That is another one all together. It spreads but usually not as intensely as O. debilis. I have seen it listed as ***Oxalis articulata<http://florida.plantatlas.usf.edu/Plant.aspx?id=76> *recently but I son't really know much about the taxonomy of these species. It seems to be much more spreading and invasive were limestone is abundant near the surface or other lime sources like concrete foundations or oystershell, etc... It gets the same rust too but not nearly as badly and usually just before it goes dormant for me anyway. I really enjoy that one whether Oxalis crassipes, O. articulata, or other name. It is the only Oxalis I have commonly encountered growing in the southeast U.S. that has fuzzy leaves which helps identify it. As aside, I have seen white flowered forms of Oxalis debilis as well, though only very rarely. -- Alani Davis