Scientific NameMirabilis nyctaginea
Other Common Names:
heartleaf four o'clock
Synonyms (former Scientific Names):
Allionia nyctaginea; Mirabilis collina; Oxybaphus nyctagineus
Roots: Very thick and tuber-like in some places. Stems: Plants usually range from 1 1/2 to 4 1/2 feet in height. Stems are erect and branching. Leaves: Leaves are triangular to triangular-lanceolate in outline, from 1 1/2 to 3 inches long and 1 to 2 inches wide. Leaves occur on petioles that are approximately 3/4 inch or less in length. Leaves have a deep green color and have prominent white midveins.
Erect perennials with tuberous thickened roots that may reach 4 1/2 feet in height. Plants with thick rootstocks and triangular leaves that are dark green in color with prominent white midveins.
Flower Seed Head
Flowers are pink to lavender in color and occur on flower stalks (peduncles) that range from 3 to 10 mm in length.
A gray or brown achene that is 4 to 5 mm long and elliptical.
Wild four-o' clock is primarily a weed of pastures, hay fields, roadsides, and abandoned locations that is found in North Carolina, Kentucky, Virginia, and West Virginia.