Phylogenetic study of the New Caledonian endemic genus <i>Adenodaphne</i> (Lauraceae) confirms its synonymy with <i>Litsea</i>

The genus Adenodaphne is currently considered endemic to New Caledonia, but its distinction from Litsea is questionable based on morphological similarity. An earlier phylogenetic analysis (ITS) including one species of Adenodaphne and two Asian species of Litsea did support their close relationship but did not permit resolution of their generic boundary. We sampled the four species of Adenodaphne currently recognized (11 accessions) and 11 of the 13 endemic species of Litsea currently recognized, plus one undescribed species (24 accessions in total). Based on our extensive herbarium studies, fieldwork, and especially our molecular phylogenetic analyses (ITS), we conclude that Adenodaphne is not distinct from Litsea and that all species of Adenodaphne should be recognized within Litsea, thereby necessitating the creation of two new species synonymies and one nomen novum. In addition, Litsea paoueensis is here synonymized with L. deplanchei. Finally, our phylogenetic analysis suggests that the sole species of Litsea from New Zealand, which is endemic, results from a rarely documented long-distance dispersal event from New Caledonia.腺药樟属(Adenodaphne)目前被认为是新喀里多尼亚的特有属，但基于形态相似性，其与木姜子属(Litsea)的分类界限仍存在争议。此前一项纳入1个腺药樟属物种与2个亚洲木姜子属物种的系统发育分析（内转录间隔区(ITS)）虽支持二者亲缘关系紧密，却未能明确二者的属级分界。本研究采样了当前公认的4个腺药樟属物种（共计11份凭证标本），以及目前已确认的13个新喀里多尼亚特有木姜子属物种中的11个，外加1个未正式发表的物种，总计24份采样材料。基于广泛的标本馆研究、野外考察，尤其是本次分子系统发育分析（ITS），我们得出结论：腺药樟属并非独立于木姜子属的类群，所有腺药樟属物种均应归入木姜子属，因此需建立2个新的物种异名组合及1个替代学名。此外，本研究将*Litsea paoueensis*异名归并入*L. deplanchei*。最后，本次系统发育分析表明，新西兰特有的唯一木姜子属物种，其起源于一次鲜有记录的、源自新喀里多尼亚的长距离扩散事件。