为了解 17 种（含种下分类单位）引入植物在广州地区的 越夏能力，通过植物的田间生长状态、叶绿素含量、叶面温度等 指标进行耐热性分析。实验结果表明，聚类分析（Ward 最小方 差）将 17 种引入植物分为耐热类群和不耐热类群，耐热类群在 高温环境下性状较为稳定，包括柳枝稷 Panicum virgatum 、萱草 Hemerocallis fulva 、雄黄兰 Crocosmia × crocosmiiflora 、穗花牡 荆 Vitex agnus-castus 、山桃草 Oenothera lindheimeri 5 种植物， 适应广州夏季的高温高湿环境；其余 12 种植物归属不耐热类群， 在高温高湿环境下容易出现叶片失绿变黄、萎蔫等症状，长势较 差，耐热性一般。

In order to understand the over-summer ability of 17 introduced plants in Guangzhou, the heat tolerance analysis was carried out based on the field growth status, chlorophyll content, leaf temperature and other indicators of the plants.The experimental results showed that the 17 introduced plants were divided into heat tolerant groups and heat intolerant groups through cluster analysis (Ward minimum variance). The heat tolerant group has stable characteristics under the high temperature and high humidity environment of Guangzhou in summer, including Panicum virgatum , Hemerocallis fulva , Crocosmia × crocosmiiflora ,Vitex agnus-castus and Oenothera lindheimeri. The remaining 12 species of plants are heat intolerant groups, which are prone to symptoms such as yellowing and wilting of leaves under high temperature and high humidity environment, and their growth is poor and heat tolerance is average.

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