Lotus, also known as Nelumbo nucifera, is considered the national flower of India. Here are the reasons why:

Religious Significance
Lotus is considered a sacred flower in Hinduism, Buddhism, and Jainism. It is believed that the lotus symbolizes purity, enlightenment, and self-regeneration. The flower is closely associated with many Hindu gods and goddesses, including Lakshmi, Saraswati, and Brahma.

Cultural Significance
Lotus has been an integral part of Indian art and culture for centuries. The flower has been depicted in paintings, sculptures, and literature. The lotus is also used in traditional medicine, where it is believed to have many health benefits.

Environmental Significance
Lotus grows in muddy waters, and its ability to rise above the water and bloom into a beautiful flower is seen as a symbol of purity and resilience. Lotus is also an important part of the ecosystem, as it provides food and shelter to many aquatic creatures.

Official Recognition
In 1950, the Indian government declared the lotus as the national flower of India. The decision was made after considering the flower's cultural and religious significance, as well as its environmental importance.

In conclusion, Lotus is considered the national flower of India due to its religious, cultural, and environmental significance, as well as its official recognition by the Indian government.