The sweet tabaiba (Euphorbia balsamifera Ait.) is one of the classical examples of the disjunct biogeographic pattern known as Rand Flora. This species is currently circumscribed to comprise two subspecies, Euphorbia balsamifera subsp. balsamifera and E. balsamifera subsp. adenensis (Deflers) P.R.O. Bally, with their respective areas of distribution separated by a gap of about 2000 km across Central-East Africa. We use multiple sources of evidence including phylogenomics, morphometrics, lineage ages, and climatic niche analysis to disentangle the confusing taxonomy around this charismatic Euphorbia lineage. Based on our integrative approach, we reestablish the two current subspecies to the rank of species (E. balsamifera Ait., E. adenensis Deflers) and resurrect the long forgotten E. sepium N.E. Br., a commonly used species in the western Sub-Saharan and Sahelian regions. The taxonomic treatment presented here includes an identification key, updated morphological descriptions, and lectotypification of several names.

中文翻译：

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不止一种甜蜜的油烟：解开多汁树状灌木 Euphorbia balsamifera 的系统学

甜的 tabaiba ( Euphorbia balsamifera Ait.) 是被称为兰德植物群的分离生物地理模式的经典例子之一。该物种目前被限制为包括两个亚种，即Euphorbia balsamifera subsp。balsamifera和E. balsamifera subsp。adenensis (Deflers) PRO Bally，它们各自的分布区域在非洲中东部相距约 2000 公里。我们使用多种证据来源，包括系统基因组学、形态测量学、谱系年龄和气候生态位分析，以解开围绕这种具有魅力的大戟属植物的令人困惑的分类学血统。基于我们的综合方法，我们将当前的两个亚种重新建立到物种等级（E. balsamifera Ait., E. adenensis Deflers），并复活了早已被遗忘的E. sepium NE Br.，这是西部亚种常用的物种。撒哈拉和萨赫勒地区。此处介绍的分类处理包括识别密钥、更新的形态描述和几个名称的选型。