touch-me-not

 
Pronunciation: /ˈtʌtʃmɪnɒt/

noun

  • a plant of the balsam family, whose ripe seed capsules open explosively when touched, scattering seeds over some distance.
    • Genus Impatiens, family Balsaminaceae: several species, in particular the yellow balsam (I. noli-tangere)