The Living Colour of Tropical Forests

Tropical South Asia bursts into colour year-round, largely thanks to its remarkable diversity of flowering trees. These trees are far more than ornamental — they anchor ecosystems, feed insects and birds, and have been woven into cultural and medicinal traditions for centuries. Here are seven of the most striking species you're likely to encounter.

1. Flame of the Forest (Butea monosperma)

Also known as Palash, this tree transforms dry deciduous forests into a sea of orange-red flame between February and April, often before any leaves appear. Sacred in Hindu tradition, it is the state flower of Jharkhand. Its flowers provide nectar for sunbirds, parakeets, and the Indian giant squirrel.

2. Indian Laburnum (Cassia fistula)

Known as Amaltas, the Indian Laburnum drapes itself in long hanging clusters of bright yellow flowers in the heat of April and May. It's one of the most widely planted roadside trees in the subcontinent and the national flower of Thailand. The seed pods are used in traditional medicine.

3. Coral Tree (Erythrina variegata)

The Coral Tree produces vivid scarlet flowers that appear on bare branches, making it easy to spot at a distance. It is a significant nectar source for sunbirds and is commonly planted as a shade tree in tea and coffee plantations across South and Southeast Asia.

4. Silk Cotton Tree (Bombax ceiba)

One of the tallest trees in tropical forests, the Silk Cotton Tree erupts in large red flowers in late winter, drawing woodpeckers, starlings, and fruit bats. Its enormous buttress roots are distinctive, and the silky fibres from its seed pods have been used in traditional crafts for centuries.

5. Kadamba (Neolamarckia cadamba)

The Kadamba is steeped in mythology — it is strongly associated with Lord Krishna in Indian tradition. The round, fragrant, yellow-orange flower heads appear during the monsoon, when the tree is in full green leaf, making for a lush, vivid display. It also grows exceptionally fast, making it useful in reforestation efforts.

6. Queen's Crape Myrtle (Lagerstroemia speciosa)

A tall deciduous tree native to the Indian subcontinent and Southeast Asia, this species produces striking sprays of purple-pink flowers in summer. It is widely planted in avenues and gardens and is the national flower of Malaysia. Its leaves turn deep crimson before falling, adding a second seasonal spectacle.

7. Portia Tree (Thespesia populnea)

Common in coastal and riparian habitats, the Portia Tree has cheerful yellow flowers with a dark purple centre that transition to deep purple-pink as they age. It is highly salt-tolerant and plays an important role in stabilising coastal ecosystems, particularly mangrove fringes.

How to Identify Tropical Trees

Identifying tropical trees takes practice, but a few consistent approaches help:

  • Note the leaf shape, arrangement (opposite or alternate), and texture.
  • Observe bark texture and colour — many tropical trees have highly distinctive bark.
  • Photograph flowers and fruits; these are often the most diagnostic features.
  • Use apps like iNaturalist to confirm identifications using community knowledge.

Learning to name the trees around you deepens every walk in a tropical landscape into something richer and more rewarding.