| Scientific Name (* Introduced) |
Family | Common Name | Habitat | Bloom Period |
| Abronia mellifera | Nyctaginaceae | white sand verbena, honey-scented sand-verbena | shrub-steppe | may, jun, jul |
| Acer saccharinum * | Sapindaceae | silver maple | freshwater, disturbed areas | mar, apr |
| Achnatherum hymenoides | Poaceae | Indian ricegrass | shrub-steppe | may, jun |
| Astragalus sclerocarpus | Fabaceae | woody-pod milk-vetch, stalked-pod milk-vetch | eastern forest, shrub-steppe | may |
| Atriplex heterosperma * | Amaranthaceae | Russian atriplex or orach | shrub-steppe, disturbed areas | jun, jul, aug |
| Berula incisa | Apiaceae | |||
| Bolboschoenus maritimus ssp. paludosus | Cyperaceae | salt-marsh bulrush | ||
| Brickellia grandiflora | Asteraceae | tasselflower brickellbush, large flowered tasselflower, large flowered thoroughwort | eastern forest, shrub-steppe | jul, aug, sep, oct |
| Castilleja thompsonii | Orobanchaceae | Thompson's Indian paintbrush | eastern forest, shrub-steppe, subalpine or alpine | may, jun, jul, aug, sep |
| Chrysothamnus viscidiflorus ssp. lanceolatus | Asteraceae | Green rabbit-brush | jul, aug, sep | |
| Erigeron filifolius | Asteraceae | threadleaf fleabane | eastern forest, shrub-steppe | may, jun, jul, aug |
| Erigeron piperianus | Asteraceae | Piper's fleabane | shrub-steppe | may, jun |
| Eriogonum thymoides | Polygonaceae | thyme buckwheat, thyme-leaf wild buckwheat | eastern forest, shrub-steppe | apr, may, jun |
| Hackelia ciliata | Boraginaceae | Okanogan stickseed | eastern forest, shrub-steppe | may, jun |
| Heliotropium curassavicum | Heliotropiaceae | salt heliotrope, seaside heliotrope | shrub-steppe | jun, jul, aug, sep |
| Hymenopappus filifolius var. filifolius | Asteraceae | Columbia cut-lf | may, jun, jul | |
| Isoetes howellii | Isoetaceae | Howell's quillwort | no flowers | |
| Juncus uncialis | Juncaceae | twelfth rush, inch-high rush | freshwater | may, jun |
| Lemna trisulca | Araceae | star duckweed, ivy or ivy-leaved duckweed | freshwater | jun, jul, aug, sep |
| Limosella aquatica | Scrophulariaceae | water mudwort, awl-leaf mudwort | shrub-steppe, freshwater | jun, jul, aug, sep, oct |
| Lupinus lepidus var. aridus | Fabaceae | prairie lupine | ||
| Lupinus sulphureus var. bingenensis | Fabaceae | |||
| Microgilia minutiflora | Polemoniaceae | |||
| Navarretia leucocephala ssp. minima | Polemoniaceae | Least navarretia | may, jun, jul | |
| Oreocarya glomerata | Boraginaceae | |||
| Oreocarya spiculifera | Boraginaceae | |||
| Pectocarya penicillata | Boraginaceae | sleeping combseed, winged pectocarya, shortleaf combseed | shrub-steppe | apr, may, jun |
| Phlox caespitosa | Polemoniaceae | tufted phlox, clumped phlox | eastern forest, shrub-steppe | apr, may, jun |
| Polygonum polygaloides ssp. polygaloides | Polygonaceae | |||
| Potamogeton nodosus | Potamogetonaceae | long-leaved pondweed, Loddon's pondweed | freshwater | jun, jul, aug |
| Potentilla supina ssp. paradoxa | Rosaceae | bushy cinquefoil | ||
| Psilocarphus oregonus | Asteraceae | Oregon woollyheads | shrub-steppe | mar, apr, may, jun, jul, aug |
| Puccinellia distans * | Poaceae | weeping alkaligrass | freshwater, disturbed areas | jun, jul, aug |
| Salvia dorrii var. incana | Lamiaceae | gray-ball sage, fleshy sage | ||
| Schoenoplectus pungens | Cyperaceae | common bulrush, common threesquare | freshwater | may, jun, jul, aug |
| Schoenoplectus saximontanus | Cyperaceae | Rocky Mountain bulrush | ||
| Townsendia florifer | Asteraceae | showy townsendia, showy Townsend-daisy | shrub-steppe | may, jun, jul |
| Triglochin maritima | Juncaginaceae | seaside arrow-grass | freshwater | may, jun, jul, aug |
| Veronica catenata * | Plantaginaceae | chain speedwell | freshwater | jun, jul |
| Viola glabella | Violaceae | pioneer violet | western forest, eastern forest, freshwater | mar, apr, 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.