国产萱草属夜间开花类群的分类研究

在《中国植物志》第14卷中,萱草属Hemerocallis夜间开花类群被处理为3个独立的物种,北黄花菜、黄花菜和小黄花菜。但是,它们之间因严重的性状重叠和交叉,用单个性状如花数、花被管长度、根的直径等区分它们极为困难。本文根据国产干标本和栽培材料,对9个常用检索性状以及核型做了定量分析。另外,这3个类群的地理分布式样表明,它们似乎是不同的地理宗,因为三者替代性分布在由暖湿到旱冷的气候梯度中。本文结论是,将三者处理为同一物种北黄花菜的3个亚种也许更令人信服,即原亚种北黄花菜,亚种黄花菜和亚种小黄花菜。

TAXONOMIC STUDIES ON THE NOCTURNAL FLOWERING GROUP OF HEMEROCALLIS(LILIACEAE) FROM CHINA

The nocturnal-flowering group of Hemerocallis was treated as including three separate species, H. lilioasphodelus, H. citrina and H. minor in the Florae Reipublicae Popularis Sinicae Vol. 14 (1980). However it is difficult to distinguish them from one another by a single feature, such as the flower number, length of perianth tube, diameter of tuberous roots, for they are strongly overlapping. In the present paper, numerical analysis was made of nine morphological characters and karyotype divergences which are of taxonom-ic significance as shown in the study of H.fulva and its two varieties (Xiong and Chen, 1992), based on dry and living materials from China. In addition, geographical distribution pattern of the three taxa studied shows that they seem to be different geographical races or allopatric ecotypes in a topocline, since they inhabit a climate gradient from warm and moist to cold and drought condition. As a result, the present authors tend to consider it more reasonable to treat them as a single species, H. lilioasphodelus, with three subspecies, that is, H. lilioasphodelus ssp. lilioasphodelus, H. lilioasphodelus ssp. citrina (stot, not;) and H. lilioasphodelus ssp. minor (stat. nov. )