Knowledge of species richness and distribution of African biodiversity comes primarily from fauna studies, despite the tremendous richness of the flora. The genus Euphorbia (Euphorbiaceae) is one of the most diverse plant genera, and shows a great diversity across Africa. This genus is the largest endemic plant radiation in Angola, including 82 native species with a large diversity of life forms (e.g. herbs, shrubs and trees, and several succulent species) 61% of which are endemics. Considering the great diversity of species, habitats and climatic conditions of Angola, this study aims to: (i) update the inventory of the Euphorbia in this country; (ii) investigate the distribution of these species in the Köppen–Geiger climatic regions, WWF ecoregions, and within the protected areas network; and (iii) use these new findings to devise future conservation programs to protect Angola’s high plant diversity. Our results revealed that there are 49 endemic Euphorbia species (54 endemic taxa) in Angola, most of which occur in the extensive Miombo woodlands, although some species are restricted to the arid zones of southern Angola. The representation of Euphorbia endemics in protected areas was low, with Iona National Park and the Partial Reserve of Namibe showing the best potential for species protection. Centres of diversity and endemism were found in Serra da Chela (Huíla province) and the Angolan Kaokoveld Desert (Namibe province) and must be considered of conservation importance. A re-evaluation of Angola’s protected areas network might be required to facilitate and promote effective conservation of the unique plant diversity of the country.

中文翻译：

---

安哥拉最大植物辐射的物种丰富度和分布：大戟科（Euphorbiaceae）

尽管植物区系非常丰富，但非洲生物多样性的物种丰富度和分布知识主要来自动物研究。属大戟（大戟科）是最多样的植物属中的一个，并显示一条穿越非洲的巨大差异。该属是安哥拉最大的地方性植物辐射，包括82种具有多种生命形式的本地物种（例如草药，灌木和树木以及几种多肉植物），其中61％是地方性物种。考虑到安哥拉的物种，栖息地和气候条件的多样性，本研究旨在：（i）更新大戟属的清单。在这个国家; （ii）调查这些物种在科本-盖格气候区，世界自然基金会生态区和保护区网络内的分布；（iii）利用这些新发现来制定未来的保护计划，以保护安哥拉的高植物多样性。我们的研究结果表明，安哥拉有49种特有的大戟属物种（54种特有的生物分类群），尽管其中有些物种仅限于安哥拉南部的干旱地区，但大多数都发生在广阔的Miombo林地。一品红的代表保护区的地方性流行很低，爱奥那国家公园和纳米贝部分保护区显示出最佳的物种保护潜力。在塞拉达切拉（韦拉省）和安哥拉高科维尔德沙漠（纳米贝省）发现了多样性和地方性中心，必须将其视为具有保护意义。可能需要对安哥拉的保护区网络进行重新评估，以促进和促进对该国独特植物多样性的有效保护。