Rhododendron calendulaceum (Michx.) Torrey [ Azalea calendulacea Michx.]
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Rhododendron calendulaceum (Michx.) Torrey var. subcuprea
[Azalea calendulacea Michx. var. subcuprea] [Ericaceae]
J. Lindley, Edwards’s Bot. Reg., vol. 16 : t. 1366 (1830) [M. Hart]