Specimens of Hiraea (Malpighiaceae) from the Brazilian states of
eastern Minas Gerais, Rio de Janeiro, Paraná, and Santa Catarina that
had been determined as H. cuneata Griseb. and H.
wiedeana A.Juss. were found to include four undescribed species.
The assemblage traditionally named Hiraea cuneata includes, in
addition to H. cuneata (Minas Gerais, Rio de Janeiro), two
novelties: H. hatschbachii C.E.Anderson (Paraná) and
H. occhionii C.E.Anderson (Rio de Janeiro). The gatherings
labelled Hiraea wiedeana comprise specimens of H.
reitzii C.E.Anderson (Paraná, Santa Catarina) and
H. restingae C.E.Anderson (Rio de Janeiro), here newly
described, and of H. macrophylla (Colla) P.L.R.Moraes
& Guglielmone (Rio de Janeiro), the earlier and correct name for the
species also known as H. wiedeana. In all, the flowers are
borne in a single 4-flowered umbel instead of a compound arrangement, as is
often characteristic of other species of Hiraea. Specimens
assigned to Hiraea cuneata have the laminas abaxially sericeous
initially but glabrous at maturity. In those assigned to Hiraea
wiedeana the laminas are abaxially velutinous (eventually glabrescent
in H. restingae). Full descriptions and synonymies are
supplied, and all species are illustrated.