欧亚的一种药草，具有由纽扣形状的白花构成的松散花序和长的灰绿色的叶子，其叶被弄成粉后会使人打喷嚏。
Eurasian herb having loose heads of button-shaped white flowers and long gray-green leaves that cause sneezing when powdered.
下述情形真可谓是自然界的一个莫大讽刺：土壤中能获得的氮肥量往往对植物的生长构成了一个上限，虽然植物的叶子被沐浴在一片氮气的海洋中。
It is one of nature's great ironies that the availability of nitrogen in the soil frequently sets an upper limit on plant growth even though the plants' leaves are bathed in a sea of nitrogen gas.
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