Grand Redstem, Scarlet Ammannia, Sessile Toothcup, Western Ammania: Ammannia robusta (Synonyms: Ammannia coccinea, Ammannia coccinea ssp. robusta, Ludwigia scabriuscula) -
The Genus Lythrum in the Columbia River Gorge: Flowers with 5-7 showy petals per flower.
Grass Poly, Hyssop Loosestrife: Lythrum hyssopifolium (Synonyms: Lythrum adsurgens, Lythrum hyssopifolia) -
Purslane Loosestrife, Spatulaleaf Loosestrife, Spatula-leaf Loosestrife, Water Ppurslane: Lythrum portula (Synonym: Peplis portula) -
Long Purples, Purple Loosestrife, Spiked Willow-herb: Lythrum salicaria (Synonyms: Lythrum salicaria var. gracilior, Lythrum salicaria var. tomentosum, Lythrum salicaria var. vulgare) -
Lowland Rotala, Tooth Cup: Rotala ramosior (Synonyms: Rotala catholica, Rotala dentifera, Rotala ramosior var. interior, Rotala ramosior var. typica) -