Pepperwort Family, Water-Clover Family
2 genera
4 species
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Marsilea muticaAustralian waterclover
Distribution: Known from Snohomish and Pacific counties in Washington; southeastern U.S.
Habitat: Lowland ponds in water to 1 meter deep.
Origin: Introduced
Marsilea oligosporaNelson's pepperwort, Pacific clover-fern water-clover
Origin: Native
Marsilea vestitahairy clover-fern, pepperwort, water-clover pepperwort
Distribution: Both sides of the Cascades in Washington; British Columbia south to California, east to Minnesota and Louisiana.
Habitat: Ponds, vernal pools, floodplains.
Origin: Native
Spores: Spores produced April-October
Pilularia americanaAmerican pillwort
Origin: Native