Either of two not closely related flowering plants
lesser celandine (Ficaria verna, formerly Ranunculus ficaria)
greater celandine (Chelidonium majus)
The sensitive plant (Mimosa pudica).
The squirting cucumber (Ecballium elaterium).
The jewelweed, Impatiens noli-tangere, Impatiens capensis, Impatiens parviflora.