Antimicrobial Flavonoid from Hibiscus rosa-sinensis Linn. C. Ragasaa & L. Rufino (pp. 12-18) Abstract The air-dried flowers of Hibiscus rosa-sinensis Linn., commonly known as gumamela afforded 5,7,4' trihydroxyflavanone (1), also known as naringenin, and a mixture of hydrocarbons and squalene. …