Page 162 - 《广西植物》2026年第9期
P. 162
1 5 9 8 广 西 植 物 46 卷
( 1. Research Institute of Tropical Forestryꎬ Chinese Academy of Forestryꎬ Guangzhou 510520ꎬ Chinaꎻ 2. Administrative
Office of Wengyuan Qingyunshan Provincial Nature Reserveꎬ Shaoguan 512600ꎬ Guangdongꎬ China )
Abstract: Opithandra B. L. Burttꎬ an artificial genus established on the basis of a single morphological characterꎬ
namely having two fertile posticous stamensꎬ was merged into Oreocharis Benth. In this studyꎬ we observed a plant
species (Oreocharis sp.) which is similar to Oreocharis burttii ( W. T. Wang) Mich. Möller & A. Weber in the
Qingyunshan Nature Reserve of Shaoguanꎬ Guangdongꎬ Chinaꎬ but it exhibits variable numbers of fertile stamens. To
clarify the taxonomic identity of this unusual population and to evaluate whether it should be treated as conspecific with
O. burttiiꎬ we performed species delimitation on this population using both morphological comparisons and phylogenetic
analyses. The results are as follows: (1) Both morphological and molecular data support that the unidentified species
discovered in Qingyunshan Nature Reserve is O. burttii. It is highly consistent with O. burttii in core diagnostic
charactersꎬ including the morphological characteristics of leaves and flowers. On the molecular phylogenetic treeꎬ its
sample clusters into one clade together with the two samples of O. burttii. (2) The population discovered in Qingyunshan
Nature Reserve differs from the protologue in the sizes of several morphological traits. Compared to the original
descriptionꎬ individuals in this population possess longer petioles (5.7-13.5 cm vs. 0.5-5.4 cm)ꎬ wider leaf blades
(4.6-5.4 cm vs. 1.7-4.0 cm)ꎬ cymes with longer peduncles (5-12 cm vs. 2-6 cm)ꎬ larger calyxes (ca. 5 mm × 2 mm
vs. 3.5-3.8 mm × ca. 1 mm) and larger corolla tubes (ca. 15 mm × 7 mm vs. 10-14 mm × ca. 3.5 mm). (3) The
population discovered in Qingyunshan Nature Reserve differs from the protologue in quantity of the cyme branch ordersꎬ
number of flowers and number of fertile stamens. Specificallyꎬ it has more orders of cyme branches (2-3 vs. 1-2)ꎬ more
flowers (5-14 vs. 2-7)ꎬ and a variable number of fertile stamens [in 20 individuals: 1 (5%ꎬ rare)ꎻ 2 (70%)ꎻ 3
(12.5%)ꎻ 4 (12.5%)] vs. 2. In conclusionꎬ this study provides a supplementary morphological description for O.
burttii. These findings expand the known range of morphological variation for this speciesꎬ contribute to a more
comprehensive understanding of its intraspecific morphological variationꎬ provide essential foundational data for future
accurate identification and taxonomic revision.
Key words: Oreocharisꎬ Opithandraꎬ Oreocharis burttiiꎬ intraspecific morphological variationꎬ supplementary
description of morphology
苦苣苔科( Gesneriaceae) 为草本、灌木或罕有 苔属( Tremacron Craib) 被并入马铃苣苔属( Möller
乔木组成的植物类群ꎬ全球约含 160 属 3 500 余种 et al.ꎬ 2011)ꎮ 其中ꎬ后蕊苣苔属以其 2 枚可育雄
( 数 据 来 自 多 识 植 物 百 科ꎬ https: / / duocet. 蕊的 特 征 区 别 于 狭 义 马 铃 苣 苔 属ꎬ 但 是 Burtt
ibiodiversity.netꎬ访问时间为 2026 年 1 月 26 日)ꎬ (1958)指出ꎬ后蕊苣苔属是一个略显( somewhat)
广泛分布于非洲、中南美洲、东亚与南亚、南欧及 基于人为主观而建立的属ꎮ 目前ꎬ广义马铃苣苔
大洋 洲 ( Weber et al.ꎬ 2013)ꎮ 狭 义 马 铃 苣 苔 属 属已包含 160 个物种(数据来自 GRCꎬGesneriaceae
(Oreocharis Benth. s.str.) 建立后ꎬ在早期的分类学 Resource Centreꎬ https: / / padme. rbge. org. uk / grc / ꎬ
研究中ꎬ 根 据 Wang 等 ( 1998)、 李 振 宇 和 王 印 政 访问时间为 2025 年 12 月 23 日)ꎬ仅次于报春苣
(2004)的记录ꎬ该属约 29 种ꎬ其中 28 种、5 变种分 苔属(Primulina Hance) ( Xu et al.ꎬ 2021)ꎬ是中国
布于中国ꎮ 基于广泛的分子系统学与形态学研 苦苣苔科植物中的第二大属ꎬ近年来一直是苦苣
究ꎬ后蕊苣苔属(Opithandra B. L. Burtt)、直瓣苣苔 苔科研 究 人 员 的 关 注 焦 点 ( Kong et al.ꎬ 2022ꎻ
属 ( Ancylostemon Craib )、 四 数 苣 苔 属 ( Bournea Xiong et al.ꎬ 2025ꎻ谭珂等ꎬ2025)ꎮ
Oliver)、粗筒苣苔属( Briggsia Craib s.str.)、瑶山苣 广义马铃苣苔属在早期经历了快速的辐射进
苔 属 ( Dayaoshania W. T. Wang )、 全 唇 苣 苔 属 化ꎬ其在营养生长习性和果实特征方面几乎没有
(Deinocheilos W. T. Wang)、金盏苣苔属( Isometrum 差异ꎻ然而其花冠形状、颜色与雄蕊可育数量方面
Craib)、弥勒苣苔属( Paraisometrum W. T. Wang)、 存在显著差异( 韦毅刚ꎬ2010ꎻMöller et al.ꎬ 2011ꎻ
辐花苣苔属( Thamnocharis W. T. Wang) 与短檐苣 Kong et al.ꎬ 2022)ꎮ 金璇等( 2021) 研究表明ꎬ广

