Origin
Native to Europe and parts of Asia, North America, and North Africa. The United States specifically, is native to Washington, Oregon, California, Montana, and all states north of Tennessee and east of Minnesota except Iowa, Kentucky, and North Carolina.

Appearance
Geranium robertianum is an annual herb that grows from 11.8 to 15.7″ (30-40 cm) tall.

Foliage
Leaves are 2.4″ (6 cm) long, palmate, deeply cut, and often tinged with pink or red coloring. Leaves also release a very pungent odor. The stems are dark red in color and very brittle at joints.

Flowers
Flowers are bright pink, perfect, clustered in groups of 2 to 4, 0.6″ (15 mm) across with 5 rounded petals that have streaks of white. The blooming period occurs in summer.

Fruit
The fruit is long, thin, oval-shaped, 0.67″ (17 mm) long capsules that each contain five small oval dark brown seeds. Fruit ejects the seeds to distances of up to 20′ (6.1 m) when disturbed.

Ecological Threat
G. robertianum grows in shady, damp places in areas like along river banks and roadsides. In the United States, it can be found in Washington, Oregon, California, Montana, and all states north of Tennessee and east of Minnesota except Iowa, Kentucky, and North Carolina.

Selected Images

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Maps

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Invasive Listing Sources

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• Native Plant Society of Oregon, 2008
• Oregon Noxious Weeds
• Pacific Northwest Exotic Pest Plant Council, 1998
• Washington Noxious Weeds
• WeedUS - Database of Plants Invading Natural Areas in the United States

References

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Common Name Reference: Weed Science Society of America Common Names List

Scientific Name Reference: USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.