Vascular Plants

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Scientific names beginning with I:
13 genera
33 species, 4 subspecies and varieties
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Idahoa scapigeraflatpod, scalepod
Distribution: East of the Cascades in Washington; Washington sout to California, east to Idaho.
Habitat: Shrub-steppe, especially with sagebrush.
Ilex aquifoliumEnglish holly
Distribution: Introduced west of the Cascades in Washington; British Columbia south to California; Ontario province.
Habitat: Spread by birds, mostly forested areas at low elevations.
Iliamna longisepalalong-sepal globemallow
Distribution: Kittitas County to Chelan and Douglas counties in Washington; endemic to Washington.
Habitat: From sagebrush to ponderosa pine areas at low elevations.
Iliamna rivularis
Distribution: East of the Cascades in Washington; British Columbia south to Oregon, east to Montana and Colorado.
Habitat: Somewhat moist areas, foothills to forest openings at mid-elevations.
var. rivularis – streambank globemallow
Impatiens aurellavaried jewelweed
Distribution: Extreme southeast Washington and northern Idaho to southeast British Columbia and western Montana.
Habitat: Moist woods.
Impatiens capensisspotted jewelweed
Distribution: Occurring west of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Moist woods at low elevations.
Impatiens ecornutaspurless jewelweed
Distribution: Occurring on both sides of the Cascades in Washington; southern British Columbia to northwest Oregon, east to Montana.
Habitat: Moist, shady woods.
Impatiens glanduliferapoliceman's helmet
Distribution: Introduced in western Washington and British Columbia
Habitat: Escaped from cultivation at low elevations
Impatiens noli-tangereboreal jewelweed, or western touch-me-not
Distribution: Alaska to Oregon, from the coast inland to Idaho.
Habitat: Moist woods.
Impatiens ×pacificaPacific jewelweed
Distribution: Occurring in lowlands west of the Cascades in Washington; Washington south to Oregon.
Habitat: Wet areas including wetlands, sloughs, forest edges, and disturbed areas.
Impatiens parviflorasmall-flowered jewelweed; small-flowered touch-me-not
Distribution: Currently (2016) known in Washington from King County (only); southwestern British Columbia, western Washington and northwestern Oregon; also occurring in eastern North America.
Habitat: Disturbed forest edge and understory at low elevations, often where at least seasonally moist.
Inula heleniumelecampane, inula
Distribution: Introduced as an ornamental and escaped, widespread in moister parts of the United States; west of the Cascades in Oregon and Washington
Habitat: Fields, roadsides and similar waste ground.
Ionactis stenomeresRocky Mountain ankle-aster, Rocky Mountain aster
Distribution: Southeast British Columbia and northeast Washington, and adjacent Idaho and Montana.
Habitat: Open hillsides and forest openings, moderate to fairly high elevations in the mountains.
Ipomopsis aggregata
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains, Oklahoma and Texas.
Habitat: Open or lightly wooded, drier meadows and rocky slopes, lowlands to fairly high elevations in the mountains.
ssp. aggregata – scarlet gilia, skyrocket
ssp. formosissima – scarlet gilia, skyrocket
Ipomopsis congesta
Distribution: Occurring on the eastern border of Washington; Washington south to California, east to the Great Plains.
Habitat: Dry, open areas at low to middle elevations.
ssp. congesta – ballhead gilia, many-flowered gilia
Iris foetidissimastinking iris
Iris germanicabearded iris, German iris
Iris missouriensiswestern blue flag, Rocky Mountain iris
Distribution: Occurring chiefly east of the Cascades crest in Wahington, but also known from the Puget Sound area; British Columbia south to California, east to the Rocky Mountains.
Habitat: Common in vernally moist meadows, especially in sagebrush and Ponderosa pine forests.
Iris pseudacoruspale yellow iris
Distribution: Widely distributed throughout much of Washington; widely distributed throughout much of North America.
Habitat: Weed in ditches and ponds at low elevations.
Iris tenaxflag, Oregon iris flag, tough-leaf iris
Distribution: Occurring west of the Cascades crest in Washington; Washington south to California.
Habitat: Prairies and pastures, open oak and coniferous forests, low elevations.
Isatis tinctoriaDyer's woad
Distribution: Known only from scattered locations in central Washington; British Columbia south to California, east to the Rocky Mountains; also occurring in parts of central and eastern North America.
Habitat: Disturbed dry ground, pastures, and roadsides, where often escaped from cultivation.
Isoetes bolanderiBolander's quillwort
Isoetes howelliiHowell's quillwort
Isoetes maritimamaritime quillwort
Isoetes minima
Distribution: Currently known only from Kittitas and Spokane Counties in Washington, and in south-central British Columbia.
Habitat: Seasonally moist swales and vernal pools at middle elevations among open conifer forest or sagebrush-steppe.
Isoetes nuttalliiNuttall's quillwort
Isoetes occidentaliswestern quillwort
Isoetes tenellabristle-like quillwort, spiny spored quillwort
Isolepis cernualow clubrush, low lateral clubrush
Distribution: Coastal from Southern British Columbia south to northern Mexico.
Habitat: Usually in brackish to saline water of marshes, beaches, and shores.
Isolepis setaceaEurasian bulrush, bristle-leaf sedge
Iva axillarisdeeproot, deer root, poverty weed
Distribution: Chiefly east of the Castades, southern British Columbia to California, east to Manitoba and Oklahoma.
Habitat: Dry, often alkaline places, in the valleys, plains and foothills.
Ivesia gordoniigordon's ivesia, alpine mousetail
Distribution: Mt. Adams, Wenatchee and Blue Mountains in Washington; Blue and Wallowa Mountains in Oregon; Montana to Colorado in the Rockies, west to California.
Habitat: Floodplains and riverbanks to alpine ridges and talus.
Ivesia tweedyiTweedy's mousetail
Distribution: East of the Cascades crest in Washington; Washington east to Idaho and Montana.
Habitat: Dry, open to wooded areas, mid- to high elevations in the mountains.