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Notes on Two Alien Taxa of Rumex L. (Polygonaceae) Naturalized in the Hawaiian Islands 1

During his stay at the National Museum of Natural History, Smithsonian Institution, Washington DC (US), in October 1995, the senior author studied specimens of alien taxa of the genus Rumex L. (Polygonaceae) collected in the Hawaiian Islands. As a result of these studies, 2 taxa new for the archipelago were discovered in the US collections, and among the BISH specimens sent on loan, one of which (Rumex conglomeratus Murray) was briefly reported in last year’s HBS Records (Wagner et al., 1997). Here we report an additional subspecies of R. crispus naturalized in the archipelago, give descriptions of both species, and provide a revised key to all of the species of Rumex in the Hawaiian Islands. Abbreviations in the key follow Wagner et al. (1990).