Systematics of Oxalis subg. Thamnoxys (Endl.) Reiche sect. Holophyllum Progel (Oxalidales, Oxalidaceae)

Oxalis sect. Holophyllum (Oxalidaceae) is a small group of species that are endemic to the Brazilian Atlantic Forest in the states of Rio de Janeiro, Minas Gerais, Espírito Santo, and Bahia. Species of the section can be recognized by the unifoliolate leaves, one-seeded carpels, and the common presence of dorsiventrally flattened (and sometimes winged) peduncles and/or petioles. Circumscriptions of the currently accepted species needed to be revaluated, as the overlap in several features have blurred limits among morphologically similar taxa. In this study we evaluate the monophyly and phylogenetic relationships among species of O. sect. Holophyllum, and provide an updated taxonomic study of the section, aiming at improving species circumscriptions and facilitating species-level identification. For this task, we analyzed samples from herbaria and carried out fieldwork to observe the plants in loco, collect samples, and gather material for DNA extraction, amplification, and sequencing. B..., , , Data from: Systematics of Oxalis subg. Thamoxys (Endl.) Reiche sect. Holophyllum Progel (Oxalidales, Oxalidaceae); Fiaschi et al. (2024)

Data are organized by:

Alignment in fasta format: alignment matrix with concatenated data from ITS, petA-psbJ and trnL-trnF used to infer phylogenetic relationships of Oxalis.

Trees in newick format: Phylogenetic trees from Maximum Likelihood and Bayesian analysis based on the concatenated matrix.

酢浆草属（Oxalis）全缘组（sect. Holophyllum，Oxalidaceae）是一个小型物种类群，特有分布于巴西大西洋森林的里约热内卢州、米纳斯吉拉斯州、圣埃斯皮里图州及巴伊亚州。该组物种可通过以下特征识别：单小叶、具单粒种子的心皮，以及普遍存在的背腹扁平（有时具翅）的花序梗和/或叶柄。当前所接受的物种界定亟待重新评估，因多个特征的重叠模糊了形态相似类群间的分类界限。本研究对全缘组物种的单系性及系统发育关系进行评估，并提供该组的更新分类学研究，旨在完善物种界定并助力物种水平的鉴定。为完成此项研究，我们分析了标本馆馆藏样本，并开展野外调查以原位观察植株、采集样本及获取用于DNA提取、扩增和测序的实验材料。[原文此处内容未完整呈现]，数据来源：《酢浆草亚属Thamoxys (Endl.) Reiche 组Holophyllum Progel的系统学研究》（酢浆草目，Oxalidales；酢浆草科，Oxalidaceae）；Fiaschi 等（2024）

数据组织形式如下：
1. 快速比对格式（fasta）联配矩阵：包含来自ITS、petA-psbJ及trnL-trnF的联合序列数据，用于推断酢浆草属的系统发育关系。
2. 新克格式（newick）系统发育树文件：基于上述联合比对矩阵，通过最大似然法（Maximum Likelihood）和贝叶斯分析（Bayesian analysis）得到的系统发育树。