Rhododendron carneum Hutch.
20171483 Cultivated material
20181526 Cultivated material
20210531 Uncertain
Rhododendron carrii Sleumer
19761950 Wild collected in Papua New Guinea
Rhododendron carringtoniae F.Muell.
19741502 Wild collected in Papua New Guinea
Rhododendron carstensense Wernham
20101880 Wild collected in Indonesia
Rhododendron catacosmum Balf.f. ex Tagg
19614560 Cultivated from material wild collected in China
19698450 Cultivated material
20120866 Cultivated material
20221027 Cultivated material
20231775 Cultivated material
20232346 Cultivated material
Rhododendron catawbiense Michx.
19340114 Wild collected in United States of America
19800046 Wild collected in United States of America
19810634 Wild collected in United States of America
19903013 Wild collected in United States of America
20101071 Wild collected in United States of America
20101119 Wild collected in United States of America
20101127 Wild collected in United States of America
Rhododendron catawbiense Michx. [hybrid]
19795476 Cultivated material
Rhododendron catawbiense × arboreum Michx.
19971496 Uncertain
Rhododendron caucasicum Pall.
19521068 Wild collected in Türkiye (Turkey)
19812116 Wild collected in Russian Federation
19981931 Wild collected in Georgia
20030853 Wild collected in Georgia
20052353 Wild collected in Türkiye (Turkey)
20052359 Wild collected in Türkiye (Turkey)
20081528 Wild collected in Türkiye (Turkey)
20081543 Wild collected in Türkiye (Turkey)
20101346 Wild collected in Georgia
20131326 Wild collected in Russian Federation
20131327 Wild collected in Russian Federation
Rhododendron celebicum (Blume) DC.
19981606 Wild collected in Indonesia
19981633 Wild collected in Indonesia
20000542 Wild collected in Indonesia
20000559 Wild collected in Indonesia
20000568 Wild collected in Indonesia
20000589 Wild collected in Indonesia
20000590 Wild collected in Indonesia
20000623 Wild collected in Indonesia
20000668 Wild collected in Indonesia
20000671 Wild collected in Indonesia
20000696 Wild collected in Indonesia