This
is a large genus of over 40 species consisting
of plants with white colored composite
flowers mainly native to
North America. They are
perennial herbs with opposite or whorled leaves
and showy clusters of small tubular flowers from
which the branched style generally extends. It
was named for Mithridates Eupator, King of
Pontus
Note: This genus has been recently split into
several different genera. Basically, the purple
flowering types called Joe-Pye-Weed now belong
to a separate genus,
Eutrochium.