Camissonia brevipes (Gray) Raven.
Engl.: golden suncup, yellow cups, golden evening primrose.
Flowering plant. Bow Willow, CA, US. Wild. 1998-03-01.
Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.
Plant Healer Magazine: Very relevant to the practitioner.
http://www.henriettes-herb.com - Copyright 1995–2016 Henriette Kress.