Hibiscus known by its scientific name Hibiscus sabdariffa, particularly the flower. Hibiscus tea is ruby red or deep magenta in color and has a sour taste. It is prepared by boiling parts of the hibiscus plant. It is a very popular beverage throughout the world and is often used as a medicinal tea. Hibiscus flowers have various names and are known as “Roselle” in some places. It is widely available in the market throughout the tea-drinking world and can be consumed hot or cold depending on your preference. This tea is low in calories and is caffeine-free.