问荆 Equisetum arvense
（重定向自Field Horsetail）
问荆（学名：Equisetum arvense），又名杉菜，为木贼科木贼属下的一个种。
Field Horsetail
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Equisetum arvense 问荆
（重定向自Field Horsetail）
Equisetum arvense, the field horsetail or common horsetail is a herbaceous perennial plant, native throughout the arctic and temperate regions of the northern hemisphere. It has separate sterile non-reproductive and fertile spore-bearing stems, growing from a perennial underground rhizomatous stem system. The fertile stems are produced in early spring and are non-photosynthetic, while the green sterile stems start to grow after the fertile stems have wilted, and persist through the summer until the first autumn frosts. It is commonly confused with mare's tail, Hippuris vulgaris.
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