Here you can clearly see the difference between native 'akulikuli, Sesuvium portulacastrum, and pickleweed. The 'akulikuli's in the foreground, and forms a dense, compact carpet. The pickleweed in the background grows more upright. It's not apparent in this picture, but when you're there you can see a distinct difference in the shades of green. Pickleweed's green is a touch more yellow.