The Oxalis is a delicate perennial herb that stays fairly short and small, reaching heights of between five and 30 centimetres. The compound leaves have three leaflets (resembling clover) and either has a tiny stalk or none at all. The flowers occur on their own (as opposed to in clusters) and have five petals and five free sepals. They are found in pink, white, red, purple and yellow varieties. The leaves and flowers droop or fold closed after nightfall. A seed-filled capsule is the fruit of the plant and can bear only one seed, or many at a time. The sap in the stem of the plant is sour, a characteristic for which this edible plant is often known.