映山紅組

多枝的灌木或矮灌木，小枝密被紅棕色扁平糙伏毛，或疏被長柔毛、開展的剛毛和腺 毛。葉脫落至半常綠或 常綠，中等大小，常密被棕褐色扁平糙伏毛，稀近於無毛。傘形花序頂生，有花1至數朵與葉枝出自同一個頂芽；花冠漏斗形或漏斗狀鐘形，紅色至紫紅 色，粉紅色或白色，花冠管圓筒狀，外面無毛，稀具腺毛，裂片5，通常外面無毛；雄蕊 5—10，稀達12，等長或不等長，花絲中部以下被柔毛或微柔毛，稀無毛；子房5室，被 糙伏毛，有時具腺毛。蒴果圓錐形或圓錐狀卵球形，被糙伏毛或近於無毛。

本組的模式種：皋月杜鵑R. indicum (Linn.) Sweet

本組全世界共80餘種。分佈於亞洲東部；從朝鮮、日本中部以及我國東南部(少數 達西部)。越南、菲律賓有少數種。我國有71種6變種，土產於我國東南至西南部。

觀賞，花冠漏斗形或漏斗狀鐘形，紅色至紫紅 色，粉紅色或白色，花冠管圓筒狀。

1.腺花杜鵑Rhododendron adenanthum M. Y. He

2.大關杜鵑Rhododendron atrovirens Franch.

3.短鱗芽杜鵑Rhododendron breviperulatum Hayata

4.金萼杜鵑Rhododendron chrysocalyx H. Lév. & Vant. 金萼杜鵑（原變種）Rhododendron chrysocalyx H. Lév. & Vant. var. chrysocalyx 秀山金萼杜鵑（變種）Rhododendron chrysocalyx H. Lév. & Vant. var. xiushanense (Fang) M. Y. He

5.龍山杜鵑Rhododendron chunii Fang

6.棒柱杜鵑Rhododendron crassimedium P. C. Tam

7.粗柱杜鵑Rhododendron crassistylum M. Y. He

8.白枝杜鵑Rhododendron cretaceum P. C. Tam

9.龍岩杜鵑Rhododendron florulentum P. C. Tam

10.子花杜鵑Rhododendron flosculum Fang & G. Z. Li

11.河邊杜鵑Rhododendron flumineum Fang & M. Y. He

12.貴定杜鵑Rhododendron fuchsiifolium H. Lév.

13.棕毛杜鵑Rhododendron fuscipilum M. Y. He

14.腺柱杜鵑Rhododendron glandulostylum Fang & M. Y. He

15.海南杜鵑Rhododendron hainanense Merr.

16.合江杜鵑Rhododendron hejiangense M. Y. He

17.湖南杜鵑Rhododendron hunanense Chun ex P. C. Tam

18.背絨杜鵑Rhododendron hypoblematosum P. C. Tam

19.皋月杜鵑Rhododendron indicum (L.) Sweet

20.素馨杜鵑Rhododendron jasminoides M. Y. He

21.金平杜鵑Rhododendron jinpingense Fang & M. Y. He

22.金秀杜鵑Rhododendron jinxiuense Fang & M. Y. He

23.台北杜鵑Rhododendron kanehirae E. H. Wils.

24.廣西杜鵑Rhododendron kwangsiense Hu ex P. C. Tam 廣西杜鵑〔原變種）Rhododendron kwangsiense Hu ex P. C. Tam var. kwangsiense 鈍圓杜鵑（變種）Rhododendron kwangsiense Hu ex P. C. Tam var. obovatifolium P. C. Tam

25.廣東杜鵑Rhododendron kwangtungense Merr. & Chun

26.毛花柱杜鵑Rhododendron lasiostylum Hayata

27.荔葉杜鵑Rhododendron litchiifolium T. C. Wu & P. C. Tam

28.長尖杜鵑Rhododendron longifalcatum P. C. Tam

29.長鱗芽杜鵑Rhododendron longiperulatum Hayata

30.忍冬杜鵑Rhododendron loniceriflorum P. C. Tam

31.麻栗坡杜鵑Rhododendron malipoense M. Y. He

32.嶺南杜鵑Rhododendron mariae Hance

33.南邊杜鵑Rhododendron meridionale P. C. Tam 南邊杜鵑（原變種）Rhododendron meridionale P. C. Tam var. meridionale 狹葉南邊杜鵑（變種）Rhododendron meridionale P. C. Tam var. minus P. C. Tam 糙柱杜鵑（變種）Rhododendron meridionale P. C. Tam var. setistylum P. C. Tam

34.亮毛杜鵑Rhododendron microphyton Franch. 亮毛杜鵑（原變種）Rhododendron microphyton Franch. var. microphyton 碧江亮毛杜鵑（變種）Rhododendron microphyton Franch. var. trichanthum A. L. Chang ex R. C. Fang

35.小花杜鵑Rhododendron minutiflorum Hu

36.白花杜鵑Rhododendron mucronatum (Bl.) G. Don

37.鐵仔葉杜鵑Rhododendron myrsinifolium Ching ex Fang & M. Y. He

38.南昆杜鵑Rhododendron naamkwanense Merr. 南昆杜鵑（原變種）Rhododendron naamkwanense Merr. var. naamkwanense、紫薇春（變種）Rhododendron naamkwanense Merr. var. cryptonerve P. C. Tam

39.那克哈杜鵑Rhododendron nakaharae Hayata

40.南平杜鵑Rhododendron nanpingense P. C. Tam

41.鈍葉杜鵑Rhododendron obtusum (Lindl.) Planch.

42.八蕊杜鵑Rhododendron octandrum M. Y. He

43.磚紅杜鵑Rhododendron oldhamii Maxim.

44.千針葉杜鵑Rhododendron polyraphidoideum P. C. Tam 嶺上杜鵑（變種）Rhododendron polyraphidoideum P. C. Tam var. montanum P. C. Tam 千針葉杜鵑（原變種）Rhododendron polyraphidoideum P. C. Tam var. polyraphidoideum

45.美艷杜鵑Rhododendron pulchroides Chun & Fang

46.錦繡杜鵑Rhododendron pulchrum Sweet

47.黔陽杜鵑Rhododendron qianyangense M. Y. He

48.淡紅杜鵑Rhododendron rhodanthum M. Y. He

49.乳源杜鵑Rhododendron rhuyuenense Chun ex P. C. Tam

50.溪畔杜鵑Rhododendron rivulare Hand.-Mazz.

51.台紅毛杜鵑Rhododendron rubropilosum Hayata

52.滇紅毛杜鵑Rhododendron rufohirtum Hand.-Mazz.

53.茶絨杜鵑Rhododendron rufulum P. C. Tam

54.崖壁杜鵑Rhododendron saxatile B. Y. Ding & Y. Y. Fang

55.毛果杜鵑Rhododendron seniavinii Maxim.

56.杜鵑Rhododendron simsii Planch.

57.蔗黃杜鵑Rhododendron spadiceum P. C. Tam

58.川南杜鵑Rhododendron sparsifolium Fang

59.臘黃杜鵑Rhododendron subcerinum P. C. Tam

60.隱脈杜鵑Rhododendron subenerve P. C. Tam

61.澗上杜鵑Rhododendron subflumineum P. C. Tam

62.大埔杜鵑Rhododendron taipaoense T. C. Wu & P. C. Tam

63.細瘦杜鵑Rhododendron tenue Ching ex Fang & M. Y. He

64.薄片杜鵑Rhododendron tenuilaminare P. C. Tam

65.鼎湖杜鵑Rhododendron tingwuense P. C. Tam

66.兩廣杜鵑Rhododendron tsoi Merr.

67.垂鉤杜鵑Rhododendron unciferum P. C. Tam

68.粘質杜鵑Rhododendron viscidum C. Z. Guo & Z. H. Liu

69.粘芽杜鵑Rhododendron viscigemmatum P. C. Tam

70.陽明山杜鵑Rhododendron yangmingshanense P. C. Tam

71.瑤山杜鵑Rhododendron yaoshanicum Fang & M. Y. He