A new species of the Marlierea group (Myrcia sect. Aulomyrcia, Myrtaceae) from the cacao region of Bahia, Brazil

IF 0.9 4区生物学 Q4 PLANT SCIENCES

Kew Bulletin Pub Date : 2024-01-19 DOI:10.1007/s12225-023-10155-3

Paulo Henrique Gaem, Eve Lucas, Fiorella Fernanda Mazine, Maria do Carmo Estanislau do Amaral

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Abstract

A new species of the Marlierea group of Myrcia sect. Aulomyrcia (Myrtaceae) is described and illustrated. Myrcia bahiensis Gaem & Mazine can be distinguished from all its congeners by large leaf blades bearing longitudinal, curved marks that indicate a plicate ptyxis, in combination with glabrous inflorescences, inconspicuous bracts, large flower buds, and a ‘hyper-hypanthium’ floral developmental pathway. Within the Marlierea group, vegetative morphological traits of Myrcia bahiensis most resemble those of Myrcia sucrei, whereas its reproductive organ morphology recalls M. neoregeliana. However, M. sucrei has densely tomentose inflorescences and showy bracts while M. neoregeliana has smaller leaves without longitudinal marks, indicating a planate ptyxis. Myrcia bahiensis is known from only one collection made in the cacao region of southern Bahia, Brazil. Due to a lack of reliable geographical distribution information, the new taxon is provisionally assessed as Data Deficient according to the IUCN criteria. An identification key for all species of the Marlierea group occurring in the Atlantic Forest of Bahia state is provided.

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巴西巴伊亚州可可地区的 Marlierea 群（Myrcia 科 Aulomyrcia 属，桃金娘科）新种

描述并说明了桃金娘科（Myrtaceae）Marlierea 属的一个新种。Aulomyrcia（桃金娘科）中的一个新种。Myrcia bahiensis Gaem & Mazine 与其所有同属植物的区别在于其叶片较大，叶片上有纵向的弯曲痕迹，表明其为折扇状腋生，同时还具有无毛花序、不明显的苞片、大花芽以及 "超半托花序 "的花发育途径。在 Marlierea 群中，Myrcia bahiensis 的无性系形态特征与 Myrcia sucrei 最为相似，而其生殖器官形态则与 M. neoregeliana 相似。不过，M. sucrei 的花序密被绒毛，苞片艳丽，而 M. neoregeliana 的叶片较小，没有纵向痕迹，表明其为平面腋生。Myrcia bahiensis 仅从巴西巴伊亚州南部可可地区的一次采集中得知。由于缺乏可靠的地理分布信息，根据世界自然保护联盟（IUCN）的标准，该新分类群暂定为数据不足类。本报告提供了巴伊亚州大西洋森林中出现的马利埃拉类所有物种的识别钥匙。

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来源期刊

Kew Bulletin PLANT SCIENCES-

CiteScore

1.70

自引率

22.20%

发文量

期刊介绍： Kew Bulletin is an international peer-reviewed journal for the taxonomy, systematics and conservation of vascular plants and fungi. Papers on conservation, evolution, palynology, cytology, anatomy, biogeography and phytochemistry are considered, where relevant to taxonomy and systematics. Review papers on topics appropriate to the journal are invited. The journal is richly illustrated with line drawings and photographs, and also features a Book Review and Notices section. Four parts (c. 640 pp) are published each year.