@article {6902, title = {Diversification rates in a temperate legume clade: are there so many species of Astragalus (Fabaceae)?}, journal = {Amer. J. Bot.}, volume = {83}, year = {1996}, month = {1996///}, pages = {1488 - 1502}, url = {http://www.botany.wisc.edu/courses/botany_940/03KeyInnovations/papers/Sanderson}, author = {M.J. Sanderson and M.F. Wojciechowski} }