Rhamnella intermedia, a new evergreen species from southwest Guangxi, is described and illustrated in this study. This species is similar to R. brachycarpa by the size and ratio of length to width of dried fruit and seeds, by which it differs from R. rubrinervis and R. tonkinensis. However, it differs from R. brachycarpa by rarely mucronate seed apices, larger ratio of length to width of leaves, leaf apices acuminate to long acuminate, shorter leaf petioles, and longer fruiting pedicels. Principal component analysis based on phenotypic traits further recognised three separated groups. Rhamnella rubrinervis and R. tonkinensis were clustered into one group; the other two groups represented R. brachycarpa and two Guangxi populations, respectively. Furthermore, phylogenetic analysis of nuclear ITS sequence variations highly supported that the two Guangxi populations represented an independent evolutionary lineage and were closest to R. rubrinervis. Four fixed nucleotide sites were found and were different from R. rubrinervis. However, besides the differentiated traits in seeds and fruit, densely pilose young branches also separated them from R. rubrinervis. In addition, during our field investigations, none of the three closely related species were found at locations where this new species was distributed. Therefore, this new species, based on the two Guangxi populations, is named R. intermedia. The key to four closely related species is also presented.

中文翻译：

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来自广西南部的一种新的常绿树种Rhamnella intermedia（Rhamnaceae）

在这项研究中描述并举例说明了中间的鼠李糖（Rhamnella intermedia），这是一种来自广西西南部的常绿新种。该物种在干果和种子的大小和长度与宽度的比例上与短果罗汉果相似，区别于罗汉果罗汉果和顿金罗汉果。但是，它与短果罗非鱼的区别在于：很少见到尖尖的种子尖尖，叶的长与宽之比更大，叶尖渐长至长尖，叶柄短，果梗长。基于表型特征的主成分分析进一步识别了三个分离的组。风疹沙门氏菌（Rhamnella rubrinervis）和唐纳什乳杆菌（R. tonkinensis）分为一组。另外两个群体分别代表腕果木和两个广西种群。此外，核ITS序列变异的系统进化分析高度支持，这两个广西种群代表一个独立的进化谱系，并且最接近红树林。发现了四个固定的核苷酸位点，它们与红红霉菌不同。然而，除了种子和果实具有不同的性状外，茂密的柔毛幼枝也将它们与红毛猩猩分开。此外，在我们的实地调查中，在该新物种分布的地点未发现这三个紧密相关的物种。因此，基于广西的两个种群，这种新物种被命名为中间媒介R. intermedia。还介绍了四个密切相关物种的关键。发现了四个固定的核苷酸位点，它们与红红霉菌不同。但是，除了种子和果实具有不同的性状外，茂密的柔毛幼枝也将它们与红毛猩猩分开。此外，在我们的实地调查中，在该新物种分布的地点未发现这三个紧密相关的物种。因此，基于广西的两个种群，这种新物种被命名为中间媒介R. intermedia。还介绍了四个密切相关物种的关键。发现了四个固定的核苷酸位点，它们与红红霉菌不同。但是，除了种子和果实具有不同的性状外，茂密的柔毛幼枝也将它们与R. rubrinervis分开。此外，在我们的实地调查中，在该新物种分布的地点未发现这三个紧密相关的物种。因此，基于广西的两个种群，这种新物种被命名为中间媒介R. intermedia。还介绍了四个密切相关物种的关键。基于广西的两个种群，被命名为中间媒介。还介绍了四个密切相关物种的关键。基于广西的两个种群，被命名为中间媒介。还介绍了四个密切相关物种的关键。