Rhododendron subg. Choniastrum is a subgenus of the genus Rhododendron, originally a section of subgenus Azaleastrum it was elevated to subgenus rank after cladistic analysis revealed that together with Rhododendron it formed a major clade, distinct from other sections of Azaleastrum.
Species The subgenus includes twenty species, including; Image Name Distribution Rhododendron cavaleriei China (Hainan, Guizhou), VietnamRhododendron championiae China (Fujian, Guangdong, Guangxi, Hunan, Jiangxi, Zhejiang) Rhododendron dayaoshanense China (Guangxi) Rhododendron feddei China (Guangxi) Rhododendron hancockii China (Sichuan, Yunnan, Guangxi, Xizang) Rhododendron henryi China (Fujian, Guangdong, Guangxi, Jiangxi, Taiwan, Zhejiang), Taiwan Rhododendron huguangense China (Guangxu, Guangdong, Hunan)Rhododendron latoucheae China, Nansei-shoto to Taiwan Rhododendron longilobum China (Yunnan) Rhododendron mackenzianum China (Xizang, Yunnan), Myanmar Rhododendron mitriforme China (Guangdong, Guangxi, Hunan)Rhododendron moulmainense China (Fujian, Hainan, Hubei, Hunan, Guangdong, Guangxi, Yunnan) India, Indonesia, Malaysia, Myanmar, Thailand Rhododendron stamineum China (Anhui, Guangdong, Guangxi, Guizhou, Hubei, Hunan, Jiangxi, Shanxi, Sichuan, Yunnan, Zhejiang) Rhododendron subestipitatum China (Guangdong) Rhododendron taiense Thailand Rhododendron taishunense China (Zhejiang) Rhododendron truncatovarium China (Yunnan, Guangxi) Rhododendron tutcherae China (Yunnan) Rhododendron vaniotii China (Guizhou) Rhododendron westlandii China (Guizhou)
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