Purple wood-sorrel

In my back yard on September 8th I found this little purple wood-sorrel flower (Oxalis drummondii). When I say little I mean maybe five-eighths of an inch (15mm) across.

(Yesterday at Muir Woods National Monument in California I saw plenty of redwood sorrel (Oxalis oregana), though none of it was flowering.)

© 2016 Steven Schwartzman