SISON, in botany, a genus of the pentandria digynia class. The fruit is oval and striated; and the involucre consists of four leaves. There are six species, three of them natives of Britain, viz. the amomum, or bastard stone-parsley; the segetum, or corn-parsley; and the inundatum, or least water-parsley. The seed of the amomum is one of the four lesser hot seeds of the Mops; and is an attenuant, aperient, and carminative.