31. Perideridia Rchb. (Chuang and Constance, 1969)
species, U.S., Asia.
Downie et al.
(2004) recently have shown that the single Asian species included in Perideridia
by some authors, P. neurophylla (Maxim.) T.I. Chuang & Constance, is
only distantly related to the North American members of the genus and should be
reclassified in a different tribe of Apiaceae in the monotypic genus Pterygopleurum