Rhododendron subgenus Azaleastrum is a subgenus of the genus Rhododendron.
The subgenus included two sections, however in 2005, Choniastrum was elevated to subgenus rank, but sections Sciadorhodion and Tsutsusi were added, providing a new total of three sections. Azaleastrum sect. Azaleastrum (10 species) Azaleastrum sect. Sciadorhodion (16 species) Azaleastrum sect. Tsutsusi (81 species)
References
Bibliography Wilson EH, Rehder A. A MONOGRAPH OF AZALEAS RHODODENDRON SUBGENUS ANTHODENDRON. THE UNIVERSITY PRESS, CAMBRIDGE April 15 1921. PUBLICATIONS OF THE ARNOLD ARBORETUM, No. 9