Three new species of Ipomoea L. (Convolvulaceae) from Southern Brazil

Ipomoea L. is the most speciose genus of the Convolvulaceae, comprising c. 140 species in Brazil. Three new species are described and illustrated from Rio Grande do Sul and Santa Catarina states: Ipomoea pampeana P. P. A. Ferreira & Miotto, I. riograndensis P. P. A. Ferreira & Miotto and I. sulina P. P. A. Ferreira & Miotto.