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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Mountain yampah (Perideridia montana)
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Woodland edge, balds, prairies, outcroppings, and vernally wet meadows from the lowlands to middle elevations in the mountains.
Origin: Native
Flowers: July-September
Oregon yampah (Perideridia oregana)
Distribution: Occurring west of the Cascades crest in southwestern Washington; southern Washington to California.
Habitat: Moist to dry meadows and open slopes or flats, from low to moderate elevations.
Origin: Native
Flowers: June-August
Pearl yarrow (Achillea ptarmica)
Distribution: Reported from Washington but no specimens seen; Alaska to Oregon, east in scattered locations across North America to the Atlantic Coast.
Habitat: Roadsides, wastelots, and other disturbed open areas where occasinally escaping from cultivation.
Origin: Introduced from Eurasia
Flowers: May-August
Yarrow (Achillea millefolium)
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast; circumboreal
Habitat: Common in open, dry to somewhat moist areas from low to high elevations; tolerant of disturbance.
Origin: Both native and introduced populations
Flowers: February-October
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: Occurring chiefly east of the Cascades crest in Washington; British Columbia to Oregon, east across most of North America to the Atlantic Coast.
Habitat: Riparian zones, wet meadows, marshes, shores, springs, and moist forest.
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
Yerba buena (Clinopodium douglasii)
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east to Montana.
Habitat: Coniferous woods, from sea level to middle elevations in the mountains.
Origin: Native
Flowers: May-July
English yew (Taxus baccata)
Origin: Introduced from Europe
Pacific yew (Taxus brevifolia)
Distribution: Occurring in forested areas throughout Washington; Alaska to California, east to southeastern Alberta, Idaho, western Montana, and northeastern Oregon
Habitat: Open to deep, usually moist forests, sea level to middle elevations in the mountains
Origin: Native
Cones: August-October
Western yew (Taxus brevifolia)
Distribution: Occurring in forested areas throughout Washington; Alaska to California, east to southeastern Alberta, Idaho, western Montana, and northeastern Oregon
Habitat: Open to deep, usually moist forests, sea level to middle elevations in the mountains
Origin: Native
Cones: August-October