RONSE DECRAENE, L.-P. AND AKEROYD, J. R., 1988. Generic limits in Polygonurn and related genera (Polygonaceae) on the basis of floral characters. In order to investigate the taxonomic value of a number of characters in the elucidation of relationships within the collective genus Polygonurn L., and segregate genera Atraphaxis L., Calligonum L., Pteropyrum Jaub. & Spach., Oxygonurn Burch., Fagofivrurn Mill., Hnrpagocarpus Hutch. & Dandy and Polygonella Michx., 83 species of the tribe Polygoneae emend. Jaretzky were studied. The following floral characters were examined: stamen number, insertion and external morphology; structure and morphology of the floral nectaries; vasculature and surface morphology of the tepals. Problems i n floral morphology in Polygonaceae are discussed, together with relationships within the Family. l'he tribal division proposed by Haraldson (1978) is supported, but a new and different delimitation of genera is proposed. The present data support a division of Polygonurn L. sensu lalo and its related taxa into two tribes: Polygoneae (containing Polygonum L. sensu slriclo, Fallopia Adans., Oxygonum Burch., Pterofivrum Jaub. & Sparh., Atraphaxis L. and Calligonum L.), and Persicarieae (containing Fagopyrurn Mill., Harpagocarpus Hutch. & Dandy, Persicaria Mill. and Koenigia L.). The genus Reynoulria Houtt. is included as a section of Fallopia Adans.; Bislorla Mill,, Aconogonon Reirhenb. and Touara Adans. are included within Persicaria Mill. A number of new combinations are proposed in Persicaria and Fallopia.
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