I believe it was Tomcat clover strarting to dry up.
San Diego County, California, US
Withering Tomcat clover—beyond seed?
Trifolium willdenovii, or Tomcat clover, is a species of plant in the pea family Fabaceae. This species occurs in the western part of North America. As an example occurrence, it is found in the California Coast Ranges in such places as Ring Mountain, California, where it is found in association with Cup clover.