Hare's-ear

Hare's-ear (Bupleurum), a genus of plants of the order Umbelliferae, having compound umbels of yellow flowers, and generally simple leaves. The leaves of the most common British species, B. rotundifolium, are perfoliate. This plant, which grows in cornfields in the chalk districts, is the Thorough-wax of the old herbalists. The species of hare's-ear are numerous, and are natives of temperate climates in most parts of the world.