Verbe'na hasta'ta, Verbena, Blue Vervain. -- Verbenaceae. The dried overground portion, collected when flowering; N. America. Perennial roughish, pubescent, 1-2.5 M. (3-7 degrees) high; in broken or cut pieces; stem stout, quadrangular, rough, pubescent; leaves opposite, 7-15 Cm. (3-6') long, lanceolate, acute, serrate, lobed, deep green, petiolate; flowers panicles, spikes; corolla salver-form, 5-lobed, bright blue, didynamous; fruit 4-seeded, 4 nutlets at maturity; odor heavy, taste bitter, astringent, disagreeable; contains bitter glucoside, tannin; solvent: water. Diaphoretic, expectorant, nauseant, antiperiodic, similar to eupatorium. Dose, gr. 15-30 (1-2 Gm.). Fluidextract (dil. alc.); Infusion, 5 p.c.