1. Albert, V. A., Mishler, B. D., Chase, M. W., 1992: Character-state weighting for restriction site data in phylogenetic reconstruction, with an example from chloroplast DNA. ? InSoltis, P. S., Soltis, D. E., Doyle, J. J., (Eds): Molecular systematics of plants, pp. 369?403. ? New York: Chapman & Hall.
2. Baum, D. A., Sytsma, K. J., Hoch, P. C., 1994: The phylogeny ofEpilobium L. (Onagraceae) based on nuclear ribosomal ITS sequences. ? Syst. Bot.19: 363?388.
3. Behnke, H.-D., 1989: Sieve-element plastids, phloem proteins, and the evolution of flowering plants. IV.Hamamelidae. ? InCrane, P. R., Blackmore, S., (Eds): Evolution, systematics, and fossil history of theHamamelidae,2: ?Higher?Hamamelidae. ? Syst. Assoc. Spec. Vol.40-A, pp. 105?128. ? Oxford: Clarendon Press.
4. Berg, C. C., 1977:Urticales, their differentiation and systematic position. ? Pl. Syst. Evol., Suppl.1: 349?374.
5. , 1989: Systematics and phylogeny of theUrticales. ? InCrane, P. R., Blackmore, S., (Eds): Evolution, systematics, and fossil history of theHamamelidae,2: ?Higher?Hamamelidae. ? Syst. Assoc. Spec. Vol.40-B, pp. 193?220. ? Oxford: Clarendon Press.