The Collaborative International Dictionary
Quinquelobate
Quinquelobate \Quin`que*lo"bate\, Quinquelobared \Quin`que*lo"ba*red\, a. [Quinque- + lobate, -ated: cf. F. quinqu['e]lob['e].] Cut less than halfway into portions, usually somewhat rounded; five-lobed; as, a quinquelobate leaf or corolla.
Wiktionary
quinquelobate
a. Having five lobes.