This section is from the book "Field Book Of Western Wild Flowers", by Margaret Armstrong. Also available from Amazon: Field Book Of Western Wild Flowers.
A rather attractive, smooth, perennial, with a stout, leafy stem, sometimes branching, and the leaves in fours, with three veins, the margins sometimes rough and hairy. The small flowers are white and so numerous as to be quite pretty. The fruit is small, at first bristly, but smooth when ripe. This grows in northern mountains across the continent, also in Europe and Asia, up to ten thousand feet.
Corn-salad-Valerianeilla macrosera. VALERIAN FAMILY. Valerianaceae.
 
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