Undersireable Plants Known to Occur in the Challis Field Office | | Tumble Pigweed | Amaranthus albaus | | Quackgrass | Agropyron repens | | Cheatgrass | Bromus tectorum | | Blue Mustard | Chorispora tenella | | Meadow Thistle | Cirsium scariosum | | Bull Thistle | Cirsium vulgare | | Tall Larkspur | Delphinium occidentale | | Flixweed | Descurainia Sophia | | Curly cup gumweed | Grindelia squarrosa | | Broom snakeweed | Gutierrezia sarothrae | | Halogeton | Halogeton glomeratus | | Foxtail barley | Hordeum jubatum | | Kochia | Kochia scoparia | | Prickly lettuce | Lactuca serriola | | Russian Thistle | Salsola iberica | | Tumble Mustard | Sisymbrium altissimum | | Medusahead* | Taeniatherum caput-medusae | | Common tansy | Tanacetum vulgare | | Field pennycress | Thlaspi arvense | | Seaside arrowgrass | Triglochin maritima | | Common mullein | Verbascum thapsus | | Meadow deathcamas | Zygadenus venenosus | | *Species likely to infest within 20 years |
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