田间杂草在长期演化过程中,出现各种各样的性状,人们就依据这些形态特征,对杂草进行分类,进而达到识别的目的。检索表是鉴别杂草不可缺少的工具。检索表编制的方法是用拉马克二岐分类法,就是把一群杂草的相对特征,分成相对应的二个分支,再把每个分支中的相对性状,分成相对应 In the long-term evolution of field weeds, a variety of traits appear, people will be based on these morphological characteristics, weeds classified, and thus achieve the purpose of identification. The search form is an indispensable tool for identifying weeds. The method of searching the table is to use the method of Ramakushiski classification, that is, the relative characteristics of a group of weeds are divided into two corresponding branches, and the relative traits in each branch are divided into corresponding