Summer solstice is a perennial or perennial herb in Labiatae, with a height of15 ~ 60 cm. The stem is branched from the base, erect, quadrangular and hairy. Leaves opposite, stipitate; Basal leaves are nearly round, the base is heart-shaped, undivided or trifoliate; Cauline leaves are palmately divided, with blunt teeth or lobules at the edge and dense hairs on both sides. Inflorescence; There are 6 ~10 flowers, with long Hua Lun intervals and spiny and curved bracts; Calyx tubular-bell-shaped; Corolla white, 2-lipped, upper lip longer, entire, lower lip trifoliate. Nutlets are obovate. Seed propagation.

Summer solstice grass is born in farmland, roadside or house, and some wheat and vegetables are seriously affected.