any of various temperate and tropical aquatic or marsh ferns of the genus Marsilea, having floating leaves consisting of four leaflets: family Marsileaceae
2.
any of several plants of the genus Lepidium, esp L. campestre, of dry regions of Eurasia, having small white flowers and pungent seeds: family Brassicaceae (crucifers)
Usual US and Canadian name: peppergrass
pepperwort in American English
(ˈpɛpərˌwɜrt)
noun
1.
peppergrass
2.
any of a genus (Marsilea, family Marsileaceae) of water ferns having long-stalked leaves with four leaflets