1、 Different plants

The length of Tongquan grass is about 3 to 30 cm. There are no small hairs on the stem or scattered with short and soft hairs. The root is relatively thin

The length of Lobelia chinensis is about 6 to 15 cm. The stem is relatively thin and weak without small hairs

2、 Different blades

The leaves of Tongquan grass are shaped like an inverted spoon, about 2 to 6 cm long, and there are indistinct sparse serrations on the edge of the leaves

Lobelia Lobelia leaves are oval, lanceolate to strip-shaped. The leaves are large, about 8 to 25 cm long and 2 to 6 cm wide. The edges of the leaves are obviously serrated without small hairs

3、 Different flowers

The flowers of Tongquan grass are sparsely distributed, and the corolla colors are white, purple and blue. The flowering period starts from April

The stem of half lotus is thin, the color of corolla is pink or white, and the flowering period starts from May