Oxalis tuberosa is a perennial herbaceous plant that overwinters as underground stem tubers. Early investigators isolated oxalic acid from wood-sorrel ("Oxalis"). Oxalate-rich plants include fat hen ("lamb's quarters"), sorrel, and several "Oxalis" species. Related to the common wood-sorrel ("Oxalis acetosella"), it is commonly used as an ornamental plant. The common name wood sorrel is often used for other plants in the genus "Oxalis". "Oxalis" species are also known as sour grass, sour trefoil, and shamrock. "Oxalis stricta" contains large amounts of vitamin C. Neighbors' Bermuda grass often seeded in, with "Oxalis" sp. and other weeds. The flora also include invasive species such as prickly pears and the yellow oxalis. Like most African "Oxalis" species, it produces adventitious subterranean propagules. "Oxalis triangularis" grows from corms, propagated by division. It sometimes grows together with low-growing "Oxalis" and "Senecio". Oxalis flowers range in colour from whites to yellows, peaches, pinks, or multi-coloured flowers. The leaves of "Oxalis oregana" were eaten by the Cowlitz, Quileute and Quinault peoples. This species is a causal agent of rust on plants in the genus "Oxalis".