The ornithophilous flowers have the following characteristic features:
1. The flowers are usually large in size.
2. The flowers are tubular, cup shaped or um- shaped.
3. The flowers are brightly coloured, red, scarlet, pink, orange, blue and yellow which attracts the birds.
4. The flowers are scentless and produce nectar in large quantities. Pollen and nectar form the floral rewards for the birds visiting the flowers.
5. The floral parts are tough and leathery to withstand the powerful impact of the visitors.
