picris: genus of weedy Old World yellow-flowered herbs usually containing a bitter-tasting substance: bitterweed
asterid dicot genus: genus of more or less advanced dicotyledonous herbs and some trees and shrubs
calcium blocker: any of a class of drugs that block the flow of the electrolyte calcium (either in nerve cell conduction or smooth muscle contraction of the heart); has been used in the treatment of angina or arrhythmia or hypertension or migraine