Rhododendron subg. Azaleastrum explained

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 (4 species)
• Azaleastrum sect. Sciadorhodion
• Azaleastrum sect. Tsutsusi (81 species)

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
• 10.3767/000651908X608070 . Classification of the Vireya group of Rhododendron (Ericaceae) . 2008 . Craven . L.A. . Goetsch . L.A. . Hall . B.D. . Brown . G.K. . Blumea - Biodiversity, Evolution and Biogeography of Plants . 53 . 2 . 435.