Template:Rydberg, 1927

• Rydberg, P.A. 1927. North American Flora Volume 34, Part 4. (Carduales). Carduaceae. Liabeae, Neurolaeneae, Senecioneae (pars). New York, NY: New York Botanical Garden. BHL  
  • Find all Wikispecies pages which cite this reference.