James L. Reveal

Taxonomic identity and typification of selected names of North American Potamogetonaceae

Most names in North American Potamogetonaceae have not been typified. Details of typifications are given for 72 names based on North American material published in the genus Potamogeton mainly by North American botanists. All names are reviewed for their nomenclatural validity and legitimacy, and interpreted taxonomically. Holotypes are indicated for 31 names and previously declared lectotypes or neotypes are listed for eight names. Lectotypes are designated for 24 previously untypified names and step-2 lectotypifications are proposed for three names that were based on heterogeneous material. Type material for three Rafinesque names and one proposed by Wood have not been located. An annotated list provides collection data, type status, homotypic synonyms, and currently accepted names. Two names are excluded from Potamogeton, being based on species of Myriophyllum (Haloragaceae).

Lexicon of infrageneric names in Rubus (Rosaceae: Rubeae)

Summary. An attempt is made to summarise the infrageneric nomenclature associated with the bramble genus Rubus, a widely distributed taxon found throughout much of the near-arctic and temperate to subtropical regions of the world. Nearly 550 infrageneric names have been found but the vast literature on this important genus suggests that this lexicon can only be considered an interim report.

New combinations and typifications in Bistorta, Persicaria, Polygonum, and Rumex (Polygonaceae)

New combinations are proposed in anticipation of the Polygonaceae treatment in the forthcoming volume of Intermountain Flora: Polygonum kelloggii var. esotericum, P. kelloggii var. watsonii,Rumex densiflorus var. pycnanthus,R. salicifolius var. utahensis, and R. occidentalis var. tomentellus. Typifications are proposed to facilitate ongoing studies in Polygonaceae and to maintain current usage.