Rhamnaceae
Buckthorn Family
3 genera
8 species
5 subspecies and varieties
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Ceanothus cuneatuscommon buckbrush, narrow-leaf buckthorn, sedge-leaf buckthorn
Distribution: Occurring in scattered locations east of the Cascades crest in Washington, where possibly introduced; otherwise from Willamette Valley in Oregon to California.
Habitat: Foothills, in dry, open areas.
Origin: Native?
Flowers: May-June
Growth Duration: Perennial
var. cuneatus – common buckbrush, narrow-leaf buckthorn, sedge-leaf buckthorn
Ceanothus integerrimusdeerbrush
Distribution: East of the Cascades in Washington along and near the Columbia; Washington south to Baja California.
Habitat: Dry, open forests and open areas at low to moderate elevations.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Ceanothus prostratusprostrate ceanothus, Mahala mat
Distribution: Occurring east of the Cascades crest in south-central Washington; southern Washington to California, east to Idaho and western Nevada.
Habitat: Drier open woods, moderate to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Ceanothus sanguineusredstem ceanothus, Oregon teatree
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California, east to western Montana.
Habitat: Moist to dry open forest, slopes, and thickets, from low to middle elevations.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Ceanothus velutinusmountain balm, greasewood, sticky-laurel, tobacco-brush
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California, east to Alberta, South Dakota, Wyoming, and Colorado.
Habitat: Moist to dry open forests, low to mid-elevations in the mountains.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
var. laevigatus – mountain balm, greasewood, sticky-laurel
var. velutinus – mountain balm, greasewood
Frangula purshianabuckthorn, false buckthorn, cascara
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Idaho and Montana.
Habitat: Forest understory and margins from low to moderate elevations in the mountains.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
ssp. purshiana – buckthorn, cascara
Rhamnus alnifoliaalder-leaf buckthorn
Distribution: Occurring in the northeast corner of Washington; British Columbia east to Quebec, east of the Cascades to Idaho, Montana and the central Sierra Nevada of California.
Habitat: Moist ground, expecially along streams, at moderate to mid-elevations in the mountains.
Origin: Native
Flowers: June-July
Growth Duration: Perennial
Rhamnus catharticacommon buckthorn
Origin: Introduced