(modifié de Coste, Flore de la France 1937) :
Plante vivace; racine tuberculeuse, stolonifère ; tige de 40-80 cm, dressée, rameuse, quelquefois simple, pubescente
Écologie : (répartition d'après la flore) Bois montagneux: Normandie, Vosges, Jura. Bugey, Forez, Plateau central, Cévennes, Alpes, Pyrénées
Répartition hors de France : Espagne, Italie, Suisse, Europe centrale.
(modified from Butcher, British Flora 1961):
NOTE: the French text is more complete and up-to-date
A rather hairy, erect, branched perennial with flowering stems 30-60 cm high, growing from a tuberous rootstock.
Ecology UK: It is naturalized in damp and shady places in several parts of England.
France:
Distribution outside France: ?