Mirabilis is also known as four o'clocks.
According to the provided reference, the common name "four o'clocks" was given to Mirabilis jalapa because its flowers typically don't open until late in the day. This plant, belonging to the four-o'clock family (Nyctaginaceae), is a tender perennial in Zones 7-10 but is often grown as an annual in most parts of the US.
