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The flower colors of Yunnan camellia (Camellia reticulata Lindl., Theaceae) were measured using a device that indicates values by the Munsell color system. The device (ColorReader CR-11, Konica Minolta Sensing, Co., Japan) indicates the numbers of three dimensions (H V/C) that specify the petal color. In a wild C. reticulata tree in Chuxiong City, Yunnan Province, China, five flowers (each having 5-8 petals) showed the same color (7.5RP 4/12) with few exceptions at the outermost petals. In five old trees (ages 200-600), the flower colors were indicated as 7.5RP 4/12, 10RP 3/10 and 5RP 4/12 and showed little variation within individuals. Two horticultural cultivars, 'Tali Camellia' and 'Sleeping Beauty', cultivated in the Kunming Botanical Garden, were measured. In 'Tali Camellia', the mode of petal colors in both fully bloomed and senescent flowers was 7.5RP 4/12, the same as in wild C. reticulata. In 'Sleeping Beauty', the petal color of freshly bloomed flowers was 2.5RP 6/10, while 2.5RP 6/8 in older flowers. Both freshly blooming and older flowers of 'Sleeping Beauty' showed the same "hue", however, the mean "value" of petal colors in older flowers was greater than that of freshly blooming flowers, and the mean "chroma" in older flowers was smaller than that of freshly blooming flowers. This device can be useful for outdoor measurement of flower colors for both wild and cultivated Yunnan camellia.