Forms, varieties, ecotypes (2nd try)

Ellen Bart EllenB at
Fri Jun 19 09:38:51 EST 1992

Can someone explain to me the difference between forms, varieties and
ecotypes, and how, a plant taxonomist decides which rank to assign. 
Because plant phenotype can be so variable, are their particular traits
that are used to make this decision?  At what point is a phenotypic
difference "strong" enough to make variety preferable to form?

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