Like Ipomoea × multifida, it is known as cardinal climber.
References
Media related to Ipomoea sloteri at Wikimedia Commons
^Eckenwalder, J.E.; Brown, B.P. (1986). "Polyploid speciation in hybrid morning glories of Ipomoea L. sect. Quamoclit Griseb". Canadian Journal of Genetics and Cytology. 28 (17–20): 17–20. doi:10.1139/g86-004.