Diodia
noun
Di·o·dia
dīˈōdēə
: a genus of mostly American weedy herbs of the family Rubiaceae with opposite leaves and small tubular solitary axillary flowers see buttonweed sense 1
Word History
Etymology
New Latin, from Greek diodos thoroughfare (from dia- + hodos way) + New Latin -ia; from the frequent growth of these plants by the wayside