flower of an hour
Scientific NameHibiscus trionum
Other Common Names:
Synonyms (former Scientific Names):
Leaves: Alternately arranged along the stem and are approximately 3 inches wide and long. Leaves are divided into at least 3 distinct lobes, but may be divided into as many as 7 lobes. All lobes have margins that are toothed. All leaves occur on long petioles and are without hairs (glabrous) on the upper surface and have hairs on the lower surface. Stems: Erect, hairy, and branching from the base. Roots: A shallow taproot and a fibrous root system
A summer annual with divided leaves and showy yellow and purple flowers.The lobed leaves, membranous sepals that resemble a bladder, and yellow and purple flowers are all characteristics that help in the identification of Venice mallow.
Flower Seed Head
Arise from the position between the stem and leaf petioles (leaf axils). Flowers consist of 5 petals that are pale yellow to white in color with a purple base. The 5 sepals resemble a membranous bladder with distinctive dark green veins.
Cotyledons are round and occur on long hairy petioles. First true leaves are alternate and irregularly shaped with a toothed margins. All subsequent leaves are lobed at least 3 times. fruit is A round, hairy capsule that is surrounded by the sepals.
Venice mallow is primarily a weed of agronomic and nursery crops that is found throughout the eastern half of the United States.
upright and nonwoody,
prostrate and nonwoody
Thorns or Spines
Approximate Flower Diameter
Dominant Flower Color
shorter than leaf,
longer than leaf
Stem Cross Section
round or oval