图3. 西鄂尔多斯地区半日花群落物种的区系地理成分分布。1, 中亚东部成分; 2古地中海成分; 3, 戈壁成分; 4, 戈壁-蒙古成分; 5, 达乌里-蒙古成分; 6, 温带亚洲成分; 7, 哈萨克斯坦-蒙古成分; 8, 黑海-哈萨克斯坦-蒙古成分; 9, 蒙古成分; 10, 世界分布; 11, 东阿拉善-西鄂尔多斯特有种; 12东古北极成分; 13, 泛北极成分; 14, 古北极成分; 15, 旧大陆温带成分; 16, 西鄂尔多斯特有种; 17, 阿拉善-西鄂尔多斯-乌兰察布北部特有种; 18, 贺兰山-阿尔巴斯山特有种; 19, 贺兰山山麓及其南部余脉特有种。

Fig. 3. Floristic geographic distribution of the species in Helianthemum songaricum desert. 1, Central Asia-Eastern Asia element; 2, Palaeo-Mediterranean element; 3, gobi element; 4, gobi-mongolian element; 5, Dawuli-Mongolian element; 6, temperate Asian element; 7, Kazakhstan-Mongolia element; 8, Black Sea-Kazakhstan-Mongolia element; 9, Mongolia element; 10, world distribution; 11, East Alashan-West Ordos endemic species; 12, East Palaeo-North element; 13, Pan-North element; 14, Palaeo-North element; 15, old continent temperate element; 16, west Ordos endemic species; 17, Alashan-Western Ordos-Ulanchabu North endemic species; 18, Helan Mountain-Arbas Mountain endemic species; 19, Helan Mountain and South-Helan Mountain endemic species.