Arthur John Cronquist (1919–1992) was a
United States biologist,
botanist and a specialist on
Compositae. He is considered one of the most influential botanists of the 20th century, largely due to his formulation of the
Cronquist system. Two plant genera in the aster family have been named in his honor. These are
Cronquistia, a possible synonym of
Carphochaete, and
Cronquistianthus, which is sometimes included as a group within
Eupatorium. The former was applied by R.M. King and the latter by him and
Harold E. Robinson.