Oxalis is an upright perennial that roots at the lower nodes. However, these new roots do not give rise to rhizomes or new plants. Its three, pale green leaflets are heart-shaped and similar to those of clover. Since oxalis contains an abundance of oxalic acid, leaves are sour and bitter to the taste. Stems are sparsely covered with fine hairs. Flowers are small, but have five conspicuous bright yellow petals. As flowers mature, cucumber-shaped seedpods are formed. These pods are equipped with a built-in triggering mechanism. When completely dry, the slightest touch will send seeds scattering for several feet in all directions.