Symphytum asperum is a flowering plant of the genus Symphytum in the family Boraginaceae. Common names include rough comfrey[1] and prickly comfrey.[2] It is the tallest Symphytum species.[3] It is native to Asia, and it is known in Europe and North America as an introduced species and sometimes a weed. Symphytum × uplandicum, the naturally occurring hybrid with the common comfrey (Symphytum officinale), is the economically most important kind of comfrey.
^BSBI List 2007(xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-06-26. Retrieved 2014-10-17.
^USDA, NRCS (n.d.). "Symphytum asperum". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 7 December 2015.
^Hills, Lawrence D. (2011-10-20). Comfrey: Past, Present and Future. Faber & Faber. ISBN 978-0-571-28091-9.
Symphytumasperum is a flowering plant of the genus Symphytum in the family Boraginaceae. Common names include rough comfrey and prickly comfrey. It is...
(syn. S. bohemicum). A common hybrid is formed between Symphytum officinale and S. asperum, Symphytum × uplandicum, also known as Blue Comfrey, or Russian...
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