Cerastium
cerastium, chickweed, mouse-ear chickweed
11 species
3 subspecies and varieties
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Cerastium arvensestarry cerastium, field chickweed, field mouse-ear chickweed
Distribution: Both sides of the Cascades and in the Blue Mountains in Washington. Widely distributed throughout North America.
Habitat: Coastal cliffs to inland valleys, rocky hillsides, subalpine meadows.
Origin: Native
Flowers: April-August
ssp. strictum – field chickweed
Cerastium beeringianumalpine chickweed
Distribution: Occurring in the Cascade Mountains in Washington; Alaska south to California, east to the Rocky Mountains in the U.S.; east across Canada to the Atlantic coast.
Habitat: Alpine zone, mostly in cirques or on talus.
Origin: Native
Flowers: July-August
Cerastium brachypetalumgray chickweed, gray mouse ear
Origin: Introduced
Cerastium brachypodumshort-stalk mouse-ear chickweed
Origin: Native
Cerastium dichotomumdry chickweed
Distribution: Washington to California.
Habitat: Disturbed areas, especially along roadsides.
Origin: Introduced from southern Europe
Flowers: April-June
Cerastium fontanumcommon mouse-ear chickweed
Distribution: Introduced and common in most of Canada and the United States; more common east of the Cascades
Habitat: Disturbed ground, lawns and gardens
Origin: Introduced from Europe
Flowers: March - September
ssp. vulgare – common chickweed, mouse-ear chickweed
Cerastium glomeratumsticky mouse-ear chickweed
Distribution: Widely distributed throughout Washington, but more common west of the Cascades crest; occurring throughout western and eastern North America.
Habitat: Low elevations in disturbed ground.
Origin: Introduced from Europe
Flowers: March-June
Cerastium nutansnodding mouse-ear chickweed
Distribution: Occurring on both sides of the Cascades in Washington; Alaska south to Oregon, south in the Rocky Mountains to New Mexico and Arizona, east to the Atlantic Coast.
Habitat: Dry to moist banks and woodlands.
Origin: Native
Flowers: April-June
var. nutans – nodding chickweed
Cerastium pumilumdwarf chickweed, dwarf mouse ear
Distribution: Introduced at scattered locations in Washngton.
Habitat: Dry, sandy or gravelly places, roadsides.
Origin: Introduced from Europe
Flowers: April - May
Cerastium semidecandrumlittle chickweed, little mouse ear
Origin: Introduced from Europe
Cerastium tomentosumsnow-in-summer
Distribution: Occasionally escaping cultivation in lowland northwestern Washington; British Columbia to Oregon, east across northern U.S. and southern Canada to Atlantic Coast.
Habitat: Fields, roadsides, waste sites.
Origin: Introduced
Flowers: April-May