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Weed Description: A summer annual with divided leaves and showy yellow and purple flowers. Venice mallow is primarily a weed of agronomic and nursery crops that is found throughout the eastern half of the United States. |
Venice Mallow: Hibiscus trionum
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Weed Description: A summer annual with divided leaves and showy yellow and purple flowers. Venice mallow is primarily a weed of agronomic and nursery crops that is found throughout the eastern half of the United States. |
| Seedling: 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. |  |
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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. |
| Flowers: 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. |  |
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Fruit: A round, hairy capsule that is surrounded by the sepals. |
| Identifying Characteristics: 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. |  |