| Scientific Name (* Introduced) |
Family | Common Name | Habitat | Bloom Period |
| Abronia mellifera | Nyctaginaceae | white sand verbena, honey-scented sand-verbena | shrub-steppe | may, jun, jul |
| Alopecurus geniculatus | Poaceae | water foxtail, water fescue | freshwater | may, jun, jul |
| Alyssum alyssoides * | Brassicaceae | pale alyssum, small alison, pale madwort | eastern forest, shrub-steppe, disturbed areas | apr, may, jun, jul |
| Anthemis cotula * | Asteraceae | stinking chamomile, mayweed chamomile, dogfennel | disturbed areas | may, jun, jul, aug, sep, oct |
| Apocynum cannabinum | Apocynaceae | Indian-hemp | freshwater, disturbed areas | jun, jul, aug, sep |
| Arnica fulgens | Asteraceae | foothill arnica, orange arnica, shining leopardbane | eastern forest, shrub-steppe | may, jun, jul |
| Astragalus inflexus | Fabaceae | bent milk-vetch, hairy milk-vetch | shrub-steppe | apr, may, jun, jul |
| Astragalus sclerocarpus | Fabaceae | woody-pod milk-vetch, stalked-pod milk-vetch | eastern forest, shrub-steppe | may |
| Bassia scoparia * | Amaranthaceae | summer or mock cypress, red belvedere | disturbed areas | jul, aug, sep |
| Beckmannia syzigachne | Poaceae | American sloughgrass | freshwater | jun, jul |
| Clematis hirsutissima | Ranunculaceae | eastern forest, shrub-steppe | may, jun | |
| Descurainia pinnata | Brassicaceae | western tansymustard, western tansymustard shortpod tansymustard | eastern forest, prairie or bald, shrub-steppe | apr, may, jun, jul |
| Downingia elegans | Campanulaceae | elegant calicoflower, common downingia | freshwater | jun, jul, aug |
| Echinochloa crus-galli * | Poaceae | barnyard-grass, large barnyard-grass | disturbed areas | jun, jul, aug, sep, oct |
| Elaeagnus angustifolia * | Elaeagnaceae | Russian-olive | eastern forest, shrub-steppe, freshwater | may, jun, jul |
| Eleocharis macrostachya | Cyperaceae | creeping spikerush | ||
| Eragrostis cilianensis * | Poaceae | stink-grass, stink grass | disturbed areas | jun, jul, aug, sep, oct |
| Erythronium grandiflorum var. grandiflorum | Liliaceae | |||
| Euphorbia serpillifolia | Euphorbiaceae | |||
| Glycyrrhiza lepidota | Fabaceae | American licorice, wild licorice | freshwater, disturbed areas | may, jun, jul, aug |
| Grayia spinosa | Amaranthaceae | spiny hopsage | shrub-steppe | apr, may, jun |
| Hypericum scouleri | Hypericaceae | Scouler's St. Johnswort, Norton's St. Johnswort | western forest, eastern forest, freshwater | jun, jul, aug, sep |
| Lactuca serriola * | Asteraceae | prickly lettuce | disturbed areas | jul, aug, sep |
| Lathyrus lanszwertii var. bijugatus | Fabaceae | |||
| Linanthus pungens | Polemoniaceae | prickly phlox | eastern forest, shrub-steppe | may, jun, jul |
| Lomatium dissectum | Apiaceae | fern-leaf biscuitroot, fern-leaved desert-parsley | eastern forest, prairie or bald, shrub-steppe | apr, may, jun |
| Lycopus asper | Lamiaceae | rough bugleweed, rough water-horehound | freshwater | jun, jul, aug |
| Pascopyrum smithii | Poaceae | western wheatgrass | ||
| Penstemon attenuatus | Plantaginaceae | sulphur penstemon, taper-leaved penstemon | eastern forest | jun, jul, aug |
| Persicaria lapathifolia | Polygonaceae | pale smartweed | freshwater, disturbed areas | may, jun, jul, aug, sep |
| Persicaria maculosa * | Polygonaceae | spotted lady's-thumb, redshank | freshwater, disturbed areas | mar, apr, may, jun, jul, aug |
| Rosa nutkana ssp. macdougalii | Rosaceae | Nootka rose | ||
| Salix scouleriana | Salicaceae | Scouler's willow | western forest, eastern forest, shrub-steppe, freshwater | mar, apr, may |
| Scutellaria angustifolia | Lamiaceae | narrow-leaved skullcap | eastern forest, shrub-steppe | may, jun, jul |
| Senecio vulgaris * | Asteraceae | old-man-in-the-Spring, common groundsel | disturbed areas | apr, may, jun, jul, aug, sep |
| Solidago lepida var. salebrosa | Asteraceae | Rocky Mountains Canada goldenrod | western forest, eastern forest, prairie or bald, shrub-steppe, freshwater, disturbed areas | jul, aug, sep |
| Stachys pilosa var. pilosa | Lamiaceae | swamp hedge-nettle | jun, jul, aug | |
| Stellaria media * | Caryophyllaceae | common chickweed | prairie or bald, disturbed areas | mar, apr, may, jun, jul, aug, sep, oct, nov-feb |
| Trillium petiolatum | Melanthiaceae | purple trillium, Idaho trillium, purple wakerobin | eastern forest, freshwater | apr, may, jun |
| Typha latifolia | Typhaceae | broad-leaf cattail, common cattail | freshwater | jun, jul |
| Viola nephrophylla | Violaceae | northern bog violet | 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.