Unrooted neighbor joining tree showing the genetic relationship among accessions of the Amaranthus hybridus complex (A. caudatus, A. cruentus, A. hypochondriacus, and A. hybridus) genotypes based on single nucleotide polymorphism (SNP) marker data. Bootstrap support values are given at each node. Individuals in the tree are identified by their abbreviated species. Amaranthus hybridus accessions are identified with stars (*). The boxed accession, PI 481125, was originally classified as A. caudatus.