Quercus zhekunii, a new sclerophyllous oak from Guangxi, southwest China

Asian (sub)tropical karst regions harbor high endemism and species diversity of sclerophyllous oaks. In this study, Quercus zhekunii, a new species from Guangxi, China, is described and illustrated. Phylogenomic reconstruction using RAD-seq placed this new species within the “Tropical Clade” of Quercus sect. Ilex. The dense fused fasciculate and uniserate trichomes on the leaf abaxial surface of Q. zhekunii resemble those of Q. kingiana. However, its distinctively concave primary and lateral veins on the leaf adaxial surface, along with the prominent backward-recurved leaf blade and leaf margin, make it morphologically distinct from any known species in Q. sect. Ilex. The conservation status of Q. zhekunii is assessed as Endangered (EN). A new identification key to the species in the “Tropical Clade” is provided. In addition, character evolution and phylogeography of the “Tropical Clade” of Q. sect. Ilex is briefly discussed based on the new phylogenetic and morpho-anatomical data., , , # Quercus zhekunii, a new sclerophyllous oak from Guangxi, southwest China

[https://doi.org/10.5061/dryad.7sqv9s527](https://doi.org/10.5061/dryad.7sqv9s527)

## Description of the data and file structure

This datasets include the sequence matrix, SNP data, and tree files for Quercus section ilex, as well as for Clade III with the section.

### Files and variables

#### File: sectIlex.zip

**Description:** The zip file contains five matrices, SNP data, and tree files derived from 29 samples of Quercus section Ilex and three outgroup species.

#### File: clade3.zip

**Description:** The zip file contains five matrices, SNP data, and tree files derived from 24 individuals of Quercus section Ilex Clade III and one outgroup species.

亚洲（亚）热带喀斯特区域孕育了高度特有性与丰富的硬叶栎类物种多样性。本研究对采自中国广西的新物种浙坤栎（Quercus zhekunii）进行了形态描述与图解。本研究利用限制性位点关联DNA测序（RAD-seq）开展系统基因组学重建，结果显示该新物种隶属于冬青栎组（Quercus sect. Ilex）的热带演化支（Tropical Clade）。浙坤栎叶背表面具密集的连合簇生单列毛状体，该特征与国王栎（Q. kingiana）相似；但其叶近轴面明显凹陷的主侧脉，连同显著向后反曲的叶片与叶缘，使其在形态上显著区别于冬青栎组已知的所有物种。浙坤栎的濒危等级被评估为濒危（EN）。本研究同时提供了热带演化支类群的全新分种检索表。此外，本研究基于新获得的系统发育与形态解剖学数据，对冬青栎组热带演化支的性状演化与系统地理学进行了简要讨论。

# 浙坤栎：中国西南广西的新硬叶栎物种

https://doi.org/10.5061/dryad.7sqv9s527

## 数据集与文件结构说明

本数据集包含冬青栎组类群以及该组内演化支III的序列矩阵、单核苷酸多态性（SNP）数据与系统发育树文件。

### 文件与变量

#### 文件：sectIlex.zip

**描述：** 该压缩包包含源自29份冬青栎组样本与3份外类群样本的5个矩阵、SNP数据及系统发育树文件。

#### 文件：clade3.zip

**描述：** 该压缩包包含源自24份冬青栎组演化支III个体与1份外类群样本的5个矩阵、SNP数据及系统发育树文件。