General Key to the Families 



43 



XIV. ARNICA. L. 



1. A. cordifolia. Hook. Heart-leaved Arnica. 



2. A. latifolia. Bong. Broad-leaved Arnica. 



3. A. alpina. (L.) Olin. Alpine Arnica. 



4. A. Chamissonis. Less. Chamisso's Arnica. 



5. A. Parryi. Gray. Parry's Arnica. 



6. A. louiseana. Farr. Schaeifer's Arnica. 



7. A. fulgens. Pursh. Notched Arnica. 



8. A. gracilis. Rydb. Slender Arnica. 

 XV. SENECIO. (Tourn.) L. 



1. S. Balsamitse. Muhl. Golden Ragwort. 



2. S. triangularis. Hook. Giant Ragwort. 



3. S. canus. Hook. Silvery Groundsel. 



4. S. lugens. . Richards. Black-tipped Groundsel. 



5. S. pseudaureus. Rydb. Canada Ragwort. 



6. S. discoideus. (Hook.) Britton. Northern Squaw- 



weed. 



7. S. flavovirens. Rydb. Western Balsam Groundsel. 



TRIBE CYNARE^: 



XVI. SAUSSUREA. 



i. S. densa. Hook. Purple Saussurea. 

 XVII. CARDUUS. (Tourn.) L. 



1. C. Kelseyi. White Thistle. 



2. C. foliosus. Hook. Leafy Thistle. 



3. C. undulatus. Nutt. Wavy-leaved Thistle. 



SERIES II. LIGULIFLORA 



TRIBE CICHORIE^E 



XVIII. CICHORIUM. (Tourn.) L. 



i. C. Intybus. L. Chicory. 

 XIX. TARAXACUM. (Haller.) Ludwig. 



1. T. officinale. Weber. Common Dandelion. 



2. T. rupestre. Alpine Dandelion. 

 XX. SONCHUS. (Tourn.) L. 



i. S. arvensis. L. Sow Thistle. 





