Plants with white flowers and opposite or whorled leaves - wetland
 Apocynum cannabinum (Indian Hemp) |
 Circaea alpina (Small Enchanter's-Nightshade) |
 Cornus sericea (Red-Osier Dogwood) |
 Epilobium palustre (Marsh Willowherb) |
 Gnaphalium palustre (Western Marsh Cudweed) |
 Gratiola neglecta (Clammy Hedge-Hyssop) |
 Lomatogonium rotatum (Marsh Felwort) |
 Lonicera villosa (Blue Fly Honeysuckle) |
 Lycopus americanus (Water-Horehound) |
 Lycopus asper (Western Water-Horehound) |
 Lycopus uniflorus (Northern Water-Horehound) |
 Lysimachia maritima (Sea Milkwort) |
 Myosurus minimus (Least Mousetail) |
 Pedicularis lanceolata (Swamp Lousewort) |
 Plagiobothrys scouleri (Scouler's Popcornflower) |
 Rhododendron groenlandicum (Labrador Tea) |
 Stellaria longifolia (Long-Leaved Stitchwort) |
 Stellaria longipes (Long-Stalked Stitchwort) |
 Trientalis borealis (Starflower) |
 Veronica peregrina (Hairy Speedwell) |