Genus Astragalus L. – ancient, heterogeneous, variable in morphology and ecological characteristics, holding the central position in system of family Fabaceae Lindl. Astragalus species play a significant role in vegetation cover and is an important component in structure of the grassland cover of the region. Astragalus L. comprises over 2200 species, distributed worldwide, with exception of Australia [6]. In the local flora it embodies 20 species. Among them, there were identified 11 rare species. The estimation of the threat status of the species for the territory under study is made according to the IUCN Red List Categories and Criteria (2001, 2003) [3, 4]. Astragalus contortuplicatus L. Regionally extinct species – RE. Protected by law in Romania [1]. In the region was known only in the Danube estuary in meadows, wetlands, sandy and salty grounds.  A. corniculatus Bieb. Endangered species – EN (A4ce; B2ab(i,ii,iii,iv); D2). Protected by law in Romania [1]. Species is rarely met in central and southern parts of the region in steppes.  A. dasyanthus Pall. Near Threatened species – NT. This species is protected by law in the Republic of Moldova [5], Romania [1] and Ukraine [7]. The area of distribution is South-Eastern Europe. It occurs in steppe slopes and limestone grounds in all parts of the local flora excluding extreme south. In the region, it is located on the northern limit of its natural area of distribution.  A. dolichophyllus Pall. Regionally extinct species – RE. It is protected by law in Romania [1]. In the region, the species was known in the past only in the southern districts in steppes.  A. exscapus L. Vulnerable species – VU (A4ce; B2ab(i,iii,iv,v); D2). Protected by law in the Ukraine [7]. The species is distributed in Dniester basin and in southern parts of the region on steppe and limestone slopes. In the region, it is located on the northern limit of its natural area of distribution.  A. monspessulanus L. Data Deficient species – DD. It is protected by law in Romania [1]. In the region, it is met only in the north on limestone slopes.  A. pallescens Bieb. Data Deficient species – DD. Protected by law in the Republic of Moldova [5]. Endemic of the southern parts of Eastern Europe. The species is met only in the south of the region, where grows in steppes on loess soil.  A. pastellianus Pollini. Endangered species – EN (A4ce; B2ab(i,ii,iii,iv); D2). Protected by law in the Republic of Moldova [2]. The species is rarely met throughout the region in steppes.  A. ponticus Pall. Vulnerable species – VU (A4acde; B2ab(i,ii,iii,iv); D2). Protected by law in Ukraine [7]. It is met through the region in arid oak forests, on steppe and limestone slopes. In the region, it is located on the northern limit of its natural area. A. pubiflorus DC. Critically Endangered species – CR (A4ace; B2ab(ii,iii,iv). This species is protected by law in the Republic of Moldova [2, 5] and Romania [1]. The species is found only on steppe slopes in the center and south. In the region, it is located on the southern limit of its natural area.  A. subuliformis DC. Data Deficient species – DD. It is protected by law in the Republic of Moldova [5] and Romania [1]. In the region, it is met only in the south on steppe slopes.  A. varius S.G. Gmel. Critically Endangered species – CR (A4ace; B2ab(ii,iii,iv). Protected by law in Romania [1]. It is rarely met in central and southern parts of the region on steppe slopes and sandy terrain along the Black Sea.