For Agastache
Harley et al. 2004. In Kadereit, J.W. 2004. The families and genera of vascular plants. VII. Flowering plants – Dicotyledons – Lamiales (except Acanthaceae including Avicenniaceae). Springer, Berlin. 478 pp.
Lint, H., and C. Epling. 1945. A revision of Agastache. Amer. Midl. Nat. 33: 207-230.
Vogelmann, J.E. 1985. Crossing relationships among North American and eastern Asian populations of Agastache sect. Agastache (Labiatae). Syst. Bot. 10: 445-452.
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