A description of the defining characteristics of Gardenia (Rubiaceae) and a revision of the Philippine species distinguished mainly by calyx morphology are presented.
A key to fives ชนิด of Gardenia recognised for the Philippines, full descriptions and illustrations, and a list of names which should be excluded from Gardenia are given.
Relevant Philippine
names for which holotypes were not indicated or have been destroyed are lectotypified.
Two new endemic species, Gardenia ornata K.M.Wong and G. vulcanica K.M.Wong,
are described. Gardenia elata Ridl. and G. mutabilis Reinw. ex Blume are newly applied to
Philippine species previously enumerated under other names. Gardenia pseudopsidium
(Blanco) Fern.-Vill. is considered a doubtful name, to which some authors have referred
the endemic G. barnesii Merr.