In order to screen the cold-resistant structural indexes of five Michelia species (Michelia macclurei, Michelia 'Danxia', M. crassipes, Michelia 'Yuxia' and M. yunnanensis) and evaluate their cold-resistance according to the leaf anatomy, nine structural indicators such as thickness were measured at three temperature nodes (normal temperature, natural cooling and low-temperature wintering). We selected cold-resistant structural indexes by clustering analysis and principal component analysis, and used the membership function method to evaluate the cold-resistance of five Michelia species. The r...
