The high genetic diversity of plants can be a problem when developing molecular methods that require conserved DNA sequences among species. Several chloroplast DNA (cpDNA) regions have been used for the identification of plant DNA from broad taxonomic groups, but many species fail to amplify due to genetic variation at primer-binding sites. Here, we evaluated the conservation degree of four chloroplast DNA (cpDNA) regions commonly used in plant investigations (atpF-atpH, psbA-trnH, trnL CD and trnL GH). We propose new conserved PCR primers for the study of the most common plant families, designed using consensus sequences obtained from 28 multiple sequences alignments with over 11,000 reference sequences. The new primers were able to amplify all target regions in representative samples from the seven families. The conserved genomic regions and PCR primers can be used in diverse areas of plant research, including DNA barcoding, molecular ecology, metagenomics or phylogeny.