1.) Astragalus fruticosus Forssk. is a valid yellow flowering species of section Chronopus:

https://www.inaturalist.org/taxa/1570326-Chronopus

https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:477515-1

https://astragalusofworld.com/astragalus-fruticosus/

https://redlist.parks.org.il/plants/detail/Astragalus%20fruticosus/

https://flora.org.il/plants/ASTFRU/

Astragalus fruticosus is also a synonym of two different purple flowering species in section Dissitiflori:

https://www.inaturalist.org/taxa/1532117-Dissitiflori

2.) Astragalus fruticosus Ledeb. is a synonym of Astragalus cornutus Pall.: https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:477514-1

3.) Astragalus syriacus and Astragalus syrcus are two orthographical variants of one and the same species. The distribution maps of POWO and Astragalus of World are different which makes it difficult to atlas the species correctly:

Astragalus syriacus L., Sp. Pl.: 759 (1753): https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:480093-1

Astragalus syrcus L., Sp. Pl.: 759 (1753): https://astragalusofworld.com/astragalus-syrcus/

The name Astragalus suffruticosus DC. is another synonym for this species:

https://www.plantarium.ru/page/view/item/5661.html

The distribution area is larger than that stated by Astragalus of World but smaller than that stated by POWO. The distribution area almost certainly extends into Russia, but I don't have any precise distribution data and have limited my mapping to the only reliable distribution data from Astragalus of World SE Asia (Mongolia). Unfortunately, the other parts of SE Asia that may be part of the distribution area are not specified, but most of the observations on iNaturalist come from Mongolia anyway.

4.) Astragalus fruticosus Steud. is a synonym of Corethrodendron fruticosum var. fruticosum

I have not included this species in the split. This plant obviously does not belong to the genus Astragalus. The distribution area partially overlaps with Astragalus syriacus L. and I dont want that the observations drop down to Faboideae.

However, I entered the name as a synonym for Corethrodendron fruticosum var. fruticosum.

The few observations on iNaturalist as "Astragalus fruticosus" probably all belong to Astragalus syriacus L. (syn. Astragalus syrcus L., syn. Astragalus suffruticosus DC.) due to its distribution area.