Comparison and variation of leaf width and length, bulb diameter and tepal length (flower size) of L. wulingensis (A1–A3), L. × haywardii (B1–B3) and L. radiata (C1–C3). In the boxplot, the horizontal line shows the median, the bottom and top of the box show the first and third quartiles. Boxplot marked with different letters differ significantly (post hoc test, P < 0.05).