| Scientific Name (* Introduced) |
Family | Common Name | Habitat | Bloom Period |
| Adenocaulon bicolor | Asteraceae | pathfinder, trailplant | western forest, eastern forest | jun, jul, aug, sep |
| Alnus rhombifolia | Betulaceae | white alder, California alder | eastern forest, shrub-steppe, freshwater | mar, apr, nov-feb |
| Angelica arguta | Apiaceae | Lyall's angelica, sharptooth angelica | western forest, eastern forest, freshwater | jun, jul, aug |
| Astragalus inflexus | Fabaceae | bent milk-vetch, hairy milk-vetch | shrub-steppe | apr, may, jun, jul |
| Balsamorhiza careyana | Asteraceae | Carey's balsamroot | eastern forest, shrub-steppe | mar, apr, may, jun, jul |
| Balsamorhiza incana | Asteraceae | hoary balsamroot, woolly balsamroot | eastern forest, shrub-steppe | may, jun, jul |
| Capsella bursa-pastoris * | Brassicaceae | shepherd's purse | western forest, eastern forest, prairie or bald, shrub-steppe, disturbed areas | mar, apr, may, jun, jul |
| Centromadia pungens ssp. pungens * | Asteraceae | common spikeweed | ||
| Clintonia uniflora | Liliaceae | queen's cup, bride's-bonnet | western forest, eastern forest | may, jun, jul |
| Conium maculatum * | Apiaceae | poison hemlock, poison-hemlock | disturbed areas | may, jun, jul, aug |
| Cornus stolonifera | Cornaceae | |||
| Descurainia longepedicellata | Brassicaceae | eastern forest, shrub-steppe | apr, may, jun | |
| Descurainia pinnata | Brassicaceae | western tansymustard, western tansymustard shortpod tansymustard | eastern forest, prairie or bald, shrub-steppe | apr, may, jun, jul |
| Draba densifolia | Brassicaceae | denseleaf draba, Nuttall's draba, dense-leaf whitlow-grass | eastern forest, subalpine or alpine | jun, jul, aug |
| Echinochloa crus-galli * | Poaceae | barnyard-grass, large barnyard-grass | disturbed areas | jun, jul, aug, sep, oct |
| Equisetum laevigatum | Equisetaceae | smooth horsetail, smooth scouring-rush | freshwater | no flowers |
| Erigeron pumilus var. intermedius | Asteraceae | shaggy fleabane | ||
| Geum macrophyllum | Rosaceae | largeleaf avens, bigleaf avens | western forest, eastern forest, subalpine or alpine | apr, may, jun, jul, aug |
| Iliamna rivularis | Malvaceae | streambank globemallow | eastern forest, freshwater | jun, jul, aug |
| Lathyrus nevadensis var. cusickii | Fabaceae | |||
| Linum lewisii var. lewisii | Linaceae | Wild blue flax | eastern forest, subalpine or alpine | may, jun, jul |
| Lonicera ciliosa | Caprifoliaceae | orange honeysuckle | western forest, eastern forest, prairie or bald | may, jun, jul |
| 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 |
| Physaria oregona | Brassicaceae | Oregon twinpod | eastern forest, shrub-steppe | apr, may, jun |
| Pyrrocoma carthamoides var. cusickii | Asteraceae | Large-flowered goldenweed, Columbia goldenweed | jun, jul, aug | |
| Ranunculus uncinatus | Ranunculaceae | woodland buttercup, little buttercup | western forest, eastern forest, freshwater | apr, may, jun, jul |
| Ribes oxyacanthoides var. cognatum | Grossulariaceae | Umatilla gooseberry | mar, apr, may | |
| Rorippa curvisiliqua | Brassicaceae | curvepod yellowcress, western yellowcress | freshwater | may, jun, jul, aug, sep |
| Rubus bifrons * | Rosaceae | Himalayan blackberry, European blackberry | western forest, prairie or bald, freshwater, disturbed areas | may, jun, jul |
| Rubus leucodermis | Rosaceae | whitebark raspberry, blackcap | western forest, eastern forest, disturbed areas | apr, may, jun, jul |
| Selaginella wallacei | Selaginellaceae | Wallace's spikemoss | western forest, eastern forest, subalpine or alpine | no flowers |
| Solanum dulcamara * | Solanaceae | climbing nightshade, bittersweet nightshade, felonwort | freshwater, disturbed areas | may, jun, jul, aug, sep |
| Taraxacum officinale * | Asteraceae | common dandelion | western forest, eastern forest, prairie or bald, shrub-steppe, subalpine or alpine, freshwater, disturbed areas | mar, apr, may, jun, jul, aug, sep, oct |
| Taxus brevifolia | Taxaceae | Pacific yew, western yew | western forest, eastern forest | no flowers |
| Thermopsis montana | Fabaceae | mountain golden-banner, Hitchcock's thermopsis | western forest, eastern forest | may, jun, jul, aug |
| Thermopsis montana var. ovata | Fabaceae | slender goldenbanner | ||
| Thysanocarpus curvipes | Brassicaceae | sand fringepod, lacepod | eastern forest, prairie or bald, shrub-steppe | apr, may, jun |
| Trillium petiolatum | Melanthiaceae | purple trillium, Idaho trillium, purple wakerobin | eastern forest, freshwater | apr, may, jun |
| Verbascum thapsus * | Scrophulariaceae | common mullein, flannel mullein, great mullein | eastern forest, shrub-steppe, disturbed areas | jun, jul, aug, sep |
| Verbena bracteata | Verbenaceae | big-bract verbena, carpet vervain | eastern forest, shrub-steppe, disturbed areas | may, jun, jul, aug, sep |
| Veronica americana | Plantaginaceae | American speedwell, American-brooklime | western forest, eastern forest, shrub-steppe, freshwater | may, jun, jul |
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.