At first glance, Crownvetch
might appear to be an Astragalus sp.. Close examination, however, reveals
that the flowers are arranged in an umbel, radiating from a single central point.
Sepals are glabrous (hairless), while most Astragalus sp. have hairy
sepals. Leaflets often have a pointed tip. The keel (inner petals of the flower)
has a purple tip.