映山红亚属

映山红亚属，直立灌木或有时较高，枝和小枝被红棕色扁平糙伏毛、腺头刚毛、长柔毛，稀无毛。叶脱落至半宿存或宿存，常被糙伏毛或粱毛，无鳞片。

伞形花序顶生，有花1--数朵(花序与叶枝出自同一个顶芽)；花萼通常小；花冠漏斗形或辐状钟形或钟状漏斗形，白色至玫瑰色，紫红色或红色，常具斑点，但不具黄色或橙黄色斑点，有明显的花冠管，裂片5，无毛，稀具腺毛；雄蕊5—10，稀达12，等长或不等长，花丝被柔毛或无毛；子房5室，常被刚毛、柔毛或腺毛，从不具鳞片。蒴shuò果卵球形、圆锥形或圆锥状卵球形，常具沟糟，被糙伏毛、长柔毛或近于无毛。

皋月杜鹃R．Indicum(Linn.)Sweet Sleumer in Engler's Bot．Jahrb．74：551．1949．

将本亚属分为2组，主要分布于中国西南、华南、华中、华东，直达日本和朝鲜，向南伸展到中南半岛和菲律宾。全世界约90种，中国72种6变种。

组种轮生叶组Sect. Brachycalyx Sweet丁香杜鹃Rhododendron farrerae Tate ex Sweet满山红Rhododendron mariesii Hemsl. et Wils.大字杜鹃Rhododendron schlippenbachii Maxim.假映山红组Sect. Tsusiopsis Sleumer大武杜鹃Rhododendron tashiroi Maxim.映山红组Sect. Tsutsusi Sweet腺花杜鹃Rhododendron adenanthum M. Y. He大关杜鹃Rhododendron atrovirens Franch.短鳞芽杜鹃 Rhododendron breviperulatum Hayata金萼杜鹃Rhododendron chrysocalyx Levl. et Vant.龙山杜鹃Rhododendron chunii Fang棒柱杜鹃Rhododendron crassimedium Tam粗柱杜鹃Rhododendron crassistylum M. Y. He白枝杜鹃Rhododendron cretaceum Tam龙岩杜鹃Rhododendron florulentum Tam子花杜鹃Rhododendron flosulum Fang et G. Z. Li河边杜鹃Rhododendron flumineum Fang et M. Y. He贵定杜鹃Rhododendron fuchsiifolium Lévl.棕毛杜鹃Rhododendron fuscipilum M. Y. He腺柱杜鹃Rhododendron glandulostylum Fang et M. Y. He海南杜鹃Rhododendron hainanense Merr.合江杜鹃Rhododendron hejiangense M. Y. He湖南杜鹃Rhododendron huanense Chun ex Tam背绒杜鹃Rhododendron hypoblematosum Tam皋月杜鹃Rhododendron indicum (L.) Sweet素馨杜鹃Rhododendron jasminoides M. Y. He金平杜鹃Rhododendron jinpingense Fang et M. Y. He金秀杜鹃Rhododendron jinxiuense Fang et M. Y. He台北杜鹃Rhododendron kanehirai Wils.广西杜鹃Rhododendron kwangsiense Hu ex Tam广东杜鹃Rhododendron kwangtungense Merr. et Chun毛花柱杜鹃Rhododendron lasiostylum Hayata荔叶杜鹃Rhododendron litchiifolium T. C. Wu et Tam长尖杜鹃Rhododendron longifalcatum Tam长鳞芽杜鹃Rhododendron longiperulatum Hayata忍冬杜鹃Rhododendron loniceraeflorum Tam麻栗坡杜鹃Rhododendron malipoense M. Y. He岭南杜鹃Rhododendron mariae Hance南边杜鹃Rhododendron meridionale Tam亮毛杜鹃Rhododendron microphyton Franch.小花杜鹃Rhododendron minutiflorum Hu白花杜鹃Rhododendron mucronatum (Blume) G. Don铁仔叶杜鹃Rhododendron myrsinifolium Ching ex Fang ex M. Y. He南昆杜鹃Rhododendron naamkwanense Merr.那克哈杜鹃Rhododendron nakaharai Hayata南平杜鹃Rhododendron nanpingense Tam钝叶杜鹃Rhododendron obtusum (Lindl.) Planch.八蕊杜鹃Rhododendron octandrum M. Y. He砖红杜鹃Rhododendron oldhamii Maxim.千针叶杜鹃Rhododendron polyraphidoideum Tam美艳杜鹃Rhododendron pulchroides Chun et Fang锦绣杜鹃Rhododendron pulchrum Sweet黔阳杜鹃Rhododendron qianyangense M. Y. He淡红杜鹃Rhododendron rhodanthum M. Y. He乳源杜鹃Rhododendron rhuyuenense Chun ex Tam溪畔杜鹃Rhododendron rivulare Hand.-Mazz.台红毛杜鹃Rhododendron rubropilosum Hayata滇红毛杜鹃Rhododendron rufohirtum Hand.-Mazz.茶绒杜鹃Rhododendron rufulum Tam崖壁杜鹃Rhododendron saxatile B. Y. Ding et Y. Y. Fang毛果杜鹃Rhododendron seniavinii Maxim.杜鹃Rhododendron simsii Planch.蔗黄杜鹃Rhododendron spadiceum Tam川南杜鹃Rhododendron sparsifolium Fang腊黄杜鹃Rhododendron subcerinum Tam隐脉杜鹃Rhododendron subenerve Tam涧上杜鹃Rhododendron subflummineum Tam大埔杜鹃Rhododendron taipaoense T. C. Wu et Tam细瘦杜鹃Rhododendron tenue Ching ex Fang et M. Y. He薄片杜鹃Rhododendron tenuilaminare Tam鼎湖杜鹃Rhododendron tingwuense Tam两广杜鹃Rhododendron tsoi Merr.垂钩杜鹃Rhododendron unciferum Tam粘质杜鹃Rhododendron viscidum C. Z. Guo et Z. H. Liu粘芽杜鹃Rhododendron viscigemmatum Tam阳明山杜鹃Rhododendron yangmingshanense Tam瑶山杜鹃Rhododendron yaoshanicum Fang et M. Y. He