In the Western States there is a weed that hitched a ride in a shipment of wheat from Australia about 50 years ago that looks and acts almost identical to purselane called "puncture vine". If you step on one of it's seed while barefoot, you will learn the Irish Jig in 2 seconds flat and be a pro dancer and curse like a drunken sailer. If you drive your bike over the plant, you will instantly have a dozen flats . If you walk on them with your tennis shoes, you will have to stop and remove dozens of the spiked bomb seeds from the soles. All in all a very NASTY weed that we always kill , maim and destroy on sight using chemical warfare as pulling or hoeing it is a total waste of time and energy as it regrows from root ends and ever ripening seeds even from the dead plant.