ABSTRACT

As presently delimited, the endemic New Zealand species Senecio glaucophyllus Cheeseman shows considerable morphological and ecological diversity. Two morphologically similar forms associated with this taxon are found in northwest Nelson (South Island), of which one is often filed in herbaria as S. glaucophyllus subsp. glaucophyllus. The other form has been informally recognised as S. aff. glaucophyllus. The present study aimed to determine if S. aff. glaucophyllus merits taxonomic recognition by assessing if it is morphologically and genetically distinct from S. glaucophyllus subsp. glaucophyllus and, if so, to identify its diagnostic morphological characters. The results of Principal Coordinate Analyses of a morphometric data set and phylogenetic studies of an ITS DNA sequence data set show that the two taxa are morphologically and genetically distinct and only distantly related to each other. Random Forest analyses resulted in the discovery of several morphological characters that can be used to distinguish the taxa. The inclusion of data of type specimens of S. glaucophyllus in the PCoAs showed that specimens of S. aff. glaucophyllus are conspecific with S. glaucophyllus whereas most of S. glaucophyllus in its current delimitation belong to a taxon that is unnamed at the species level. We here provide a new name at species rank for this taxon: Senecio matatini. This taxonomic realignment reinstates Cheeseman’s original concept of S. glaucophyllus as a species that is restricted to northwest Nelson. Senecio matatini has a much wider distribution and is found throughout much of the South Island and the southern and central parts of the North Island. Because our results indicate that S. glaucophyllus subsp. basinudus, S. glaucophyllus subsp. discoideus, and S. glaucophyllus subsp. toa are currently best considered as subspecies of S. matatini, new combinations for these three taxa are also provided. In addition, we lectotypify the name Senecio lautus var. montanus Cheeseman.

摘要

按照目前的定界，新西兰特有的千里光绿叶芝士干酪显示出相当大的形态和生态多样性。在西北纳尔逊（南岛）发现了与该分类单元相关的两种形态相似的形式，其中一种通常在青草中作为青枯菌亚种存在。青绿叶。另一种形式被非正式地认可为S. aff。青绿叶。针对目前的研究，以确定是否S. AFF。青光眼通过评估其在形态和遗传上是否与青光眼亚种亚种不同，值得分类学上的认可。青光眼如果是，则确定其诊断形态特征。形态数据集的主坐标分析结果和ITS DNA序列数据集的系统发育研究结果表明，这两个分类单元在形态和遗传上是不同的，并且彼此之间只有很远的距离。随机森林分析导致发现了几个可用于区分分类群的形态特征。的类型试样的数据列入S. glaucophyllus在PCoAs显示的那个试样S. AFF。青光眼与青光眼链球菌是同种的，而大多数青光眼链球菌当前分类中的一个分类单元在物种级别未命名。我们在此提供此分类单元物种排名的新名称：Senecio matatini。这种分类学上的调整恢复了芝士曼最初将青叶葡萄球菌（S. glaucophyllus）视为仅限于西北尼尔森的物种的概念。千里光（Senecio matatini）的分布范围更广，遍及南岛的大部分地区以及北岛的南部和中部地区。因为我们的结果表明S. glaucophyllus亚种。basinudus，S. glaucophyllus亚种。Discoideus和S. glaucophyllus亚种。大阿目前最好被认为是S. matatini的亚种，还提供了这三个分类群的新组合。此外，我们将Senecio lautus var命名为典型。蒙塔努斯·吉士曼。