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Does anyone have any information about sour grass or wild mustard for cavies?
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The two plants commonly called sourgrass of which I am aware are Rumex acetosella and various species of Oxalis. I have not been able to find the exact oxalic acid content of each, but it's generally recommended that humans eat Oxalis, also known as wood sorrel and by various other names, in small quantities if at all, and Rumex is also known to contain significant oxalic acid.