jew·el·weed 
(jəl-wēd′)
(jəl-wēd′)n.
Any of several plants of the genus Impatiens having yellowish spurred flowers and five-valved seedpods that burst if touched when ripe. Also called touch-me-not.
[Perhaps from the fact that dew and rainwater collect in jewellike beads on their water-repellent leaves.]