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...Arthur lyman john cronquist was a united states botanist and specialist on compositae he is considered one of the most influential botanists th century largely due to his formulation system classification basis this an elaboration bessey s refinement over takhtajan which based morphological anatomical embryological palynological serological cytological chemical as well ultra structural evidences according angiosperms have been divided into two classes taxonomic flowering plants it developed by in texts integrated evolution nd edition places broad magnoliopsida dicotyledons liliopsida monocotyledons within these related orders are grouped subclasses scheme still widely used either original form or adapted versions but some adopting angiosperm phylogeny group for families apg iii laid out counts class subclass magnoliidae mostly basal dicots hamamelidae caryophyllidae dilleniidae rosidae asteridae...