Rhamnaceae
Buckthorn Family
3 genera
6 species
2 subspecies and varieties
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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
Ceanothus prostratusMahala mat, squawcarpet
Distribution: East slope of the Cascades in Washington from , Yakima County south; Washington south to California, east to Idaho and western Nevada.
Habitat: Drier open woods, moderate to mid-elevations in the mountains.
Origin: Native
Flowers: May-July
Ceanothus sanguineusredstem ceanothus, Oregon teatree
Distribution: Widely distributed on both sides of the Cascades in Washington; British Columbia to California, east to Idaho.
Habitat: Moist to dry open woods, low to moderate elevations.
Origin: Native
Flowers: May-July
Ceanothus velutinus
Distribution: Widely distributed on both sides of the Cascades in Washington; British Columbia to California, east to South Dakota and Colorado.
Habitat: Moist to dry open forests, low to mid-elevations in the mountains.
Origin: Native
Flowers: June-September
var. laevigatus – mt. balm, greasewood, sticky-laurel
var. velutinus – mt. balm, greasewood
Frangula purshianabuckthorn, false buckthorn, cascara
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to Montana and Idaho.
Habitat: Forest understory and margins from low to moderate elevations in the mountains.
Origin: Native
Flowers: April-June
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