Astragalus sinuatus is an endemic species which has an extremely small range (EOO = 25 kmÂ²) and for which much of the habitat within its historic range has been converted or significantly degraded by agriculture, grazing and gravel pits. There is still quite a bit of suitable habitat remaining, but the species does not seem to be able to spread in those areas and the causes are not fully understood at present. There are also ongoing threats to the species and the habitat such as fire suppression, non-native species invasions, grazing, and agricultural development. There is also a lack of comprehensive data on populations trends. This is clearly a species of conservation concern and is therefore proposed its listing is upgraded from Endangered to Critically Endangered.