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Rhododendron tianmenshanense C. L. Peng & L. H. Yan, a new species of (Ericaceae) from Hunan, China

中国湖南杜鹃花科鹃花属一新种——天门山杜鹃


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全 文 :植 物 分 类 学 报 45 (3): 304–306(2007) doi:10.1360/aps06095
Acta Phytotaxonomica Sinica http://www.plantsystematics.com
———————————
2006-06-19收稿, 2007-02-02收修改稿。
基金项目: 湖南省自然科学基金项目(9807)(Supported by the Natural Science Foundation of Hunan Province, Grant No.
9807)。
* 通讯作者(Author for correspondence. E-mail: pengchunliang128@263.net; Tel.: 13507479263)。
中国湖南杜鹃花科杜鹃花属一新种——天门山杜鹃
1彭春良* 2,1颜立红 3黄宏全 1康用权
1(湖南省森林植物园 长沙 410116)
2(中南林业科技大学 长沙 410004)
3(天门山国家森林公园 湖南张家界 427000)
Rhododendron tianmenshanense C. L. Peng & L. H. Yan,
a new species of Ericaceae from Hunan, China
1PENG Chun-Liang* 2,1YAN Li-Hong 3HUANG Hong-Quan 1KANG Yong-Quan
1(Hunan Forest Botanical Garden, Changsha 410116, China)
2(Central South University of Forestry & Technology, Changsha 410004, China)
3(Tianmenshan National Forest Park, Zhangjiajie 427000, Hunan)
Abstract A new species of the Ericaceae, Rhododendron tianmenshanense C. L. Peng & L.
H. Yan, which was found to grow in forest in Zhangjiajie City, Hunan Province, China, was
described and illustrated. The new species is similar to R. aganniphum Blaf. f. & K. Ward, but
differs from the latter by its leaves elliptic oblong, foliaceous back with both tomentum and
small-scaled indumentums, peduncle and pedicel with densely short glandular hairs, and
raceme five-flowered.
Key words Rhododendron, Rhododendron tianmenshanense C. L. Peng & L. H. Yan,
Ericaceae, new species, Hunan, China.
摘要 报道了中国湖南天门山国家森林公园内发现的杜鹃花科Ericaceae杜鹃花属Rhododendron一新种
——天门山杜鹃R. tianmenshanense C. L. Peng & L. H. Yan。该种与雪山杜鹃R. aganniphum Balf. f. & K.
Ward近似, 但以叶为长圆状椭圆形, 叶背具两层毛被, 上层为银白色短绒毛, 下层为紧贴的鳞片状细
毛, 总花梗和花梗具密而短的腺毛, 花常5朵组成总状花序而不同。该种隶属常绿杜鹃组大理杜鹃亚组
sect. Ponticum subsect. Talienisa。
关键词 杜鹃花属; 天门山杜鹃; 杜鹃花科; 新种; 湖南; 中国
2006年春, 作者在湖南省张家界市天门山国家森林公园植物考察中, 在海拔约1400
m的常绿落叶阔叶林中采集到一物种。该物种为小乔木, 林下更新良好, 一株成年植株下
可见数十株小苗。该种4月中下旬开花, 花白色至淡红色, 常5朵成总状花序生于枝顶。
经研究, 该种为杜鹃花属Rhododendron L.常绿杜鹃组大理杜鹃亚组sect. Ponticum G. Don
subsect. Talienisa (Tagg) Sleumer一新种。
天门山杜鹃 新种 图1
Rhododendron tianmenshanense C. L. Peng & L. H. Yan, sp. nov. Fig. 1
(subgen. Hymenanthes (Bl.) K. Koch sect. Ponticum G. Don subsect. Talienisa (Tagg)
3期 彭春良等: 中国湖南杜鹃花科杜鹃花属一新种——天门山杜鹃

305
Sleumer)
Species proxima R. agannipho Balf. f. & K. Ward, sed foliis oblongo-ellipticis, subtus
venutinis et lepidotis, inflorescentiis racemosis paucifloris, saepe 5-floris, pedicillis
glanduloso-pubescentibus differt.
Frutex vel arbuscula, sempervirens, 2–4 m alta; ramuli hornotini flavo-brunnei,
glabrescentes, annotini 5 mm diam. Folia coriacea, persistentia, oblongo- elliptica, 4.8–6.2 cm
longa, 1.8–2.5 cm lata, apice abrupte acuta, basi late cuneata, margine integra, recurvata, supra
atroviridia, subtus argenteo-venutina et adpresse lepidota, margine paulo revolute, costa media
supra impressa, subtus elevata, nervis lateralibus utrinsecus 21–25 supra leviter depressis
subtus obscuris; petioli 1.0–1.5 cm longi. Inflorescentia breviter racemosa, terminalis, saepe
5-flora; pedunculus 2.0–3.0 mm longus, dense breviter flavo-glanduloso-pubescens; pedicelli
1.2–1.8 cm longi, dense breviter flavo-glanduloso-pubescentes; calyx cyathiformis, circ. 2 mm
longus, 5-lobatus, lobis ovatis, glanduloso-pubescentibus; corolla infundibuliformi-
campanulata, 2.8–3.2 cm longa, alba vel rubella, intus purpureo-rubro-maculata in parte
superiore et basi puberula, 5-lobata, lobis subrotundatis 1.2–3.0 cm longis et 1.5–1.7 cm latis
apice emarginatis; stamina 10, inaequalia, 1.0–2.1 cm longa, filamentis albis ad basin



图1 天门山杜鹃 A, 花枝; B, 叶下毛被; C, 花冠。(黄文韬根据彭春良和黄宏全20060008号标本绘)
Fig. 1. Rhododendron tianmenshanense C. L. Peng & L. H. Yan. A, flowering branch; B, indumentums under leaves;
C, corolla. Drawn by W. T. Huang from C. L. Peng & H. Q. Huang 20060008, HFBG.
植 物 分 类 学 报 45卷

306
albo-puberulis, antheris anguste ellipticis circ. 1.5 mm longis fulvis; pistillum corollae
subaequilogum, ovario ovoideo-conico 3–4 mm longo dense glanduloso-puberulo, stylo 2.6
cm longo glabro haud exserto, stigmate capitato. Capsula oblongo-cylindrica, circ. 2 cm longa
et 5 mm diam., ovoideus Fl. Apr. –Mai. Fr. Aug.–Sept.
China. Hunan (湖南): Zhangjiajie (张家界), Tianmen Shan (天门山), alt. 1400 m, in
forest, 2006-04-25, C. L. Peng & H. Q. Huang (彭春良, 黄宏全) 20060008 (holotype, HFBG
(湖南省森林植物园标本室)).
常绿灌木至小乔木, 高2–4 m; 当年生小枝黄褐色, 无毛, 小枝直径5 mm。叶革质,
长圆状椭圆形, 长4.8–6.2 cm, 宽1.8–2.5 cm, 先端急尖, 基部宽楔形, 边缘全缘, 反卷,
上面暗绿色, 无毛, 微有皱纹, 下面具毛被2层, 上层薄海绵状, 银白色, 下层紧贴叶片,
中脉在上面凹入, 在下面突起, 侧脉9–11对, 在上面凹入, 在下面隐藏在毛被内; 叶柄长
1.5 cm, 无毛。顶生短总状花序, 花常5朵, 花序总梗长2–3 mm, 密被黄色短腺毛, 花梗长
1.2–1.8 cm, 密被黄色短腺毛; 花萼小, 杯状, 长约2 mm, 5裂, 裂片卵形, 被腺毛; 花冠
漏斗状钟形, 长2.8–3.2 cm, 白色或淡红色, 内部上方具紫红色斑点, 内面基部具微毛,
裂片5, 近圆形, 长1.2–3.0 cm, 宽1.5–1.7 cm, 顶端微缺; 雄蕊10枚, 不等长, 长1.0–2.1
cm, 花丝白色, 基部被白色微柔毛, 花药狭椭圆形, 黄褐色, 长约1.5 mm; 雌蕊与花冠近
等长, 子房卵球状, 圆锥形, 长3–4 mm, 密被短腺毛, 花柱长2.6 cm, 无毛, 不伸出花冠,
柱头头状, 膨大, 黄绿色。蒴果圆柱状, 长约2 cm, 直径约5 mm。花期4–5月, 果期8–9月。
本种与雪山杜鹃R. aganniphum Balf. f. & K. Ward近似, 不同之处是本种叶长圆状椭
圆形, 下面有银白色短绒毛被层及紧贴的鳞片状细毛, 总状花序具少数花, 常5朵, 花梗
具腺毛, 而相区别。
致谢 四川联合大学何明友教授审定新种, 中国科学院植物研究所王文采院士对拉丁文
作了大量修改,中南林业科技大学祁承经教授指导拉丁文描述,黄文韬先生为新种作图,
谨致谢忱。