Impatiens (pronounced /ɪmˈpeɪʃənz/) is a genus of about 850–1,000 species of flowering plants, widely distributed throughout the Northern Hemisphere and tropics. Together with the puzzling Hydrocera triflora, this genus makes up the family Balsaminaceae. Such a situation is highly unusual, and phylogenetic studies might reveal that Impatiens needs to be split up; some of its species might be closer to Hydrocera than to their presumed congeners.
Common names include impatiens, jewelweeds, and, somewhat ambiguously, "balsams" and "touch-me-nots". As a rule-of-thumb, "jewelweed" is used exclusively for Nearctic species, "balsam" is usually applied to tropical species, and "touch-me-not" is typically used in Europe and North America. Some species commonly planted in horticulture have altogether more fanciful names, such as "Busy Lizzie" (the well-known I. walleriana).