Hieracium gracile subvar. densifloccum Zahn Pflanzenr. , IV, 280: 1133 (1922)

Nomenclatural References

• literature : Das Pflanzenreich: Regni vegetablilis conspectus. (1900-1937) at BHL. From parsing micro citation.
• person : Karl Hermann Zahn (1865-1940) Based on occurrence of standard abbreviation 'Zahn' in the authors string.
• database : IPNI record: 290163-2