Arum Family, Duckweed Family
Lemnaceae [FNA22, HC]
8 genera
12 species
1 subspecies and varieties
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Arum italicumItalian lords and ladies, large cuckoo pint
Distribution: Known from lowlands west of Cascades crest in Washington; southwestern British Columbia to California; scattered location in central and eastern U.S.
Habitat: Forest understory and disturbed locations near urbanized areas.
Origin: Introduced from Europe
Flowers: April-June
ssp. italicum – large cuckoo pint, Italian lords and ladies
Lemna minorcommon duckweed, lesser duckweed, water lentil
Distribution: Cosmopolitan in temperate and subtropical regions
Habitat: In standing or slow-moving fresh water
Origin: Native
Flowers: June - October
Lemna minutaleast duckweed
Origin: Native
Lemna trisulcaivy duckweed, ivy-leaved duckweed, star duckweed
Distribution: Throughout much of the temperate and subtropical regions of the world.
Habitat: Quiet streams and standing fresh water.
Origin: Native
Flowers: July - September
Lemna turioniferaturion duckweed
Distribution: Occurring in aquatic environments throughout Washington; cosmopolitan in temperate and subtropical regions.
Habitat: In standing or slow-moving fresh water.
Origin: Native
Flowers: June-October
Lysichiton americanusskunk cabbage, yellow skunk cabbage
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to northern Idaho and western Montana.
Habitat: Marshes, swamps, and forested wetlands from sea level to middle elevations in the mountains.
Origin: Native
Flowers: March-July
Peltandra virginicaarrow arum, tuckahoe
Distribution: Occurring in scattered locations west of the Cascades crest in Washington; western Washington to northwestern Oregon, otherwise eastern North America where native.
Habitat: Shallow water of slow moving water, ponds, and lake shores at low elevation.
Origin: Introduced from eastern North America
Flowers: June-August
Spirodela polyrhizaduckmeal, common duckmeat, greater duckweed
Distribution: Widely distributed throughout the United States and southern Canada
Habitat: Quiet water, ponds, marshes and slow-moving streams
Origin: Native
Flowers: July - September
Wolffia borealisnorthern watermeal
Distribution: Oregon and Idaho, and most of the United States from Kansas east and Tennesee north
Habitat: Ponds and standing water at low elevations
Origin: Native
Wolffia brasiliensisBrazilian watermeal
Distribution: Common in central and eastern United States, occasional in Washington to California, chiefly west of the Cascades
Habitat: Ponds and standing water at low elevations
Origin: Native
Wolffia columbianaColumbian watermeal
Origin: Native
Wolffiella gladiatasword bogmat, mud-midget
Origin: Introduced from eastern United States