Radish grass, formerly known as roadside green. There are roadside young crops in China from southwest to northeast. The underground part of the former is used as medicine and the young leaves are eaten. Perennial herbs; Most leaves are basal, with small stems and leaves, pinnately compound leaves or harp-like division, and the top lobe is the largest; Flowers bisexual, yellow, white or red, solitary or arranged in corymbose inflorescences; Calyx tube campanulate, lobes 5, accessory sepals 5; Petals 5; There are many male calyxes; Carpels are numerous, separate, and become achenes when mature. Styles are long and persistent, sometimes knotted or pinnate.

Identification characteristics: perennial herbs; Stipules are usually connected with petioles; Sepals and petals are 5 each. Pistil several to many, born on conical receptacle. The upper part of the style has joints, which fall off at the joints when it matures, and the style persists on the fruit. The apex of persistent part is curved, and each carpel has 1 ovule; Achenes separate from each other.

Detailed features: perennial herbs. The basal leaves are odd-numbered pinnate compound leaves, and the terminal leaflets are extra large, which become pseudo-pinnate compound leaves. Cauline leaves are few in number and often appear in the form of bracts. Stipules are usually connate with petioles. Flowers bisexual, solitary or corymbose; Calyx tube gyro-hemispherical, sepals 5, arranged in tweezers, attached sepals 5, smaller, alternate with sepals; Petals 5, yellow, white or red; Stamens are numerous, and the disk is on the upper part of calyx tube, smooth or protruding; Pistils are numerous, inserted on prominent receptacle, separated from each other; Style filiform, disk around calyx tube mouth; Carpels are numerous, style is filiform, stigma is small, the upper part is twisted, and it falls off from the bend after maturity; Each carpel contains 1 ovule, ascending. Achenes are small, stalked or sessile, and the top of the fruit is hooked; The seeds are erect, the seed coat is membranous and the cotyledons are rectangular. Chromosome cardinal number x = 7.