English: Northwestern yellowflax.
Genus: 1 species.
Region: western United States, Washington, Idaho, California, Idaho.
Habitat: seasonally wet; mountain meadows, vernal pools.
BotanyAnnual herb.
Stem: hairless, erect; 20 centimeters tall.
Leaves: oval; upper ones with serrated edges; opposite; grow erect
Inflorescence: cyme.
Flowers: surrounded by serrated, leaflike bracts; petals five yellow; calyx of toothed sepals.