The medicinal names of petunia seeds are Er Jiao, Black Jiao and White Jiao.

Black clown is black petunia seed, white clown is white petunia seed, and two clowns is a mixture of black and white clowns.

In this way, we know that black petunia is a classification of petunia and the two are not equivalent.

Petunia seeds are mainly used to treat diarrhea and laxative, eliminate phlegm and wash away drinks, kill insects and attack accumulation. It is used for edema and fullness, incontinence, phlegm and drink accumulation, gas reversal, asthma and cough, worm accumulation and abdominal pain, ascaris lumbricoides, tapeworm disease.

Side effects: excessive dosage can occur neurological symptoms and blood in the stool, abdominal pain, vomiting and other side effects. Therefore, it should not be applied to deficiency and distension caused by deficiency of positive qi.