9. Tribe Plucheeae Anderb.
About 28 genera,
about 220 species, nearly worldwide, but most diverse in tropical regions.
small but widely distributed tribe contains species ranging from annual herbs
to trees. Steyermark (1963), Cronquist (1980), Gleason and Cronquist (1963,
1991), Barkley (1986), and most earlier authors treated the Plucheeae as a
subtribe of a broadly circumscribed Inuleae along with genera here classified
in the Gnaphalieae, although some of the tropical genera in the currently
circumscribed Plucheeae originally were classified in the Vernonieae. The
decision to dismember the Inuleae into three smaller tribes has been supported
by recent analyses of molecular data sets (Panero and Funk, 2002) but was
suggested originally based on differences in subtle morphological details, such
as stylar ultrastructure (Bremer, 1987, 1994). This classification remains
somewhat controversial and at least one recent molecular study (Anderberg et
al., 2005) suggested that the Plucheeae may best be considered a subtribe of