Selected images for Russian-thistle (Salsola tragus )
Russian thistle is an annual herb that can grow to 4 ft. (1.2 m) tall. It was introduced into the United States in the mid 1870s, possibly as a contaminant in flax seed. Leaves are alternate and narrow. Upper leaves have a sharp point at the apex and are 1.3-2 in. (3-5 cm) long. Flowering occurs from midsummer to fall, when small, pink to greenish flowers develop from the leaf axils. Each flower is subtended by 3, spine-tipped leaves. After the plant matures it detaches from the root system and tumbles in the wind, spreading seed (like another common name “tumbleweed” suggests).
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5159096 Russian-thistle Salsola tragus Plant(s) Forest & Kim Starr |
5162030 Russian-thistle Salsola tragus Flower(s) Forest & Kim Starr |
5162024 Russian-thistle Salsola tragus Flower(s) Forest & Kim Starr |
1363366 Russian-thistle Salsola tragus Plant(s) Mary Ellen (Mel) Harte |
1363367 Russian-thistle Salsola tragus Feature(s) Mary Ellen (Mel) Harte |
1363368 Russian-thistle Salsola tragus Feature(s) Mary Ellen (Mel) Harte |
1459792 Russian-thistle Salsola tragus Seedling(s) Utah State University Archive |
5162022 Russian-thistle Salsola tragus Seed(s) Forest & Kim Starr |
5162018 Russian-thistle Salsola tragus Seedling(s) Forest & Kim Starr |
5162029 Russian-thistle Salsola tragus Plant(s) Forest & Kim Starr |
5162031 Russian-thistle Salsola tragus Infestation Forest & Kim Starr |
5308087 Russian-thistle Salsola tragus Plant(s) USDA PLANTS Database |
