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a genus of plants of the family Cruciferae. They are annual, biennial, or perennial herbs, covered with downy branched hairs. The leaves are entire and alternate. The flowers are in racemes; the petals are white and deeply separated; the fruit is a silicle. There are seven or eight species, all growing in Eurasia. The USSR has three species; the most widely distributed is hoary berteroa (B. incana), which grows on steppes, hills, and dry slopes, along roads, and as a weed in cultivated fields.,