- clover fern, pepperwort - any of several water ferns of the genus Marsilea having four leaflets
--1 is a kind of aquatic fern, water fern
--1 is a member of Marsilea, genus Marsilea
--1 has particulars:nardoo, nardo, common nardoo, Marsilea drummondii; water clover, Marsilea quadrifolia - common garden cress, garden pepper cress, pepper grass, pepperwort, Lepidium sativum - annual herb used as salad green and garnish
--2 is a kind of cress, cress plant
--2 is a member of Lepidium, genus Lepidium
--2 has parts: garden cress