Potentilla argentea L., silvery cinquefoil, potentille argentée
Perennial, spreading by seeds; apomictic; prostrate to semi-erect; flowers yellow; throughout, but most common in western Quebec, Ontario, and southward; pastures, lawns, roadsides, and waste places; introduced from Europe.
Potentilla norvegica L., rough cinquefoil, potentille de Norvège
Biennial or short-lived perennial, spreading by seeds; stems 6 inches to 2 feet (15 cm. to 6 dm.) high; flowers yellow; throughout; grain fields, pastures, gardens, open woods, and waste places; native of North America.
Potentilla recta L., sulfur cinquefoil, potentille dressée
Perennial, spreading by seeds; flowering stems 6 to 18 inches (15 to 45 cm.) high; petals sulfer yellow; throughout, but most abundant in western Quebec, Ontario, and southward; pastures, hayfields, roadsides, and waste places; introduced from Europe.
Spiraea alba Du Roi, narrow-leaved meadowsweet, spirée blanche
Perennial shrub, up to 4 feet (12 dm.) high; flowers white; in the eastern half of our area; old fields, roadsides, and waste places; native to North America.
Spiraea tomentosa L., hardhack, spirée tomenteuse
A small erect native shrub from 2 to 4 feet (6 to 12 dm.) high. Petals pink to rose; lower surfaces of leaves covered with dense, wooly, often tan-colored, hairs. Moist locations in meadows, old fields, and pastures in the eastern half of our area.
Click on a photo to view an enlarged image.
| Weed Name | Photo | Weed Name | Photo |
| silvery cinquefoil, potentille argentée (close up) |
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silvery cinquefoil, potentille argentée |  |
| silvery cinquefoil, potentille argentée |  |
silvery cinquefoil, potentille argentée (close up) |
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| silvery cinquefoil, potentille argentée (seedling) |
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rough cinquefoil, potentille de Norvège |  |
| rough cinquefoil, potentille de Norvège (seedling) |
.JPG) |
rough cinquefoil, potentille de Norvège (NC) |  |
| rough cinquefoil, potentille de Norvège and sulfur cinquefoil, potentille dressée (F&M) |
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sulfur cinquefoil, potentille dressée |  |
| sulfur cinquefoil, potentille dressée (in field) |
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sulfur cinquefoil, potentille dressée |  |
| sulfur cinquefoil, potentille dressée |  |
sulfur cinquefoil, potentille dressée (seedling) |
.JPG) |
| narrow-leaved meadowsweet, spirée blanche |  |
hardhack, spirée tomenteuse (NC) |
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