Powell R F, Smith E B
Arch Dermatol. 1978 May;114(5):751-4.
Russian thistle (Salsola kali), the most common plant referred to as "tumbleweed" in the western United States, can cause a dermatitis in persons who come into direct contract with it. Tests were conducted to determine the mechanism of this dermatitis. Mechanical contact with plant branches, as well as scratch, patch, and photopatch tests with Russian thistle extract and scratch tests with 1.5% potassium nitrate, a plant constituent, were employed. These tests, along with transparent adhesive tape preparations and a skin biopsy, showed that in nonsensitized persons, dermatitis was due only to mechanical irritation of plant floral bracts. In sensitized individuals, Russian thistle floral bracts pierced the skin and stimulated an urticarial reaction.
俄罗斯刺沙蓬（Salsola kali）是美国西部最常被称为“风滚草”的植物，与它直接接触的人可能会引发皮炎。进行了多项试验以确定这种皮炎的发病机制。试验采用了与植物枝条的机械接触，以及用俄罗斯刺沙蓬提取物进行划痕试验、斑贴试验和光斑贴试验，还用植物成分1.5%的硝酸钾进行划痕试验。这些试验连同透明胶带粘贴法和皮肤活检表明，在未致敏的人当中，皮炎仅仅是由于植物花苞片的机械刺激所致。在致敏个体中，俄罗斯刺沙蓬的花苞片刺破皮肤并引发了荨麻疹反应。
