Rebecca T. Kimballa, Daniel J. Crawford (2004), "Phylogeny of Coreopsideae (Asteraceae) using ITS sequences suggests lability in reproductive characters", Molecular Phylogenetics and Evolution, 33 (1): 127–139, Bibcode:2004MolPE..33..127K, doi:10.1016/j.ympev.2004.04.022, PMID15324843
Rebecca T. Kimballa, Daniel J. Crawford (2004), "Phylogeny of Coreopsideae (Asteraceae) using ITS sequences suggests lability in reproductive characters", Molecular Phylogenetics and Evolution, 33 (1): 127–139, Bibcode:2004MolPE..33..127K, doi:10.1016/j.ympev.2004.04.022, PMID15324843
Rebecca T. Kimballa, Daniel J. Crawford (2004), "Phylogeny of Coreopsideae (Asteraceae) using ITS sequences suggests lability in reproductive characters", Molecular Phylogenetics and Evolution, 33 (1): 127–139, Bibcode:2004MolPE..33..127K, doi:10.1016/j.ympev.2004.04.022, PMID15324843