Data from: A note on phytogeography of the flora of Genu and Homag; two mountains with an Irano-Turanian entity in the Saharo-Sindian regional zone, S Iran

The Saharo-Sindian regional zone encompasses the flat and arid areas of North Africa, the Arabian Peninsula, southern Iran and the deserts of Pakistan and W India. There are some scattered mountains situated within this area like Hoggar in Sahara, Saint Catherine in Sinai and Genu and Homag in southern Iran. These highlands serve as interglacial refugia for cold adapted plant species. In the present study, phytogeographical patterns and relationships of the flora of Genu and Homag mountains are assessed and discussed in comparison to the phytogegraphy of the flora of low-lying Hormoz Island. According to chorological assesments of the flora, Genu and Homag mountains belong to theIrano-Turanian region with 59% of the species restricted to this area. However the surrounding lowland plains are part of the Saharo-Sindian area with a rather high proportion of the widespread species (17%) and Somalia-Masai linking elements (20%). It is noteworthy that several Turanian enclaves also occur in the lowland zone. Furthermore, the distributional evidences imply that the mountainous Irano-Turkestanian region is an integrated area which is supposedly distinct from the Turanian lowland areas in the North and the Saharo-Sindian lowland areas in the South. On the other hand, the expansive floras of Turanian and Saharo-Sindian regions are linked to each other. Endemic species in lowland areas in S Iran are mostly either frost sensitive vicariants of cold adapted Turanian species or of Saharo-Sindian origins, while the highland endemics in the area trace their origins to the Irano-turkestanian region.

撒哈拉-信德（Saharo-Sindian）区域带涵盖北非、阿拉伯半岛、伊朗南部以及巴基斯坦与印度西部的干旱平坦区域，区域内分布有零散山地，例如撒哈拉中的霍加尔（Hoggar）山脉、西奈半岛的圣凯瑟琳（Saint Catherine）山，以及伊朗南部的杰努（Genu）与霍马格（Homag）山脉；这些高地是适寒植物物种的冰间期避难所。本研究针对伊朗南部杰努与霍马格山脉的植物区系地理格局及其区系关系展开评估与探讨，并与低海拔霍尔木兹岛的植物区系地理学特征进行对比分析。通过对该区域植物区系的分布学评估可知，杰努与霍马格山脉隶属于伊朗-图兰（Irano-Turanian）区域，其中59%的物种仅分布于此区域；然而其周边的低地平原属于撒哈拉-信德区域，该区域内广布种占比达17%，且包含20%的索马里-马赛（Somalia-Masai）过渡类群，值得注意的是，该低地区域内亦存在多处图兰飞地。进一步的分布证据表明，多山的伊朗-突厥斯坦（Irano-Turkestanian）区域为统一地理单元，其与北部的图兰低地、南部的撒哈拉-信德低地均存在显著差异；另一方面，图兰与撒哈拉-信德两大区域的广袤植物区系之间存在密切关联。伊朗南部低地的特有物种大多为适寒图兰物种的霜敏感替代种，或起源于撒哈拉-信德区域，而该区域内的高地特有种的起源可追溯至伊朗-突厥斯坦区域。