Physostegia virginiana (L.) Benth. [ Physostegia imbricata Hook.]
no HD illustration available (m1)
Physostegia virginiana (L.) Benth. [ Dracocephalum virginianum L.] [Labiatae]
W. Curtis, Bot. Mag., vol. 62 [ser. 2, vol. 9]: t. 3386 (1835) [n.a.]