Very widespread in the plant world, e.g. in Brassicaceae, Apocynaceae, Dilleniaceae, Ranunculaceae, Leguminosae, etc. Found esp. in broccoli, capers, chives, kale, garden cress, fennel, lovage, dill weed and tarragon [CCD] Kaempferol is a natural flavonol, a type of flavonoid. Many glycosides of kaempferol, such as kaempferitrin and astragalin, have been isolated as natural products from plants. Kaempferol consumption in tea and broccoli has been associated with reduced risk of heart disease. [Wikipedia]

Kaempferol is a natural flavonoid which has been isolated from Delphinium, Witch-hazel, grapefruit, and other plant sources. Kaempferol is a yellow crystalline solid with a melting point of 276-278 degree centigrade. It is slightly soluble in water, and well soluble in hot ethanol and diethyl ether.