2 species
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Physocarpus capitatusPacific ninebark
Distribution: Occurring on both sides of the Cascades crest in Washington, but found chiefly on the west side; Alaska south to California, east to Alberta and Idaho.
Habitat: Moist woods and swamps in the lower mountains.
Origin: Native
Flowers: May-June
Physocarpus malvaceusmallow ninebark, mallow-leaf ninebark
Distribution: Occurring east of the Cascades crest in eastern Washington; British Columbia to Oregon, east to Alberta and Utah.
Habitat: Canyons and hillsides, grasslands, ponderosa pine and Douglas-fir forest openings and edge.
Origin: Native
Flowers: May-July