Spanish Clover

Spanish clover, Acmispon americanus, is an upright, hairy annual up to 25 mm high with a singular pale pink flower that is only 6 mm in size! Its other common name is American bird's-foot trefoil. The plant is a species of legume native to most  of California, Western US, Western Canada and Mexico. I found this lonely singular flower along a quiet road in Santa Cruz Mountains.