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The Culver's root (Veronicastrum virginicum) belongs to Scrophulariaceae (the Figwort family). It is a perennial herb that is native to the eastern United States and southeastern Canada. It grows in moist prairies and wet meadows and is 60 to 180 cm tall. The leaves are lanceolate to broadly lanceolate or elliptic, dark green, and arranged in whorls around the stem. The small white to pale blue tubular flowers bloom in June to August in compound conical inflorescences. Stamens protrude long from the corolla. The common name was to honour Dr. Culver, a pioneer physician of the late 17th and early 18th century, who used the root for its purgative properties (as a laxative) and to induce vomiting. Nowadays, there are numerous garden varieties.
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