Plants with white flowers and opposite or whorled leaves - grassland
 Anemone canadensis (Canada Anemone) |
 Anemone cylindrica (Long-Fruited Anemone) |
 Apocynum androsaemifolium (Spreading Dogbane) |
 Asclepias ovalifolia (Low Milkweed, Dwarf Milkweed) |
 Asclepias verticillata (Whorled Milkweed) |
 Cerastium arvense (Field Chickweed) |
 Chaenorhinum minus (Small Snapdragon) |
 Claytonia lanceolata (Lance-Leaved Spring Beauty) |
 Clematis ligusticifolia (Western Clematis) |
 Collinsia parviflora (Blue-eyed Mary) |
 Ellisia nyctelea (Waterpod, Aunt Lucy) |
 Eremogone congesta (Rocky Ground Sandwort) |
 Euphorbia glyptosperma (Ridge-Seeded Spurge) |
 Euphorbia serpyllifolia (Thyme-Leaved Spurge) |
 Galium boreale (Northern Bedstraw) |
 Gentiana fremontii (Moss Gentian) |
 Gnaphalium palustre (Western Marsh Cudweed) |
 Gratiola neglecta (Clammy Hedge-Hyssop) |
 Gypsophila paniculata (Baby's-Breath) |
 Heuchera parvifolia (Small-leaved Alumroot) |
 Houstonia longifolia (Long-Leaved Bluets) |
 Leptosiphon septentrionalis (Northern Linanthus) |
 Lithophragma glabrum (Rockstar) |
 Lomatogonium rotatum (Marsh Felwort) |
 Lonicera tatarica (Tatarian Honeysuckle) |
 Lysimachia maritima (Sea Milkwort) |
 Minuartia rubella (Boreal Sandwort) |
 Myosurus minimus (Least Mousetail) |
 Navarretia leucocephala (Pincushion Plant) |
 Pedicularis lanceolata (Swamp Lousewort) |
 Penstemon albidus (White Beardtongue) |
 Phlox alyssifolia (Blue Phlox) |
 Phlox hoodii (Moss Phlox) |
 Plagiobothrys scouleri (Scouler's Popcornflower) |
 Polanisia dodecandra (Clammyweed) |
 Polygala verticillata (Whorled Milkwort) |
 Psilocarphus brevissimus var. brevissimus (Dwarf Woolly-Heads) |
 Rhododendron groenlandicum (Labrador Tea) |
 Saponaria officinalis (Bouncing-Bet) |
 Silene csereii (Smooth Catchfly) |
 Silene latifolia (White Cockle) |
 Silene noctiflora (Night-flowering Catchfly) |
 Stellaria media (Common Chickweed) |
 Symphoricarpos albus (Snowberry) |
 Symphoricarpos occidentalis (Buckbrush, Western Snowberry) |
 Tripterocalyx micranthus (Sand Verbena) |
 Veronica peregrina (Hairy Speedwell) |