关键词: 大花萱草, 灰色关联分析, 观赏价值, 评价

Abstract: Ornamental value and adaptability of 18 varieties of Hemerocallis hybridus were evaluated in Ningbo by gray\|correlation analysis. Evaluation indexes of ornamental value were based on the growth conditions， overall posture， flower type， inflorescence aesthetics， leafage aesthetics and flower ornamental period， etc. Evaluation indexes of adaptability were based on drought resistance， cold resistance， heat resistance， waterlogging tolerance， disease and pest resistance， etc. The results showed that from the point of ornamental value， the correlation degrees of x4， x3， x8， x2， x5 and x1 to ideal species were more than 071 and from the point of adaptability， the correlation degrees of x5， x8， x2 and x3 to ideal species were more than 083. The species of x2， x3， x5， x8， x6 and x13 could be used for landscape because they have good ornamental value and adaptability and are accord with the traditional attitudes and landscape design requirements. The study of the evaluation method has a certain guiding significance for screening and heterosis utilization of Hemerocallis hybridus.

Key words: Hemerocallis hybridus, gray-correlation analysis, ornamental value, evaluation