Rhizobium helanshanense Qin et al. 2012 Qin W. Deng Z.S. Xu L. Wang N.N. Wei G.H. Rhizobium helanshanense sp. nov., a bacterium that nodulates Sphaerophysa salsula (Pall.) DC. in China 2012 194 371 378 Archives of Microbiology Arch Microbiol 0302-8933 1432-072X 10.1007/s00203-011-0766-x 22065311