General Key to the Families 



43 



XIV. 



XV 



Arnica. L. 



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



A. latifolia. Bong. Broad-leaved Arnica. 



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



A. Chamissonis. Less. Chamisso's Arnica. 



A. Parryi. Gray. Parry's Arnica. 



A. louiseana. Farr. Schaeifer's Arnica. 



A. fulgens. Pursh. Notched Arnica. 



A. gracilis. Rydb. Slender Arnica. 

 Senecio. (Tourn.) L. 



1. S. Balsamitse. Muhl. Golden Ragwort. 



2. S. triangularis. Hook. Giant Ragwort. 

 S. canus. Hook. Silvery Groundsel. 

 S. lugens. Richards. Black-tipped Groundsel. 

 S. pseudaureus. Rydb. Canada Ragwort. 

 S. discoideus. (Hook.) Britton. Northern Squazv- 



weed. 

 S. flavovirens. Rydb. Western Balsam Groundsel. 



TRIBE CYNARE^ 



XVI. Saussurea. 



I. S. densa. Hook. Purple Saussurea. 

 XVIL 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^ 



XVIII. 



XIX. 



XX. 



CiCHORiUM. (Tourn.) L. 



I. C. Intybus. L. Chicory. 

 Taraxacum. (Haller.) Ludwig. 



1. T. officinale. Weber. Coniuion Dandelion. 



2. T. rupestre. Alpine Dandelion. 

 SoNCHUS. (Tourn.) L. 



I. S. arvensis. L. Sow Thistle. 



