References
Grant, E., and C. Epling. 1943. A study of Pycnanthemum (Labiatae). Univ. of Calif. Publ. in Botany 20: 195-240. Google Scholar
Grant, E., and C. Epling. 1943. A study of Pycnanthemum (Labiatae). Univ. of Calif. Publ. in Botany 20: 195-240. Google Scholar