3 species
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Symphytum asperumprickly comfrey, rough comfrey
Distribution: Introduced and occasionally escaped from cultivation, scattered in the United States; chiefly west of the Cascades in Washington.
Habitat: Roadsides and other disturbed habitats.
Origin: Introduced from sw Asia
Flowers: May - July
Growth Duration: perennial
Symphytum officinalecommon comfrey
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains, northern Great Plains, and eastward from Great Lakes region to the Atlantic Coast.
Habitat: Escaped from cultivation, often found in disturbed areas.
Origin: Introduced from Europe
Flowers: May-August
Growth Duration: perennial
Symphytum ×uplandicumhybrid comfrey
Origin: Introduced from Europe
Growth Duration: perennial