Comfrey West of the Cascade Mountains of Oregon and Washington

The Genus Symphytum

Prickly Comfrey, Rough Comfrey: Symphytum asperum (Synonym: Symphytum asperrimum)

Common Comfrey: Symphytum officinale (Synonyms: Symphytum officinale ssp. uliginosum, Symphytum uliginosum)

Hybrid Comfrey: Symphytum xuplandicum -