Cryptobotanists also study botanical oddities such as four-leaf clovers, "witch's brooms" (pathological formations consisting of tightly packed twigs, forming on various trees and shrubs), and irregularly shaped flowers. The biggest surprise, however, was the "Kronenbourg" rose, bred in the summer of 1997 by Jan Kubas, a horticulturist from Leeds, UK. This rose caught the researchers' attention with its bicolored petals—red on the inside and uniformly white on the outside. Experts from the Royal Rose Breeders' Society concluded that in this flower, a long-dormant gene from the original wild rose was most likely activated. However, they could not determine why the gene was activated in only a single shrub, and the mysterious mechanism that caused such a precise distribution of petal colors—half red, half white—also remains unknown.
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