| Scientific Name (* Introduced) |
Family | Common Name | Habitat | Bloom Period |
| Alhagi maurorum * | Fabaceae | camelthorn | shrub-steppe, disturbed areas | jun, jul, aug |
| Amaranthus retroflexus * | Amaranthaceae | red-root pigweed | disturbed areas | jul, aug, sep, oct |
| Amsinckia intermedia | Boraginaceae | |||
| Anthemis cotula * | Asteraceae | stinking chamomile, mayweed chamomile, dogfennel | disturbed areas | may, jun, jul, aug, sep, oct |
| Balsamorhiza rosea | Asteraceae | rosy balsamroot | eastern forest, shrub-steppe | apr, may |
| Balsamorhiza sagittata | Asteraceae | arrowleaf balsamroot | eastern forest, shrub-steppe | apr, may, jun, jul |
| Bidens cernua | Asteraceae | nodding beggarticks, bur marigold | freshwater | jul, aug, sep |
| Centaurea solstitialis * | Asteraceae | yellow star-thistle, St. Barnaby's thistle | disturbed areas | jul, aug, sep |
| Claytonia perfoliata | Montiaceae | miners lettuce | western forest, eastern forest, prairie or bald, shrub-steppe, saltwater shores | apr, may, jun |
| Clematis ligusticifolia | Ranunculaceae | western white clematis, western clematis | eastern forest, shrub-steppe, freshwater | jun, jul, aug, sep |
| Collomia grandiflora | Polemoniaceae | grand collomia, large-flower mountain-trumpet, large-flowered collomia | eastern forest, prairie or bald, shrub-steppe | may, jun, jul, aug |
| Collomia linearis | Polemoniaceae | tiny trumpet, narrow-leaf mountain-trumpet, narrow-leaf collomia | western forest, eastern forest, shrub-steppe, disturbed areas | may, jun, jul, aug |
| Crataegus douglasii | Rosaceae | black hawthorn, Douglas' hawthorn | western forest, eastern forest, shrub-steppe, freshwater | may, jun |
| Dieteria canescens var. incana | Asteraceae | hoary-aster | ||
| Dipsacus fullonum * | Dipsacaceae | Fuller's teasel | disturbed areas | jul, aug, sep |
| Equisetum arvense | Equisetaceae | field horsetail, common horsetail | western forest, eastern forest, freshwater, disturbed areas | no flowers |
| Erigeron poliospermus | Asteraceae | purple cushion fleabane, Kittitas fleabane | shrub-steppe | apr, may, jun |
| Erigeron poliospermus var. poliospermus | Asteraceae | Cushion fleabane, hairy-seeded daisy | apr, may, jun | |
| Eriogonum heracleoides | Polygonaceae | parsnip-flower buckwheat, parsnip-flowered eriogonum | eastern forest, shrub-steppe | may, jun, jul |
| Erythranthe guttata | Phrymaceae | seep monkey-flower | western forest, eastern forest, shrub-steppe, subalpine or alpine, freshwater | mar, apr, may, jun, jul, aug, sep |
| Hypericum perforatum * | Hypericaceae | common St. Johnswort, Klamath weed | western forest, eastern forest, prairie or bald, disturbed areas | jun, jul, aug |
| Iris missouriensis | Iridaceae | Rocky Mountain iris, western blue flag | freshwater | may, jun, jul |
| Juncus torreyi | Juncaceae | Torrey's rush | freshwater | jun, jul, aug |
| Lupinus sericeus | Fabaceae | silky lupine | eastern forest, shrub-steppe | may, jun, jul, aug |
| Malva neglecta * | Malvaceae | common mallow, dwarf mallow | disturbed areas | may, jun, jul, aug, sep |
| Matricaria discoidea | Asteraceae | disc mayweed, pineapple weed | disturbed areas | may, jun, jul, aug, sep |
| Melilotus officinalis * | Fabaceae | yellow sweet-clover | disturbed areas | may, jun, jul, aug, sep |
| Mertensia longiflora | Boraginaceae | small bluebells, long-flowered lungwort, trumpet bluebells | eastern forest, shrub-steppe | apr, may, jun |
| Nasturtium officinale * | Brassicaceae | watercress | freshwater | may, jun, jul, aug, sep |
| Persicaria amphibia | Polygonaceae | Water smartweed | freshwater | jun, jul, aug, sep, oct |
| Poa pratensis | Poaceae | Kentucky bluegrass | western forest, eastern forest, prairie or bald, shrub-steppe, freshwater, disturbed areas | apr, may, jun, jul, aug, sep, oct |
| Ranunculus glaberrimus var. glaberrimus | Ranunculaceae | Sagebrush buttercup | mar, apr, may, jun | |
| Robinia pseudoacacia * | Fabaceae | black locust | freshwater, disturbed areas | may |
| Rosa woodsii | Rosaceae | Wood's rose, pearhip rose | eastern forest, shrub-steppe, freshwater | may, jun, jul |
| Salix lasiandra var. caudata | Salicaceae | Pacific willow | ||
| Salix prolixa | Salicaceae | MacKenzie's willow | freshwater | apr, may, jun |
| Schoenoplectus americanus | Cyperaceae | Olney’s three-square bulrush | ||
| Stellaria media * | Caryophyllaceae | common chickweed | prairie or bald, disturbed areas | mar, apr, may, jun, jul, aug, sep, oct, nov-feb |
| Symphyotrichum bracteolatum | Asteraceae | bracted aster, Oregon aster, Eaton's aster | freshwater | jul, aug, sep |
| Trifolium repens * | Fabaceae | white clover, Dutch clover | western forest, eastern forest, disturbed areas | may |
| Verbena hastata | Verbenaceae | swamp verbena, blue verbena, wild hyssop | freshwater, disturbed areas | jul, aug, sep |
Data from Consortium of PNW Herbaria and Burke Herbarium Image Collection. Generated on January 24, 2022
More information on the PlantQuest Image Project can be found at https://biology.burke.washington.edu/herbarium/imagecollection/plantquest.php.