Rosaceae - rose family
 

WeedsPoisonous PlantsHay Fever
Gerald A. Mulligan (Agriculture Canada, Ottawa, retired)
Click here to go to Weed Photos for this family

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.

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Weed Name Photo Weed Name Photo
silvery cinquefoil, potentille argentée
(close up)
silvery cinquefoil, potentille argentée
silvery cinquefoil, potentille argentée silvery cinquefoil, potentille argentée
(close up)
silvery cinquefoil, potentille argentée
(seedling)
rough cinquefoil, potentille de Norvège
rough cinquefoil, potentille de Norvège
(seedling)
rough cinquefoil, potentille de Norvège (NC)
rough cinquefoil, potentille de Norvège and sulfur cinquefoil, potentille dressée
(F&M)
sulfur cinquefoil, potentille dressée
sulfur cinquefoil, potentille dressée
(in field)
sulfur cinquefoil, potentille dressée
sulfur cinquefoil, potentille dressée sulfur cinquefoil, potentille dressée
(seedling)
narrow-leaved meadowsweet, spirée blanche hardhack, spirée tomenteuse
(NC)