根据区域边界内的植物数量，北极地区可以划分成三个植物区系(分别是高北极，低北极和次北极)。
The Arctic region is broken into three floristic zones (High, Low and Sub Arctic), referring to the amount of plant life that exists within the regions' boundaries.
研究了阳曲县植物区系的植物起源、发生和性质，及植物类型组成，并就植物资源，尤其是野生药用植物资源的开发利用提出意见。
This paper studied the plant origins, development and properties, and form in Yangqu county. It also gave opinions on exploitation of plant resources, especially wild medicinal plant resources.
植物志是描述某一特定地区植物区系的书或其他著作。
A flora is a book or other work describing the flora of a given area.
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