Most of the flowers in nature are red, orange and yellow. If we have seen a black flower, it's chance in a million.
People have made a survey to colors of more than four thousand kinds of flowers and discovered that only eight of them are black.
As we know, sunlight is formed by seven different colored lights. The wavelength of each light is also different, so the quantity (量）of heat in each light is also different. Flowers, especially their petals (花瓣), are easy to be harmed by high temperature.
Black flowers can take in the light of all the wavelengths that make them dry up because of high temperature, so black flowers can hardly resist (抵抗）sunlight. But red, orange and yellow flowers can protect themselves from sunlight by reflecting (反射) the red light, orange light and yellow light, each of which has a large quantity of heat.
