Drymocallis is a genus of perennial herbaceous plants in the rose family (Rosaceae), order Rosales. The genus was long folded into the broad aggregate genus Potentilla (cinquefoils), but molecular phylogenetic analyses of DNA sequence data showed that Drymocallis species are more closely related to the allied genera Chamaerhodos and Dasiphora than to core Potentilla species such as the creeping cinquefoil (Potentilla reptans), prompting recognition of Drymocallis as a distinct genus.
The genus was formally described by the American botanist Per Axel Rydberg in 1908, with credit given to Jules Pierre Fourreau. Plants of the World Online recognises approximately 24 species, while GBIF lists 36 accepted descendants. Species occur across the Northern Hemisphere, with representatives in North America, Europe, and Asia. Notable members include Drymocallis rupestris (rock cinquefoil), widespread in Europe and temperate Asia; Drymocallis glandulosa (sticky cinquefoil), native to western North America; and Drymocallis arguta (tall cinquefoil or prairie cinquefoil), found across North America. At least three species in the genus are known or suspected to be protocarnivorous — capable of trapping and potentially digesting small invertebrates via glandular hairs — making Drymocallis of particular interest to researchers studying the evolution of carnivory in plants.
Etymology
The name Drymocallis derives from the Greek drymos (oak wood, thicket) and kallos (beauty), alluding to the woodland or rocky habitats favoured by many species.
Distribution
Species of Drymocallis are distributed across temperate regions of the Northern Hemisphere, including western and central North America, Europe (with D. corsica endemic to Corsica), and temperate Asia. Drymocallis rupestris has one of the broadest ranges, extending across Europe into Siberia and Central Asia.
Taxonomy Notes
Drymocallis was segregated from Potentilla by Rydberg in 1908. DNA sequence data supports this separation, placing Drymocallis closer to Chamaerhodos and Dasiphora than to core Potentilla. The genus is still occasionally included within a broadly circumscribed Potentilla in some treatments, reflecting ongoing taxonomic debate within Rosaceae tribe Potentilleae.
