Thank you Izzy for sharing of your experiences with weed killers on this plant. It’s good to know, it will help others to save time and money in combating this insidious weed. Best wishes! Laura

Hi I reasearched the sites that were recommended above to kill this weed and they all indicate it’s tough to do. I tried 3 weed killers: image, weed be gone and roundup. The roundup weed killer (not the total killer) worked. The others had no effect. Thought I’d share.

Link to eradicate creeping spurge/prostrate spurge in lawn. http://ipm.ucanr.edu/PMG/PESTNOTES/pn7445.html

Maybe the Euphorbia sepens (?) In the top photo there are few small white flowers that look similar to E. serpens. According to sources this species is called Matted Sandmatt, Creeping spurge and also shares the common name ‘Prostrate spurge’ with E. prostrata. Click on images from the link below to enlarge. Best wishes! http://www.wildflower.org/gallery/result.php?id_image=31849

Wow! Good shots showing a seed pod or bud plus secondary leaf shapes that have me confused! No problem, I’m accustomed to the condition. Anyway, pinch the stem of the mystery plant and check for a milky sap. That would be common among spurges. Compare to prostrate spurge here: https://courses.missouristate.edu/pbtrewatha/prostrate_spurge.htm