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It's called Oxalis stricta, or Common Woodsorrel.

This nasty invader is hard to control.  It may take a few seasons to see results.  I have seen over the last  couple of months in areas of my garden that have gotten new plantings and regular water. 

This is the best time to start getting rid of it.  You want to do this before the Oxalis goes to seed. By spring getting rid of is is much more difficult.

Here are some methods for getting rid of it. 

Diligent and thorough weeding
That means digging deeply enough to get at the stem and root.  Some people state that repeated removal below the point of leaf attachment this time of year can eventually kill it. 

Sheet mulching
Cardboard and newspaper (6-10 sheets thick) is also recommended.  This material is effective at blocking light and suppressing the weeds.  Then put mulch over the material.

Solarization
If the above two don't work experts suggest trying this.  You need to wait till the sunniest time of the year.  The idea is to encourage as many sees/bulbs to germinate and start to grow.  Then add fertilizer and water; cover the entire area securely with clear plastic to bake them out of existence.  This takes one to two months.  You could, to be on the safe side, do sheet mulching on top of that.

A note about herbicides and chemical solutions:  Roundup has gotten mixed reviews as to its effectiveness.  There is also a products called Oxalis X.  The ingredient is Ammonium Thiosulfate. We don't have any reviews on this product, however.