Oxalis: perennial herbs, all sparse; Stems prostrate or obliquely ascending, much branched. Leaves alternate, palmately compound, with 3 leaflets, inverted heart shape, leaflets sessile. ?

Flowers are yellow. They like sunny, warm and humid environment. Summer hot areas should be semi-shaded, drought-resistant and not cold-resistant. Generally, garden soil can grow, but sandy loam rich in humus grows vigorously and has a short dormant period in summer. The whole herb is used as medicine, which has the effects of clearing away heat and toxic materials, reducing swelling and resolving hard mass.

Related knowledge:

Oxalis in a broad sense includes most plants of Oxalis with rich colors and diverse forms.

The common sorrel with purple flowers in China is sorrel with red leaves, which has no obvious stems, basal leaves, slender petioles and leaves composed of three inverted heart-shaped leaflets.

Occasionally, individuals composed of four leaflets mutate, commonly known as "lucky grass". The common large whorled yellow flower is oxalis, also known as hemp seed, and its plant characteristics are similar to those of purple flower. The small whorled yellow flower, that is, oxalis species in a narrow sense, although it belongs to the same family as oxalis purpurea, has slender stolons and opposite leaves, which are composed of three leaflets, but the leaflets are smaller in size.