was Unknown Oxalis, now Oxalis purpurea
Mary Sue Ittner via pbs (Fri, 11 Feb 2022 14:06:01 PST)

I agree that this looks like Oxalis purpurea. There probably are forms
that aren't aggressive, but my experience in coastal Northern California
has found it to spread rapidly and even tiny ones have more tiny ones on
the stolons if you don't get pull them out quickly. I grow a couple of
nice forms in pots and on nice days before the soil gets to dry to dig,
task myself to dig up a 100 of various sizes. I don't  have gophers, but
some years I find new patches of Oxalis purpurea where it didn't grow
before. My garden has a lot of trees and shade so I get mostly leaves. 
Diana Chapman once remarked this would make a nice lawn and that is
probably true if you didn't want anything else and wanted green for many
months of the years and the knowledge that if it dies back in summer it
would come back when it started to rain again.
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