As the late April heat intensifies and the scorching sun begins to wilt and melt all that it beats down upon, it is time for the golden showers. The Indian laburnum or Golden Shower tree is in bloom. Its masses of yellow blossoms cascade from the tree like waterfalls of molten gold. Indian summer is really here!
Indian laburnum or Cassia fistula gets its genus name from the word Kasia which was given by an ancient Greek botanist Pedanius Dioscurides, and its species name fistula meaning pipe, which refers to its tube-like pods.
C. fistula is widely grown as an ornamental plant in tropical and subtropical areas. It is native to Southeast Asia and is found in Sri Lanka, Nepal, Bhutan, South and SW China, Myanmar, Malaysia, Indonesia, Pakistan and other tropical Asian countries, some parts of Australia and tropical Africa.
The Amaltas as it is commonly called in Hindi, is one of the most widespread of Indian trees and occurs throughout the country including the Andamans, and thus it has a vernacular name in all Indian languages. Many of the names refer to the long stick-like pods which appear almost alongside the blooms.
The Indian Laburnum is the common English name of this moderate-sized, deciduous tree. Its bark is greenish-grey and smooth on young trees, but with age it becomes brown and rough. This is not a tree that attracts attention for the large part of the year. It has a nondescript branching pattern and scant foliage. Between February and May the leaves get dull and ragged and many of them fall. New leaves are a beautiful fresh green sometimes tinged with pink, or a rich copper colour, and covered with a soft down; they remain folded and hang loosely downwards until they are fully grown. It is with the onset of the summer that the laburnum bursts into full glory with sprays of golden flowers. It is the profuse mass of colour that attracts immediate attention. But a closer look reveals the delicate distinct beauty of the individual flowers that make up the mass. Each flower has five spoon-shaped petals of unequal size and ten yellow stamens of which three are long and curve gracefully upwards, the next four are shorter and curve the opposite way, while the remaining three are even shorter and straight. All are crowned with large, brown anthers where pollen is produced.
Around the same time, the long hanging cylindrical pods that give the tree some of its common names like Pudding Pipe tree appear in large numbers, making a striking picture of brown with yellow. At first the pods are green and soft, then they turn brown, and eventually become black and very hard. The pods contain large numbers of shiny brown seeds arranged in small compartments surrounded by a sticky brown pulp.
In the scorching sun, the blooming flowers are a magnet for a wide range of insects and birds, which in turn creates dynamic ecological interactions. Bees and butterflies are important pollinating agents. The laburnum is specially connected to the Carpenter bees; the vibrations generated by the bees as they hover near the flowers cause the pollen grains to break out of the stamens, and attach to the bee’s body, and therefrom travel far and wide. Weaver Ants lurk around the flowers to pounce and prey on pollinators that visit the flowers. While flowers are the star attraction, the leaves too play important supporting roles. Greater Short-nosed Fruit Bats consume the leaves of the Golden Shower Tree, which are rich in protein and calcium. Butterflies like Mottled Emigrant, Common Emigrant and Common Grass Yellow, lay eggs on the leaves, which also provide the first food for the caterpillars as they emerge from the eggs. The ripe pods also attract mammals like monkeys, jackals, bears and pigs who break these open to eat the pulp, thereby helping to scatter the seeds that lie within, either directly or through their ingestion and excretion.
For humans, the Indian Laburnum also provides much more than sheer aesthetic pleasure. Its leaves, fruits and flowers are known to have medicinal relevance in Ayurveda and other traditional systems of medicine. In fact, in Sanskrit, the tree is revered as Aragvadha or ‘disease killer’. The fruit pulp is known to have laxative properties, while its flowers are used in certain folk remedies. The leaves have also been used as fodder to supplement the diets of domestic cattle, sheep, and goats, and as green manure. The flowers are also eaten by some tribal communities, and more recently, new age chefs are creating innovative ‘Amaltas’ recipes of teas, chutneys, jams, and salads using the flowers.
As with most indigenous trees, the Amaltas finds a place in culture and tradition. The tree finds mention in literature from the epics like the Ramayana and Mahabharata, to folk literature, and is depicted in paintings and pictures. The Indian Postal Department issued a stamp in its honour, and some cities in India have beautiful avenues of Laburnum trees, original planted by the British.
In Kerala, the Kondrai or Kannikona flower as it is locally known has great cultural and religious significance. According to traditional belief it is very auspicious to have a first sighting of the flowering tree at dawn on Vishu, the New Year’s Day. The Vishukanni (literally the first sight on the day of Vishu) ritual includes an offering of all the ‘golden items of seasonal harvest’ like jackfruit, golden cucumber, mangoes and cashews, on this day. In fact the Kannikona flower is the state flower of Kerala.
Several countries of South East Asia also honour this beautiful tree. The golden hues of the Laburnum flowers signify royalty in Thailand where this has been designated as the national flower, and there is an annual flower festival is named after this tree. In Sri Lanka where it is called Ehela, this tree is planted around Buddhist temples. In Laos the blooming flowers known as Dok Khuan are also associated with their new year when the flowers are offered at temples and also hung in homes in the belief that they will bring happiness and good luck to the house and family.
As I look out from my window at the glorious golden cascade of the Amaltas, I too wish that the auspicious sighting will bring the same to my home.