any of a number of plants (genus Impatiens) of the balsam family, bearing yellow or orange-yellow flowers with short spurs, and seedpods that split at the touch when ripe
See jewelweed in American Heritage Dictionary 4
noun
Any of several plants of the genus Impatiens having yellowish spurred flowers and seedpods that dehisce into five valves when mature. Also called balsam, touch-me-not.