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黔中杜鹃(Rhododendron feddei)属于杜鹃花科(Ericaceae)杜鹃属(Rhododendron)马银花亚属(Rhododendron subg. Azaleastrum)长蕊杜鹃组(Rhododendron sect. Choniastrum)的种类[1],特产于贵州,因叶背面中脉中下部有星散的硬刚毛而与马银花亚属的其他种明显区别,对马银花亚属的分类有重要意义;该种虽然在1913年就已经发表,但是在《贵州植物志》3卷(1986)和《中国植物志》57卷(2)(1994)中都没有收录,只在《FOC》14卷[2]中有记录,却缺乏花器官的描述;2019年5月20日和2019年6月5日在贵定平伐海拔1 330 m和雷公山主峰山腰海拔1500 m采集到黔中杜鹃标本。贵定平伐为单株分布,雷公山为群落分布,分布面积约200 m2,共计12株。近年来,偶有杜鹃属植物新纪录种的补充描述,如早春杜鹃(2)。但有关黔中杜鹃的研究没有报道,只有记录在1903年6月18日在贵州贵定平伐采集到标本并有少部分特征描述[3]。本文针对该种杜鹃的花部形态及叶形大小等特征进行补充描述。
Supplementary Description of Rhododendron feddei in Guizhou
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摘要: 该文对黔中杜鹃花部形态和叶形大小进行了补充描述。花常5朵簇生枝顶,花萼退化至一波状凸缘,无毛,花冠漏斗形,5深裂,花冠管筒状,长约1.2 cm,向基部渐狭;雄蕊10,细长,伸出花冠约2倍长,花丝无毛。该种与长蕊杜鹃相近,因叶背中脉有硬刚毛而易于区分。该研究结果为该种进一步分类修订提供了有价值的信息。Abstract: In this paper, the floral morphology and leaf size of Rhododendron feddei were described and supplemented. Inflorescence subapical, usually 5-flowered; calyx reduced to an undulate rim, glabrous; corolla funnelform 5, corolla tube cylindrical; tube ca. 1.2 cm, tapering narrow toward base; tamens 10, slender, exserted twice longer than corolla, filaments glabrous. This species was similar to Rhododendron stamineum, but it was easily distinguished due to the stiff bristles in midvein of the leaf back midrib. This paper provided some valuable information for further taxonomic revision of Rhododendron species.
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Key words:
- Rhododendron feddei;
- Supplementary description;
- Guizhou
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[1] WU ZY, Raven, et al, 2005. Flora Reipublicae Popularis Sinicae(English Revise Edition)[M]. 北京: 中国科学出版社, 14: 472. [2] XIANG Jian-Feng, YU Xun-Lin, LUO Kai-Wen. A newly recorded species and its supplementary description of Ericaceae from Hunan[J]. 广西植物, 2017, 37(8): 989−992. [3] Friedricb Fedde, 1913. Repertorium specierum novarum regni vegetabilis[M]. Berlin. COMMISSIONS. VERLAG VON GEBRUDER BORNTRAEGER, 12: 102.
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