Next-Generation Genome Sequencing of <i>Sedum plumbizincicola</i> Sheds Light on the Structural Evolution of Plastid rRNA Operon and Phylogenetic Implications within Saxifragales oleh Hengwu Ding, Ran Zhu, Jinxiu Dong, De Bi, Lan Jiang, Juhua Zeng, Qingyu Huang, Huan Liu, Wenzhong Xu, Longhua Wu, Xianzhao Kan