racemes, axillary or terminal, with short pedicels, 5-8 mm long, and 2-8 flowers per pedicel. The cauliflower bean flower is a butterfly flower, 1 ~ 15 mm long, with oval bracts and raised veins, and the keel flap is elongated into a pointed beak and curled; Wing flap is inverted symmetry; The flag petals are large, and the colors are white, milky yellow, light red and purple. Diploid stamen (9+1), superior ovary, sessile ovary, containing multiple ovules. The style is curly, the top of the style is born, and it is densely hairy.

In general, the natural outcrossing rate of kidney beans is less than 1% by self-pollination, and it takes about 5 days from budding to flowering. Generally, flowers begin to bloom at 2 am, and bloom at 5-1 am, and then few flowers bloom. The flowering sequence is from bottom to top, each flower is open for 1 ~ 2 days, usually pollinated several hours before flowering, and the fertilization rate is about 8% 4 hours after pollination, and the pod setting rate is 2% ~ 4%. In the process of reproduction and regeneration, the population should not be less than 5, but it does not need to be isolated.