Prunella vulgaris L. [ Prunella pennsylvanica Bigelow]
no HD illustration available (m1)
Prunella vulgaris L. [Labiatae]
H.G.L. Reichenbach, Iconogr. Bot. Exot. (coloured version), vol. 3 : t. 216 (1827-1830) [H.G.L. Reichenbach]