popweed
/ˈpɒpwiːd/noun
1The bladderwrack, Fucus vesiculosus. Now chiefly North American.
2 North American. Any of various herbaceous plants of the family Brassicaceae (Cruciferae) with pods that pop; especially a bladderpod (genus Lesquerella).
Origin
Mid 19th century; earliest use found in R. D. Blackmore (1825–1900), novelist and fruit farmer. From pop- + weed; compare quots. 1989 at sense 1, 1961 at sense 2.