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Broad-Leaved Pepper-Grass

Broad-leaved pepper-grass
Photo credit: Leslie Mehrhoff, University of Connecticut, Retrieved from Bugwood.org (Image Number: 5480237), used under CC BY 3.0 US, modified from the original

Common Name: Broad-Leaved Pepper-Grass

Scientific Name: Lepidium latifolium

Habitat: grassland, grassland wet, grassland dry, saline open areas, disturbed areas, farmland, roadsides

Provincial Designation: Noxious

Noxious weeds are plant species that are designated as "noxious weeds" in the Alberta weed regulation. Noxious weeds must be controlled, meaning their growth or spread needs to be prevented.

Origin

Native to Europe and West Asia, broad-leaved pepper-grass was introduced to North America in 1936 as a contaminant in crop seed. In California, it was also grown as an ornamental plant.

Legislated Because

Broad-leaved pepper-grass is a highly invasive species that displaces native vegetation. It grows mainly in moist to wet habitats including riparian areas, wetlands, marshes and floodplains.

Description

This weed has tiny 3-8 mm wide, white flowers with four petals. The flowers grow in dense clusters at the tips of branches.

The leaves are green with a leathery surface and a prominent whitish midvein. Leaves are lance-shaped, elliptic or egg-shaped and have smooth or serrated edges. Rosette leaves are larger than stem leaves and often have stalks. Stem leaves are sessile but not clasping.

Each plant has multiple smooth stems that grow up to 120 cm tall.