Zygophyllaceae
Creosote-Bush Family
2 genera
2 species
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Tribulus terrestrispuncture vine
Distribution: East of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Noxious weed of sandy soils and roadsides.
Origin: Introduced
Flowers: May-September
Zygophyllum fabagoSyrian bean-caper
Distribution: Occurring east of the Cascades in Washington; Washington south to California, eastward in scattered localities to the Atlantic Coast.
Habitat: Disturbed soil and wasteland.
Origin: Introduced from Old World
Flowers: June-August