1. Polygonaceae;Brandbyge,1993
2. Polyploidy in arctic plants;Brochmann;Biol. J. Linn. Soc.,2004
3. Universal primers for amplification and sequencing a noncoding spacer between the atpB and rbcL genes of chloroplast DNA;Chiang;Bot. Bull. Acad. Sin.,1998
4. A rapid DNA isolation procedure for small quantities of fresh leaf material;Doyle;Phytochem. Bull.,1987
5. Relaxed phylogenetics and dating with confidence;Drummond;PLoS Biol.,2006