Physostegia virginiana (L.) Benth. [ Dracocephalum speciosum Sweet]
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Physostegia virginiana (L.) Benth. [ Dracocephalum virginianum L.] [Labiatae]
B. Maund, Bot. Gard., vol. 1 : t. 15, fig. 1 (1825) [E.D. Smith]