The aroma of the flowers remind me of Hibiscus. It blooms in the early evening. I initially thought it was producing the Ivy in the same area.
this flower is called the ‘Four-o-clock’ because the flowers open at about that time. It is Mirabilis jalapa in the Nyctaginaceae, same family as Bougainvillea. It is a commonly grown plant native to Mexico.
Steve Hill, Botanist, SCNPS