Astragalus arenarius

The somewhat recumbent A. arenarius has slender branched stems from 10 to 40 cm long, and typically reaches 30 cm tall. It can be distinguished from its congeners by its having leaflets grouped in 2 to 6 pairs, 2 to 4 mm wide by 10 to 20 mm long; calyces that are characterized by having mostly strongly asymmetric bifurcate hairs; a standard (the large posterior petal seen in legume flowers) 15 to 17 mm long; and legumes that 12 to 20 mm long.^[2] Its petals range in color from light purple to lilac, and rarely can be white. The flowering time is from June to July.

As the specific name implies it grows in sandy or gravelly areas, in places that have limited competition from grasses, such as sandy open pine woodlands, dunes, river banks, roadsides and railway embankments. The larvae of the moth species Coleophora gallipennella, C. onobrychiella, C. polonicella and Syncopacma albifrontella feed on A. arenarius.