The adaptive capacity of the four species to high temperature and low humility drop successively from R. przewalskii, R. anthopogonoides, R. capitatum to R. thymifolium.

• 四种杜鹃对高温低湿环境的适应能力从陇蜀杜鹃、烈香杜鹃、头花杜鹃到千里香杜鹃依次降低。