Physostegia virginiana (L.) Benth.
no HD illustration available (m1)
Physostegia virginiana (L.) Benth. [ Dracocephalum virginianum L.] [Labiatae]
Rev. Hort. (Paris), ser. 4, vol. 70 (70e ANNÉE - 1898): (1898) [L. Descamps-Sabouret]