Practice question

Carolus Linnaeus Systema Naturae and Species Plantarum classified flowering plants into twenty-four classes based solely on number, length and union of stamens such as Monandria single stamen, Diandria two, Polyandria many and subclasses based on pistils. Using limited sexual characters it constitutes classical artificial system despite immense contribution of binomial nomenclature and hierarchical ranks. Natural system Bentham Hooker used multiple correlated characters, phylogenetic Engler Prantl used evolutionary descent, numerical Sokal Sneath equal weighted phenetics. Artificial nature explains grouping of monocots with dicots having same stamen number, highlighting its heuristic key purpose rather than natural relationship reflection.