Mulligan (Agriculture Canada, Ottawa, retired)
Hydrocharis morsus-ranae L.,European frogbit, hydrocharide grenouillette
Perennial; spreading by seeds and vegetative buds and fragments; flowers white (with yellow centre); common in southern Quebec and Ontario; stems to 6 feet (20 dm) long; floating aquatic in still and slowly moving water of bays, ponds, rivers, streams, marshes and ditches; introduced from Europe and is rapidly increasing in range in North America. Text and photos of European frogbit by Stephen J. Darbyshire
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European frogbit, hydrocharide grenouillette (plants)
European frogbit, hydrocharide grenouillette (flower)