Data_and_scripts_Notelaea

Tackling the complicated infrafamilial classification of the economically important Oleaceae requires a piecemeal approach that addresses generic circumscriptions. Here, focusing on the distinct clade formed by the generic complex Nestegis, Notelaea, Osmanthus, Phillyrea, and Picconia within the subtribe Oleinae, we aim to elucidate their boundaries and relationships and to evaluate their biogeographic history in light of their peculiar disjunct distribution in Macaronesia, the Mediterranean Region, and the Pacific. Based on phylogenomic data from plastid and nuclear DNA and extensive sampling, the results show six subclades within this generic complex, which are also geographic segregates found in Australia (Notelaea), Hawaiian Islands (Nestegis sandwicensis), Macaronesia (Picconia), Mediterranean Region (Phillyrea), New Caledonia (Osmanthus section Notosmanthus), and New Zealand (Nestegis s.s.). Accounting for broad morphological overlaps within this clade, we recognize three genera (Phillyrea, Picconia, and Notelaea s.l.), subsuming all Pacific taxa under Notelaea s.l. Molecular dating and biogeographic analyses indicate that this clade originated in Eurasia during the Early Miocene (ca. 23 Mya) and that dispersal only can be favored to explain its global disjunct distribution. Although the colonization route to the Hawaiian Islands is unclear, island-hopping and local extinction seem to be the hallmark of the evolutionary history of this group.针对具有经济重要性的木犀科（Oleaceae）复杂的科下分类问题，需采用分阶段研究策略以解决属级界定难题。本研究聚焦于木犀亚族（Oleinae）中由Nestegis、Notelaea、Osmanthus、Phillyrea及Picconia属复合体所构成的独特演化支，旨在阐明该类群的分类界限与系统发育关系，并结合其在马卡罗尼西亚群岛、地中海区域及太平洋的特殊间断分布格局，解析其生物地理演化历史。基于质体DNA与核DNA的系统发育基因组学数据及广泛的类群采样，本研究结果显示该属复合体包含6个亚支系，且这些亚支系对应不同地理分布的类群：澳大利亚的诺德木属（Notelaea）、夏威夷群岛的Nestegis sandwicensis、马卡罗尼西亚群岛的Picconia、地中海区域的Phillyrea、新喀里多尼亚的 Osmanthus 组Notosmanthus以及新西兰的狭义Nestegis（Nestegis s.s.）。考虑到该演化支内广泛存在的形态重叠现象，本研究认可3个属的分类地位：Phillyrea、Picconia及广义诺德木属（Notelaea s.l.），并将所有太平洋类群归入广义诺德木属。分子定年与生物地理分析表明，该演化支起源于早中新世（约2300万年前）的欧亚大陆，其全球间断分布格局仅可通过长距离扩散事件予以解释。尽管抵达夏威夷群岛的殖民路径尚不明确，但岛屿跳跃扩散与局部灭绝似乎是该类群演化历史的典型特征。