The halos are rings at the bases of the flowers’ petals. Sometimes, they’re visible to us, especially if the petals are dark. But in most cases, they’re so faint that we can’t see them.

These multi-colored flowers are the result of years of research by Fu Donghui, a professor at Jiangxi Agricultural University, whose team has cultivated 38 species in 22 colors.[Photo/Xinhua] ...

“Roses – known as the ‘queen of flowers’ – belong to the genus Rosa in the Rosaceae family,” the team said in a paper published in the peer-reviewed journal Nature Plants on April 4.