Collins ; Pueblo ; Mancos ; Hotchkiss, Delta Co. ; Huerfano 

 Valley, near Gardner; Salida; Gunnison; Manitou ; Boulder; Lafayette; 

 Montrose ; Palmer Lake ; Buena Vista ; Timnath. 



53. COREOPSIS L. TICK-SEED. 



Leaves once or twice pinnately divided. i. C. tinctoria. 



Leaves simple. 2. C. lanceolala. 



1. Coreopsis tinctoria Nutt. Low ground from Man. to Va.. Tex., Ariz, 

 and Alb. Along Platte River, near Denver. 



2. Coreopsis lanceolata L. In rich soil from Ont. and Colo, to Fla. and 

 La. Ft. Collins. 



