Allamanda (Allamanda cathartica) is a vigorous ornamental liana of the Apocynaceae family which can grow over 13ft (4m) high. It has large, bright yellow flowers which bloom year round in tropical areas. Their funnel-shaped corolla has five rounded lobes nested in a counterclockwise direction. Their fruity and delicate fragrance should not make you forget that the whole plant contains a caustic white latex.