The Polygonaceae (40-50 genera and approximately 1,100 species) are characterized by the presence of an ocrea, an hyaline or membranous tubular sheath, derived from the fusion of the stipules. Their classifi cation is based principally on macromorphological characters. The broad Poly- gonum s.l. is a much debated genus which has been variously interpreted in the literature: its relation to associated genera is not clear and moreover, it has been subdivided into numerous more natural taxa considered at the rank of genus, subgenus or section. In the present study, using analysis of the rbcL sequence the monophyly of the various taxa that Polygonum s.l. has been subdivided are investigated by focusing on the species present in Europe in order to reach a classifi cation more in line with the molecular data. The phylogenetic tree obtained with the maximum parsimony method confi rms that Polygona- ceae is monophyletic, however, the subfamily Polygonoideae seems to be paraphyletic as it includes the Eriogonoideae. On the basis of the principal clades identifi ed the restriction of the Polygonoideae to only those taxa with an herbaceous habit is confi rmed and a new classifi cation articulated in 4 tribes is proposed: 1) Polygoneae, subdivided into Polygoninae (Atraphaxis, Polygonum -incl. Polygonella- and, probably, Calligonum, Oxygonum, Parapteropyrum and Pteropyrum) and Reynoutriinae (Fal- lopia, Homalocladium, Muehlenbeckia, ×Reyllopia, Reynoutria) as well as an incertae sedis genus (Knorringia); 2) Persicarieae, subdivided into Persicariinae subtrib. nov. (Persicaria) and Koenigii- nae (Aconogonum, Bistorta, Koenigia, Rubrivena); 3) Fagopyreae (Fagopyrum, Harpagocarpus and, probably, Eskemukerjea and Pteroxygonum); 4) Rumiceae (Emex, Oxyria, Rheum, Rumex). Lastly new combinations and/or new names are proposed in the genus ×Reyllopia, Persicaria and Rubrivena
Galasso, G., Banfi, E., De Mattia, F., Grassi, F., Sgorbati, S., Labra, M. (2009). Molecular phylogeny of Polygonum L. s.l. (Polygonoideae, Polygonaceae), focusing on European taxa: preliminary results and systematic considerations based on rbcL plastidial sequence data. ATTI DELLA SOCIETÀ ITALIANA DI SCIENZE NATURALI E DEL MUSEO CIVICO DI STORIA NATURALE DI MILANO, 150, 113-148.
Molecular phylogeny of Polygonum L. s.l. (Polygonoideae, Polygonaceae), focusing on European taxa: preliminary results and systematic considerations based on rbcL plastidial sequence data
Grassi F;
2009
Abstract
The Polygonaceae (40-50 genera and approximately 1,100 species) are characterized by the presence of an ocrea, an hyaline or membranous tubular sheath, derived from the fusion of the stipules. Their classifi cation is based principally on macromorphological characters. The broad Poly- gonum s.l. is a much debated genus which has been variously interpreted in the literature: its relation to associated genera is not clear and moreover, it has been subdivided into numerous more natural taxa considered at the rank of genus, subgenus or section. In the present study, using analysis of the rbcL sequence the monophyly of the various taxa that Polygonum s.l. has been subdivided are investigated by focusing on the species present in Europe in order to reach a classifi cation more in line with the molecular data. The phylogenetic tree obtained with the maximum parsimony method confi rms that Polygona- ceae is monophyletic, however, the subfamily Polygonoideae seems to be paraphyletic as it includes the Eriogonoideae. On the basis of the principal clades identifi ed the restriction of the Polygonoideae to only those taxa with an herbaceous habit is confi rmed and a new classifi cation articulated in 4 tribes is proposed: 1) Polygoneae, subdivided into Polygoninae (Atraphaxis, Polygonum -incl. Polygonella- and, probably, Calligonum, Oxygonum, Parapteropyrum and Pteropyrum) and Reynoutriinae (Fal- lopia, Homalocladium, Muehlenbeckia, ×Reyllopia, Reynoutria) as well as an incertae sedis genus (Knorringia); 2) Persicarieae, subdivided into Persicariinae subtrib. nov. (Persicaria) and Koenigii- nae (Aconogonum, Bistorta, Koenigia, Rubrivena); 3) Fagopyreae (Fagopyrum, Harpagocarpus and, probably, Eskemukerjea and Pteroxygonum); 4) Rumiceae (Emex, Oxyria, Rheum, Rumex). Lastly new combinations and/or new names are proposed in the genus ×Reyllopia, Persicaria and Rubrivena
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