Taxonomic studies in Wedelia (Asteraceae, Heliantheae) reveal a new species for the Brazilian Cerrado

IF 17.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-05-09 DOI:10.11646/phytotaxa.647.2.4

J. B. DE A. BRINGEL JR., Maria Alves, Nádia Roque

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Abstract

Wedelia is the largest genus of Ecliptinae (Heliantheae, Asteraceae), comprising about 110 species. The Brazilian Cerrado is a highly threatened phytogeographic domain, which harbors the richest flora in the world among other savannas. A new subshrubby species of Wedelia was revealed occurring in the central part of Cerrado and is herein described as W. tenuinervia. This new species resembles W. foliacea in vegetative traits but differs mainly by having leaves with brochidodromous venation, pistillate ray flowers, glandular trichomes on the abaxial surface of the leaf blade, corolla lobes and apical anther appendages, phyllaries abaxial surface strigillose and disc cypselae 4–5-angled, keeled at the angles, without basal scars or elaiosomes, and carpopodium inconspicuous (vs. acrodromous venation, neuter ray flower, abaxial surface of the leaf blade, corolla lobes and apical anther appendage lacking glandular trichomes, phyllaries abaxial surface setose or glabrescent, and disc cypselae biconvex, not keeled, with basal scars or elaiosomes, and carpopodium in two plates or one shallowly lobed). Among the species with pistillate ray flowers, W. tenuinervia can be morphologically related to W. oligocephala, differing mainly by the membranaceous leaf blades with flat margins, brochidodromous venation, and solitary capitula (vs. subcoriaceous leaf blades with revolute margins, acrodromous venation and capitula in dichasia). Illustrations, comments, a preliminary conservation status, and the typification of W. foliacea’s synonyms are proposed.

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蟛蜞菊（菊科，Heliantheae）的分类研究揭示了巴西塞拉多地区的一个新物种

蟛蜞菊（Wedelia）是菊科蟛蜞菊属（Heliantheae，Asteraceae）中最大的一个属，约有 110 个种。巴西的塞拉多（Cerrado）是一个受到高度威胁的植物地理区域，在世界其他热带稀树草原中拥有最丰富的植物群。tenuinervia。foliacea 相似，但其主要区别在于叶片有帚状脉纹、雌蕊射线花、叶片背面有腺毛、花冠裂片和顶端花药附属物、叶片背面具短糙伏毛，花盘苞片呈 4-5 角形，在角上呈龙骨状，无基部疤痕或elaiosomes，瓣基不明显（vs.腋生脉序，中性射线花，叶片背面、花冠裂片和顶端花药附属物缺乏腺毛，叶片背面具刚毛或后脱落，花盘辐状聚伞花序双凸面，不具龙骨状棱角，有基部痕或elaiosomes，瓣基为两片或一片浅裂）。在具有雌蕊射线花的物种中，W. tenuinervia 与 W. oligocephala 在形态上有亲缘关系，主要区别在于膜质叶片边缘平整，具帚状脉纹和单生头状花序（而二歧叶近角质叶片边缘外卷，具刺状脉纹和头状花序）。提出了 W. foliacea 的异名的插图、评论、初步保护状况和类型。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.