Are there elms in Nanjing?

Yes

According to the article "Study on Flora and Plant Resources of Nanjing Purple Mountain", the FAGACEAE plants in Purple Mountain include chestnut, Li Mao, Castanopsis sclerophylla, Cyclobalanopsis glauca, Quercus variabilis, Quercus acutissima, Quercus albiflora, Quercus acutissima, Quercus brevicaudata, Quercus microphylla and Quercus acutissima. Yuqianshu