Odontarrhena is a taxonomically difficult genus of the tribe Alysseae, including a number of critical species complexes in the Balkan Peninsula. One of these is O. baldaccii, which was previously included in the inconsistent taxon Alyssum fallacinum but recently shown to be distinct from it. In this paper, we analyzed the still uncertain taxonomic circumscription of O. baldaccii by a comparative analysis of the population from the type locality in Crete and other populations from mainland Greece, which were previously attributed to A. fallacinum or dubitatively included in O. baldaccii s.l. The results supported the separation of these mainland populations in a new distinct species, here described as Odontarrhena stridii, sp. nov. Plant habit, leaf shape and size and silicle shape were the major distinguishing morphological characters. Molecular data also suggested divergence between the two groups of populations, while supporting their phylogenetic affinity. The two species are diploid schizo-endemics with 2n = 16, allopatric distribution and specialization for serpentine soils. Shoot Ni concentrations well above 1000 µg g−1 dry weight were confirmed for the Cretan population of O. baldaccii and found for the first time in two populations of O. stridii, which is therefore a new hyperaccumulating species of the Balkan Mediterranean flora. An updated key to the Greek Odontarrhena taxa is provided.

中文翻译：

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Odontarrhena stridii (Brassicaceae)，一种来自希腊大陆的镍超富集新物种

Odontarrhena 是 Alysseae 部落的一个分类学上困难的属，包括巴尔干半岛的许多关键物种复合体。其中之一是 O. baldaccii，它以前包含在不一致的分类群 Alyssum fallacinum 中，但最近显示与它不同。在本文中，我们通过对来自克里特岛类型地的种群和来自希腊大陆的其他种群的比较分析，分析了 O. baldaccii 仍然不确定的分类范围，这些种群以前被归于 A. fallacinum 或被怀疑地包括在 O. baldaccii sl 结果支持这些大陆种群在一个新的不同物种中的分离，这里描述为 Odontarrhena stridii, sp。十一月 植物习性、叶片形状和大小以及硅片形状是主要的区别形态特征。分子数据还表明两组种群之间存在差异，同时支持它们的系统发育亲和力。这两个物种是二倍体分裂特有的物种，2n = 16，异域分布和专门针对蛇纹石土壤。O. baldaccii 的克里特岛种群的枝条 Ni 浓度远高于 1000 µg-1 干重，并首次在 O. stridii 的两个种群中发现，因此它是巴尔干地中海植物群的一个新的超积累物种。提供了希腊 Odontarrhena 分类群的更新密钥。O. baldaccii 的克里特岛种群的枝条 Ni 浓度远高于 1000 µg-1 干重，并首次在 O. stridii 的两个种群中发现，因此它是巴尔干地中海植物群的一个新的超积累物种。提供了希腊 Odontarrhena 分类群的更新密钥。O. baldaccii 的克里特岛种群的枝条 Ni 浓度远高于 1000 µg-1 干重，并首次在 O. stridii 的两个种群中发现，因此它是巴尔干地中海植物群的一个新的超积累物种。提供了希腊 Odontarrhena 分类群的更新密钥。