This woody vine is filling the canopy of the glasshouse corridor with a mass of violet flowers.
A native of northern South America the woody, twining stems of this species can climb to 12m in height through neighbouring vegetation. A member of the Verbena family, Petrea volubilis, or purple wreath, has salver-form, violet flowers, each with 5 petal lobes. These sit amidst a pale lilac calyx of modified sepals. These are borne to great effect in arching panicles 35cm in length.