touch-me-not has 14 distinct synonyms spread across 3 of its 3 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
North American annual plant with usually yellow or orange flowers; grows chiefly on wet rather acid soil
Mediterranean vine having oblong fruit that when ripe expels its seeds and juice violently when touched
prostrate or semi-erect subshrub of tropical America, and Australia; heavily armed with recurved thorns and having sensitive soft grey-green leaflets that fold and droop at night or when touched or cooled
Synonyms, antonyms and the broader and narrower relations for touch-me-not come from Princeton University’s WordNet. Full sources and licences.