The number of petals in the flowers is a taxonomic character used in the circumscription of the subgenera of Polygala. Until now, the corolla of the species of subgenus Hebeclada was described having tree petals, one inferior and central called carina and two lateral adnated to the staminal sheath. Among the 12 subgenera of Polygala, the occurrence of trimerous corolla was only known in subgenera Polygala and Hebeclada. This paper presents the discovery of pentamerous corolla in species of Polygala subgenus Hebeclada, presenting photos and additional comments about this reduced petals unknown for the subgenus until this moment.
corolla; Polygala; subgenus Hebeclada; Polygalaceae; southern Brazil
