Vascular Plants

Includes all flowering plants, conifers, ferns and fern-allies.

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Common names beginning with I:
21 common names
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Indian (Brassica juncea)
Distribution: Occurring in scattered locations throughout Washington; widely distributed throughout North America.
Habitat: Disturbed areas including fields, roadsides and wastelots.
Origin: Introduced from Eurasia
Flowers: May-July
Many-flower Indian-pipe (Monotropa hypopitys)
Distribution: On both sides of the Cascades in Washington; British Columbia south to California, east to the Atlantic Coast.
Habitat: In humus of coniferous forests at low to mid-elevations.
Origin: Native
Flowers: May-July
One-flower Indian-pipe (Monotropa uniflora)
Distribution: Occurring west of the Cascades crest, in the Columbia River Gorge, and in the northeastern counties in Washington; British Columbia to California, east to Idaho and Montana, and in all other areas of North America except the southern Rocky Mountain states.
Habitat: In forest understory and on forest edge, often in deep soil, at low to moderate elevations.
Origin: Native
Flowers: May-August
Indian-poke (Veratrum viride)
Distribution: Widely distributed throughout the forest and mountainous areas of Washington; Alaska south to California, east to the northern Rocky Mountains; eastern North America from Alabama to Newfoundland.
Habitat: Moist meadows and woodlands, lowlands to subalpine.
Origin: Native
Flowers: June-September
Indian-strawberry (Duchesnea indica)
Distribution: Introduced west of the Cascades, British Columbia to California, and in the east, Nebraska to New York south to Texas to Florida
Habitat: Ornamental, occasionally escapes
Origin: Introduced
Flowers: May - June
False indigo-bush (Amorpha fruticosa)
Distribution: Occurring chiefly east of the Cascades crest and along the Columbia River in Washington; Washington to California, east across much of North America, including eastern Canada.
Habitat: Disturbed areas, roadsides, wastelots, and often along streams, rivers and other riparian corridors.
Origin: Introduced from eastern North America, where native
Flowers: May-July
Indian ink (Blitum capitatum)
Distribution: In scattered locations in Washington, chiefly east of the Cascades crest; Alaska south to California, east to the Atlantic Coast primarily in the northern half of North America.
Habitat: Weedy native of low to moderate elevations.
Origin: Native
Flowers: June-August
White inside-out-flower (Vancouveria hexandra)
Distribution: Occurring west of the Cascades crest in Washington; Olympic Peninsula in Washington to northern California.
Habitat: Moist, shady forest understory to relatively dry forest edge from low to middle elevations in the mountains.
Origin: Native
Flowers: May-June
Inula (Inula helenium)
Distribution: Known in Washington from a single location east of the Cascades crest in Washington; British Columbia to California, also in central and eastern North America.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas at low elevations.
Origin: Introduced from Asia
Flowers: June-September
Bearded iris (Iris germanica)
Origin: Introduced from southern Europe
German iris (Iris germanica)
Origin: Introduced from southern Europe
Pale yellow iris (Iris pseudacorus)
Distribution: Occurring on both sides of the Cascades crest in Washington, but more common west of the crest; British Columbia to California, east to Idaho and Montana; also in eastern North America.
Habitat: Wetlands, lake and pond margins, irrigation ditches, backwaters, and other wet places where often disturbed; invasive.
Origin: Introduced from Eurasia
Flowers: May-July
Rocky Mountain iris (Iris missouriensis)
Distribution: Occurring chiefly east of the Cascades crest in Wahington, but also known from the Puget Sound area; British Columbia to California, east to the Rocky Mountains.
Habitat: Common in vernally moist meadows, especially in sagebrush and Ponderosa pine forests.
Origin: Native
Flowers: May-July
Siberian iris (Iris sibirica)
Origin: Introduced
Stinking iris (Iris foetidissima)
Origin: Introduced from Europe
Tough-leaf iris (Iris tenax)
Distribution: Occurring west of the Cascades crest in Washington; Washington to California.
Habitat: Prairies, meadows, open oak and coniferous forests, at low to middle elevations.
Origin: Native
Flowers: April-June
Yellow iris (Iris pseudacorus)
Distribution: Occurring on both sides of the Cascades crest in Washington, but more common west of the crest; British Columbia to California, east to Idaho and Montana; also in eastern North America.
Habitat: Wetlands, lake and pond margins, irrigation ditches, backwaters, and other wet places where often disturbed; invasive.
Origin: Introduced from Eurasia
Flowers: May-July
Gordon's ivesia (Ivesia gordonii)
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
Origin: Native
Flowers: Late June - August
Atlantic ivy (Hedera hibernica)
Origin: Introduced
Common ivy (Hedera helix)
Distribution: Introduced as an ornamental, but freely disseminated by birds and widely established in western Washington and Oregon.
Habitat: Wooded areas at low elevations.
Origin: Introduced
Flowers: May - June
English ivy (Hedera helix)
Distribution: Introduced as an ornamental, but freely disseminated by birds and widely established in western Washington and Oregon.
Habitat: Wooded areas at low elevations.
Origin: Introduced
Flowers: May - June