Children (58 direct children, 73 direct and indirect children):
Symphytum officinale
(tree size 3)
True comfrey
Symphytum tuberosum
(tree size 2)
Tuberous comfrey
Symphytum bulbosum
Symphytum ×uplandicum
Symphytum uplandicum
Symphytum cordatum
Symphytum asperum
(tree size 1)
Prickly comfrey
Symphytum ibericum
Georgian comfrey
Symphytum cycladense
Symphytum orientale
Symphytum caucasicum
Symphytum abchasicum
Symphytum besseri
Symphytum popovii
Symphytum tauricum
(tree size 1)
Symphytum tanaicense
Symphytum sylvaticum
Symphytum savvalense
Savvalian comfrey
Symphytum pseudobulbosum
Symphytum podcumicum
Podkumian comfrey
Symphytum ottomanum
Symphytum mosquense
Symphytum microcalyx
Symphytum longisetum
Symphytum kurdicum
Symphytum insulare
Symphytum incarnatum
Symphytum hyerense
Symphytum × hyerense
Symphytum hajastanum
Hajastanian comfrey
Symphytum gussonei
Symphytum grandiflorum
Symphytum euboicum
Symphytum davisii
(tree size 1)
Symphytum creticum
(tree size 1)
Symphytum circinale
Symphytum carpaticum
Symphytum brachycalyx
Symphytum bornmuelleri
Symphytum anatolicum
Symphytum aintabicum
Symphytum armeniacum
Symphytum peregrinum
Symphytum naxicola
Symphytum longipetiolatum
Symphytum icaricum
Symphytum floribundum
Symphytum × bicknellii
Symphytum ×bicknellii
Symphytum × foliosum
Symphytum ×foliosum
Symphytum × hidcotense
Symphytum ×hidcotense
Symphytum × perringianum
Symphytum ×perringianum
Symphytum × polonicum
Symphytum ×polonicum
Symphytum × ullepitschii
Symphytum ×ullepitschii
Symphytum sepulcrale
(tree size 2)
Symphytum uliginosum
Symphytum bohemicum
Symphytum asperrimum
Symphytum ×norvicense
Symphytum regium
Symphytum uplandicum
(tree size 4)