1、 Blade difference

The leaves of liuchuanyu are mostly alternate, a few are whorled in the lower part, and the upper part is alternate, in strip shape, about 2-6cm long and 2-4mm wide. The leaves of goldfish grass are opposite at the lower part and alternate at the upper part, which are lanceolate and then oblong lanceolate, similar in size to the former, and the edge is entire

2、 Stem difference

The stem of Liu Chuanyu is glabrous, erect and usually branched in the upper part. The stem base of goldfish grass is hairless, there are glandular hairs in the middle and upper part, and sometimes branches at the base

3、 The difference between flowers

Liu Chuanyu is a raceme, the bracts are strip-shaped to narrow lanceolate, the calyx lobes are lanceolate, and the corolla color is yellow. The calyx of goldfish grass has 5 deep lobes, the lobes are oval, and the corolla has a variety of colors, changing from red or purple to white