Dracocephalum virginianum L. (Physostegia virginiana (L.) Benth.) occurs widely in east-central North America, ranging from Quebec to Minnesota, south to Delaware and Missouri and in the Appalachians to North Carolina and Tennessee. Numerous varieties are found throughout this wide range, some of which have been described as separate species but mostly with intermediate forms difficult to distinguish.
Notes and News: The Granulose Variety of the Virginia Dragonhead
- Earl L. Core
- David S. Lee, Arnold W. Norden, Homer Duppstadt, Lionel N. Eleuterius, and J. Dan Pittillo
- December - 1972