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. 2021 Nov 1;8:235. doi: 10.1038/s41438-021-00666-0

Fig. 1. Floral phenotypes and color indices of tree peony cultivars “High Noon” and “Roufurong” at five different blooming stages.

Fig. 1

a Floral phenotype of “High Noon”. b Floral phenotype of “Roufurong”. c Color indices of “High Noon”. d Color indices of “Roufurong”. S1: Stage 1, unpigmented tight bud; S2: Stage 2, slightly pigmented soft bud; S3: Stage 3, initially opened flower; S4: Stage 4, half opened flower; S5: Stage 5, fully opened and pigmented flower with exposed anthers. L* represents the brightness; the color becomes brighter as the value increases. C* represents chroma; the color saturation increases as the value rises. h represents the hue angle, defined as follows: 0° (360°) for purple–red, 90° for yellow, 180° for blue–green, and 270° for blue69. a* and b* represent the redness and yellowness, respectively