Genotype informs phenotype. A phenotype cannot express which is not created by the genotype in response to environment. The two terms are fundamentally linked in a biological sense. The real issue for relative ID is complex. You have a phenotypic range, which is vital, but not enough to ID something as that a hybrid could express a phenotype of say a pachanoi, but be F1 and thus not a true pachanoi even if it passes as one to all observers. If only we could easily culture anthers and produce haploid specimens from our plants in question... My plant physiology teacher would say... Plants have all the anthers.