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This species is accepted, and its native range is Tropical Asia. It is used as animal food and a medicine, has environmental uses and social uses and for food.

Delonix regia is a distinctive tree with large, bright red flowers. The genus name is derived from the Greek words delos (meaning conspicuous), and onyx, meaning claw, referring to the appearance of the spectacular flowers. The tree is commonly cultivated in the tropics and subtropics, including Madagascar, for its ornamental value, but is under increasing threat in its natural habitat due to habitat destruction.

Digitalis purpurea was named by the Swedish botanist Carl Linnaeus in his pivotal publication Species Plantarum in 1753. The generic name Digitalis comes from the Latin for finger (digitus), referring to the shape of the flowers. The specific epithet purpurea refers to the colour of the flowers, which are frequently purple (although a white-flowered form is fairly common). Common foxglove is a popular ornamental, and many hybrids and cultivars are available.