Ipomoea longistaminea stands out among the species of the genus to be considered as endemic to the Caatinga and restricted distribution to the states of Pernambuco and Bahia. In this work the reproductive biology and floral visitors of this specie were studied in Caatinga area, in São Luiz farm, in Juazeiro, Bahia state. The activities were conducted in the years 2009 to 2012, from May to August, between 5:00 a.m. and 6:00 p.m., with 20 individuals of I. longistaminea. For the study of floral biology, flowers were marked and monitored, and the anthesis and flowers visitors were noted. Pollination experiments were done to determine the reproductive strategy. Ipomoea longistaminea is an annual liana with flowering observed from May to July, characterized as a cornucopian pattern of flowering. The flowers are gathered in cymes, on average 10.6 ± 2.88 buttons. The flowers are infundibuliform with a red corolla and average length of 40.9 ± 3.68 mm. The androecium consists of five stamens, which together with style and stigma, are exposed outside the corolla. The anthesis is diurnal, occurring around 5:00 a.m. and at this stage the stigma is already receptive, pollen is viable (93.4%) and available and nectar is produced in small amount (7.1 ± 2.1 uL). Around 3:00 p.m., the flowers are dried with petals closing the fauce of corolla. During flowering, visits of 05 species of hummingbird and 03 species of bees were recorded. Ipomoea longistaminea is autocompatible and featuring floral traits characteristic of the syndrome ornithophily, where Chlorostilbon sp., Eupetomena macroura and unidentified hummingbird were considered as potential pollinators in the site of this study.