Helianthus nuttallii subsp. rydbergii (Britton) R.W. Long
Helianthus nuttallii subsp. rydbergii (Britton) R.W. Long 
Arnica rydbergii Greene
Arnica rydbergii Greene 
Plants and the Blackfoot
Plants and the Blackfoot 
Key to plants of the farming and ranching areas of the Canadian prairies, A
Key to plants of the farming and ranching areas of the Canadian prairies, A 

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