| A taxonomic revision of Lescuraea Bruch & Schimp. in B. S.G. (including Pseudoleskea Bruch & Schimp. in B.S.G) identifies seven species in North America, with infraspecific variation encompassed by six described varieties. New synonymy is proposed for Lescuraea radicosa var. pallida, synonymy of L. julacea with L. saxicola by Noguchi et al. (1991) is conferred, Pseudoleskea arizonae is reassigned to Pseudoleskeella, the new combination Rigodiadelphus bailevi is presented, and conservation of Lescuraea radicosa is suggested. An infrageneric classification of Lescuraea is proposed, with subgenera Lescuraea and Pseudoleskea accommodating one and six species, respectively. Eleven taxa examined from outside North America are removed from Lescuraea. A revision of an additional 16 taxa would complete a monograph of Lescuraea . A species phylogeny of all accepted taxa in Lescuraea is warranted. The phytogeography of the Holarctic genus Lescuraea is examined, with the greatest centres of diversity for species of Lescuraea being in North America and in Europe. |
