Vascular Plants

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

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Common names beginning with Y:
26 common names
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Bolander's yampah (Perideridia bolanderi)
Distribution: Northeast Oregon and adjacent Idaho, south through eastern Oregon and western Idaho to Nevada and Utah.
Habitat: Dry, open, often rocky hillsides, ridges and dry washes in the foothills and high plains.
Origin: Native
Flowers: July - August
Gairdner's yampah (Perideridia montana)
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Colombia to southern California, east to Saskatchewan, South Dakota and New Mexico.
Habitat: Woodlands and vernally wet meadows.
Origin: Native
Flowers: July-September
Pearl yarrow (Achillea ptarmica)
Distribution: Introduced in Washington to Montana, and northeastern United States
Habitat: Occasionally escaped from cultivation
Origin: Introduced
Yarrow (Achillea millefolium)
Distribution: Both sides of the Cascades in Washington, from the coast to the alpine; circumboreal; widespread throughout North America.
Habitat: Common in open, dry to somewhat moist areas from low to high elevations; tolerant of disturbance.
Origin: Both native and introduced populations
Flowers: April-October
Large-flowered yellow flax (Linum rigidum)
Origin: Native
Little yellow rattle (Rhinanthus minor)
Distribution: Both sides of the Cascades in Washington; Alaska to Newfoundland, south to upper Midwest and New England; circumboreal.
Habitat: Moist meadows, forest openings, and roadsides at low to middle elevations, sometimes in subalpine.
Origin: Native
Flowers: June-August
Yellow rattle (Rhinanthus minor)
Distribution: Both sides of the Cascades in Washington; Alaska to Newfoundland, south to upper Midwest and New England; circumboreal.
Habitat: Moist meadows, forest openings, and roadsides at low to middle elevations, sometimes in subalpine.
Origin: Native
Flowers: June-August
Northwestern yellow-flax (Sclerolinon digynum)
Distribution: East of the Cascades in Washington; Washington south to the Sierra Nevada of California, east to Idaho.
Habitat: Meadows and prairies at low to moderate elevations.
Origin: Native
Flowers: May-July
Fringed yellow-loosestrife (Lysimachia ciliata)
Distribution: Chiefly east of the Cascades crest in Washington; widely distributed throughout most of North America.
Habitat: Moist woods, prairies, meadows, stream banks, roadsides.
Origin: Native
Flowers: June-August
Garden yellow-loosestrife (Lysimachia vulgaris)
Distribution: Occurring in scattered localities on both sides of the Cascades in Washington; British Columbia to Oregon, east to Montana; widely distributed in eastern North America.
Habitat: Uncommon garden escape of moist areas, lake and pond margins, and riparian zones.
Origin: Introduced from Europe
Flowers: June-August
Large yellow-loosestrife (Lysimachia punctata)
Distribution: Scattered localities across Washington; British Columbia south Oregon, east to Montana; scattered throughout central and eastern North America.
Habitat: Old fields, roadsides and stream banks.
Origin: Introduced
Flowers: July-August
Lowland yellow-loosestrife (Lysimachia hybrida)
Origin: Introduced
Tufted yellow-loosestrife (Lysimachia thyrsiflora)
Distribution: Distributed on both sides of the Cascades in Washington; Alaska south to California, eastern North America.
Habitat: Swamps, lakes and ditches.
Origin: Native
Flowers: May-July
Blunt-leaved yellowcress (Rorippa curvipes)
Distribution: Occurring chiefly east of the Cascades in Washington; widely distributed throughout western and central North America.
Habitat: Wet areas including streambanks, lake shores, wet meadows, and ditches.
Origin: Native
Flowers: May-September
Creeping yellowcress (Rorippa sylvestris)
Distribution: Known only from Whitman County in Washington; British Columbia south to Oregon, east across North America to the Atlantic Coast.
Habitat: Disturbed, moist areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: May-August
Hispid yellowcress (Rorippa palustris)
Distribution: Widely distributed throughout Washington; common throughout North America.
Habitat: Wet ground and low elevations.
Origin: Native
Flowers: June-October
Marsh yellowcress (Rorippa palustris)
Distribution: Widely distributed throughout Washington; common throughout North America.
Habitat: Wet ground and low elevations.
Origin: Native
Flowers: June-October
Modoc yellowcress (Rorippa tenerrima)
Origin: Native
Roundfruit yellowcress (Rorippa sphaerocarpa)
Origin: Native
Spreading yellowcress (Rorippa sinuata)
Distribution: Occurring in Klickitat County in Washington; British Columbia south to California, east to central North America.
Habitat: Wet areas including pond and lake margins, stream banks, and ditches.
Origin: Native
Flowers: May-September
Truncate yellowcress (Rorippa curvipes)
Distribution: Occurring chiefly east of the Cascades in Washington; widely distributed throughout western and central North America.
Habitat: Wet areas including streambanks, lake shores, wet meadows, and ditches.
Origin: Native
Flowers: May-September
Western yellowcress (Rorippa curvisiliqua)
Distribution: British Columbia to California, east to Montana and Nevada
Habitat: Stream banks and moist soil, low to mid-elevations in the mountains
Origin: Native
Flowers: May - September
Yellowtuft (Alyssum murale)
Origin: Introduced
English yew (Taxus baccata)
Origin: Introduced from Europe
Pacific yew (Taxus brevifolia)
Distribution: Alaska to California, east to northern Idaho and northeast Oregon
Habitat: Open to deep, usually moist forests, sea level to mid-elevations in the mountains
Origin: Native
Cones: September - October
Western yew (Taxus brevifolia)
Distribution: Alaska to California, east to northern Idaho and northeast Oregon
Habitat: Open to deep, usually moist forests, sea level to mid-elevations in the mountains
Origin: Native
Cones: September - October