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Perennial pepperweed

Perennial pepperweed. Lepidium latifolium. A 1 – 3 foot tall perennial with waxy leaves, white flowers, and creeping rhizomes. Also known as tall whitetop. Impacts riparian areas and wetlands by forming large dense stands that displace native plants.

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Perennial pepperweed

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  1. Perennial pepperweed Lepidium latifolium A 1 – 3 foot tall perennial with waxy leaves, white flowers, and creeping rhizomes. Also known as tall whitetop. Impacts riparian areas and wetlands by forming large dense stands that displace native plants. Steve Dewey, Utah State University; Leslie J. Mehrhoff, University of Connecticut, Bugwood.org

  2. Purple loosestrife Lythrum salicaria A 8 foot tall semi-aquatic perennial with long, showy, rose-purple flower spikes and square stems. Impacts wetland ecosystems by forming dense stands that displace native plants and impede water flow. Linda Wilson, University of Idaho, Bugwood.org

  3. The Thistles Chris Evans, River to River CWMA, Bugwood.org Forest & Kim Starr, United States Geological Survey, Bugwood.org Steve Dewey, Utah State University, Bugwood.org Mary Ellen (Mel) Harte, , Bugwood.org Bull Cirsium vulgare Scotch Onopordium acanthum Canada Cirsium arvense Musk Cardus nutans

  4. Scotch thistle Onopordum acanthium A 4-8 foot tall annual with purple flower heads and spine tipped stems and leaves. Plants thrive in disturbed areas and can quickly become the dominant vegetation if left unmanaged. Eric Coombs, Oregon Dept. of Agriculture

  5. Canada thistle Cirsium arvense A 1 - 4 foot tall perennial with small purple flowers and prickly leaves. Impacts a wide range of habitats including cropland and riparian areas. Creeping rhizomes can colonize an area 3 - 6 feet in diameter in just a few years. Steve Dewey, Utah State University; Theodore Webster, USDA Ag Research Service, Bugwood.org

  6. Field Bindweed Convolvulus arvensis A twining perennial with white, trumpet-shaped flowers. Impacts a wide variety of habitats including agriculture and home landscapes. Control is often difficult because plants reproduce vegetatively from roots, rhizomes, stem fragments, and by seeds that can lie dormant in the soil for up to 50 years.

  7. Puncturevine Tribulus terrestris A yellow flowering annual that forms dense mats and hard, spiky seed cases that can injure livestock, people, and pets. Long-term control of puncturevine can be achieved by consistently reducing the amount of seed in the soil.

  8. Garlic mustard Alliaria petiolata A 3 foot tall biennial herb with self pollinating white flowers. All plant parts have a distinctive garlic odor when crushed. Impacts forested communities by altering the soil and out competing native plants. Leslie J. Mehrhoff, University of Connecticut, Bugwood.org

  9. Myrtle spurge Euphorbia myrsinites An escaped ornamental containing a caustic sap that can result in skin irritation and swelling. Grows in a range of habitats from shaded oak under stories to sunny slopes. Patrick Nelson, Cottonwood Canyons Foundation

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