(Rumex scutatus) aka French sorrel
http://en.wikipedia.org/wiki/Rumex
http://www.herbs2000.com/herbs/herbs_sorrel_french.htm
http://www.daleysfruit.com.au/Perennialveg/frenchsorrel.htm
http://www.global-garden.com.au/gardenherbs2.htm#French%20Sorrel
http://www.****.com/how_2104051_grow-french-sorrel.html
main domain is ehow dot com, apparently on WP's spam blacklist.