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For more information about weeds, you may wish to purchase a copy of Weeds of the West (#WYWSWS001). This full color, 630 page publication costs $30 (in 1999) and is available from your local WSU Extension Office or can be ordered from WSU Publications.
Horsetails: The plant is leafless, with a straight, finely-ridged stem with joints at regular intervals without flowers.
Ferns: The stems are not jointed or hollow, leaves large and pinnately dissected, nonflowering.
Grasses: The stems are cylindrical and hollow, leaves are slender with parallel veins.
Sedges: The stems are triangular and solid, leaves in three rows.
Rushes: The stems are round and solid.
Buckwheat family: The plant stem has a paper-like collar at the base of each leaf.
Pigweed, Miner's lettuce and Lambsquarters: The plant has lens-shaped, black or dark brown, shiny seeds.
Pink family: The plant has opposite leaves that appear joined around the swollen joints of the plant stem.
Mustard: The plant has alternate leaves and small four-part flowers in white, yellow, or purple..
Legume: The plant has compound leaves and flowers are typical pea blossom shape, check..
Parsley: The flowers are tiny and in a broad, flat cluster at the ends of the stem.
Spurges, Dogbanes, Milkweeds, and Sunflowers families:The plant has a milky juice.
Borage: The plant stem and leaves are bristly-hairy.
Mint: The plant has a square stem (check by rolling between thumb and finger) and leaves are opposite (paired).
Toadflax: The plant flowers resemble those of snapdragons.
Bedstraw: The plant has a square stem, tiny, white, four-part flowers, and leaves are in whorls (circles) around the plant stem.
Corn spurry: The plant has a round stem and leaves appear to be in whorls (circles) around the plant stem.
Sunflower: The plant has a flower head with many small tube-like flowers clustered on a common base, with an outer row of strap-shaped flowers in some species.
Nightshade: The flower has five star-petals resembling a tomato flower, usually yellow, white or blue, and the fruit is a berry or spiny capsule.
