Morphometric analysis of the Daphne kiusiana complex (Thymelaeaceae) using digitized herbarium specimens

IF 0.8 Q4 PLANT SCIENCES KOREAN JOURNAL OF PLANT TAXONOMY Pub Date : 2022-09-30 DOI:10.11110/kjpt.2022.52.3.144
Yoon-Su Kim, Sang-Hun Oh
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Abstract

Daphne kiusiana is an evergreen shrub with dense head-like umbels of white flowers distributed in southern Korea, Japan, China, and Taiwan. Plants in China and Taiwan are recognized as var. atrocaulis by having a dark purple stem, elliptic leaves, and persistent bracts. Recently, plants on Jejudo Island were segregated as a separate species, D. jejudoensis, given their elliptic leaves with an acuminate apex, a long hypanthium and sepals, and a glabrous hypanthium. Morphological variations of three closely related taxa, the D. kiusiana complex, were investigated across the distributional range to clarify the taxonomic delimitation of members of the complex. Twelve characters of the leaf and flower were measured from digitized herbarium specimens using the image analysis program ImageJ and were included in a morphometric analysis, the results of which indicate that the level of variation in the characters is very high. The results of a principal component analysis weakly separated D. jejudoensis from D. kiusiana according to their floral characteristics, such as a longer, glabrous hypanthium, and larger sepals. However, some individuals of D. kiusiana, particularly those from Bigeumdo Island, were included in D. jejudoensis. Recognition of D. kiusiana var. atrocaulis based on the leaf shape was not supported in the analysis, and D. jejudoensis may be recognized as a variety of D. kiusiana. Our morphometric analysis shows that digitized images of herbarium specimens could be useful and an additional method by which to investigate more diverse specimens.
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利用数字化植物标本对金瑞香复合体(百里香科)的形态计量学分析
水仙花是一种常绿灌木,有密集的白色伞状花序,分布于韩国南部、日本、中国和台湾。中国和台湾的植物因具有深紫色的茎、椭圆形的叶和持久的苞片而被公认为变种。最近,Jejudo岛上的植物被分离为一个单独的物种,D.jejudoensis,因为它们的椭圆形叶具有渐尖的先端、长的托杯和萼片,以及无毛的托杯。研究了三个亲缘关系密切的分类群,即基乌西纳D.kiusiana复合体,在整个分布范围内的形态变异,以澄清复合体成员的分类界限。使用图像分析程序ImageJ从数字化植物标本馆标本中测量了叶片和花朵的12个性状,并将其纳入形态计量分析,结果表明这些性状的变异水平非常高。主成分分析的结果根据D.jejudoensis和D.kiusiana的花特征,如较长、无毛的托杯和较大的萼片,将它们弱分离。然而,基乌西纳D.kiusiana的一些个体,特别是来自比根都岛的个体,被包括在杰朱多恩D.jejudoensis中。在分析中,不支持基于叶片形状对D.kiusianavar.atrocaulis的识别,而D.jejudoensis可能被识别为D.kiusiana的一个变种。我们的形态计量学分析表明,植物标本馆标本的数字化图像可能是有用的,也是研究更多样化标本的一种额外方法。
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来源期刊
KOREAN JOURNAL OF PLANT TAXONOMY
KOREAN JOURNAL OF PLANT TAXONOMY Agricultural and Biological Sciences-Plant Science
CiteScore
1.50
自引率
40.00%
发文量
23
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