Fig. 1

Morphology, density, and length of flower trichomes in ‘Damaohua’ and ‘Yujin 1’. a ‘Damaohua’ L. japonica plant. b ‘Yujin 1’ L. japonica plant. c The morphology of flowers in seven developmental stages of two L. japonica varieties.. d The morphology of flower trichome at the two white stages (S3) in ‘Damaohua’ (bar = 50 μm). e The morphology of flower trichome at the two white stages (S3) in ‘Yujin 1’ (bar = 50 μm). f The arrangement of trichomes on buds or flowers samples at six flowering stages of ‘Damaohua’ and ‘Yujin 1’ by SEM (bar = 1 mm). g Comparison of the density of glandular and non-glandular hairs in ‘Damaohua’ and ‘Yujin 1’. h Comparison of the lengths of glandular and non-glandular hairs in ‘Damaohua’ and ‘Yujin 1’. The annotations of the column color are the same as g’s. Data are presented as the mean ± standard error (SE), n = 5. *p < 0.05, **p < 0.01