Southern Cross University. Australia: It’s known as native spinach, now researchers at Southern Cross
University are trying to determine if Warrigal greens contain similar
levels of oxalic acid as found in spinach and kale. One of the main obstacles to Warrigal greens (Tetragonia tetragoniodes)
being adopted as a mainstream vegetable - and a viable alternative to
spinach - is the perceived high levels of oxalic acid in the leaves. In
rare cases, too much oxalic acid can cause kidney stones.