This section is from the book "British Wild Flowers - In Their Natural Haunts Vol2-4", by A. R. Horwood. Also available from Amazon: A British Wild Flowers In Their Natural Haunts.
Though we cannot definitely say the colours of flowers are brilliant and brightly coloured merely to attract insects to perform, in return for honey or pollen, the much-needed office of cross-pollination, yet the two are obviously connected. It is a fact worthy of notice that the fields are especially the happy hunting-grounds of all manner of insects. Beetles, flies, butterflies and moths, bees and wasps, dragonflies, and all the other less-known orders are fully represented in the life of the meadows. And with the hum of the bees, the drone of the wasp, the buzzing of flies, one notices that the fields are covered continuously with masses of bloom from March to September. Early one sees the lilac Lady's Smock, and later on, the primrose-tinted Cowslip, the golden Dandelions, the golden Buttercups, the crimson Clover, the lovely blue Meadow Crane's Bill. These grow so densely that the fields are one mass of colour. Compare this with a woodland or a lake or a salt marsh, and one is at once struck with the beauty and diversity of the flowers of the fields.