I think it might be Sea Purslane but it's rather hard to tell for sure from the picture.
http://www.google.com/imgres?q=seaside+purslane&hl=en&biw=1280&bih=836&tbm=isch&tbnid=OkJIPKBG6lE5aM:&imgrefurl=http://www.enature.com/fieldguides/detail.asp%3FrecNum%3DWF0722&docid=LeTBcI026geKpM&w=273&h=183&ei=6UVxToGzD8K_tge_psn6CQ&zoom=1&iact=rc&dur=574&page=2&tbnh=141&tbnw=173&start=22&ndsp=23&ved=1t:429,r:3,s:22&tx=114&ty=87
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