Data from: Integrated molecular and morphological studies of the Daucus guttatus complex (Apiaceae)

In a previous study using 94 nuclear orthologs, we reported the species status of the Daucus guttatus complex to be unresolved, partitioned into three clades. In the present study, a subset of ten of these 94 orthologs was used to infer the phylogeny of the D. guttatus complex and related species. A near parallel set of accessions, planted in a common garden, was used for morphological analyses. The molecular trees are highly resolved for most of the clades, grouping accessions of the D. guttatus complex into four clades. Bayesian concordance analysis and a coalescent approach gave slightly different topologies. Morphological data likewise support four taxa in the complex. Moreover, herbarium research from a companion study informs nomenclature for taxa of the complex. We identify these four clades as D. bicolor, D. conchitae, D. guttatus, and D. setulosus; internested in or among these segregates are the phenetically distinctive species D. glochidiatus, D. involucratus, D. littoralis, and D. pusillus. Our research redefines species variation in the D. guttatus complex, clarifies species names, interspecific relationships, confirms a useful subset of nuclear orthologs for studies of dominant topologies of Daucus, and discovers morphological characters allowing proper identification of the four species of the D. guttatus complex and related species.本团队此前一项基于94个核直系同源基因（nuclear orthologs）的研究显示，胡萝卜属斑点胡萝卜复合群（Daucus guttatus complex）的物种界定尚未明确，该复合群被划分为3个演化支（clade）。本研究选取上述94个核直系同源基因中的10个子集，用于解析该复合群及其近缘物种的系统发育关系。我们选取了一组与分子实验近乎平行的种质材料（accession），将其种植于同质种植园后开展形态学分析。分子系统树对绝大多数演化支的解析度极高，将该复合群的种质材料划分为4个演化支。贝叶斯一致性分析（Bayesian concordance analysis）与溯祖分析方法（coalescent approach）得到的拓扑结构存在细微差异。形态学数据同样支持该复合群内存在4个分类群（taxon）。此外，一项配套研究中的标本馆（herbarium）调研结果可为该复合群分类群的命名提供依据。本研究将这4个演化支界定为D. bicolor、D. conchitae、D. guttatus以及D. setulosus；表型特征显著的D. glochidiatus、D. involucratus、D. littoralis与D. pusillus物种，嵌套于上述分化类群之中或其间。本研究重新界定了胡萝卜属斑点胡萝卜复合群内的物种变异范围，厘清了物种命名与种间关系，验证了一套可用于解析胡萝卜属（Daucus）优势拓扑结构的核直系同源基因子集，并发现了可用于准确鉴定该复合群4个物种及其近缘物种的形态学特征。