Rhamnaceae
Buckthorn Family
3 genera
8 species
5 subspecies and varieties
8 species
5 subspecies and varieties
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Ceanothus integerrimus – deerbrush
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
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 prostratus – prostrate 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
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 sanguineus – redstem 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
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 velutinus – mountain 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
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 purshiana – buckthorn, 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
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 alnifolia – alder-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
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
