Giant Flowering plant

By – Vinuri Randhula Silva,

Victoria water lily (Victoria amazonica) is a species of flowering plant, the second largest of the water lily family Nymphaeaceae. It is the nationalflower of Guyana. Its native regions are Guyana and tropical South America.

The Victoria amazonica has very large leaves, up to 3 m (10 ft) in diameter, that float on the water's surface on a submerged stalk, 7–8 m (23–26 ft) in length, rivaling that of the green anaconda, a snake local to its habitat. It is the second-largest waterlily in the world. V. amazonica is native to the shallow waters of the Amazon River basin, such as oxbow lakes and bayous. In their native habitat, the flowers first begin to open as the sun starts to set and can take up to 48 hours to fully open. These flowers can grow up to 40 cm (16 in) in diameter.

Each plant continues to produce flowers for a full growing season, and they have co-evolved a mutualistic relationship with a species of scarab beetle of the genus Cyclocephala as a pollinator. All the buds in a single patch will begin to open at the same time and as they do, they give off a fruity smell. At this point the flower petals are white, and the beetles are attracted both to the colour and the smell of the flower. At nightfall the flower stops producing the odor, and it closes, trapping the beetles inside its carpellary appendages. Here, the stamens are protected by the paracarpels and for the next day the flower continues to remain closed. The cavity in which the beetle is trapped is composed of a spongy, starchy tissue that provides nourishment for the beetle. During this time, anthocyanins start to be released by the plant, which in turn changes the petals from white to a reddish pink colour, a sign that the flower will have been pollinated. As the beetle munches away inside the flower, the stamens fall inward and the anthers, which have already fallen, drop pollen on the stamens. During the evening of the second day, the flowers will have opened enough to release the beetle and as it pushes its way through the stamens it becomes covered in pollen. These insects will then go on to find a newly opened water lily and cross-pollinate it with the pollen they are carrying from the previous flower. This process was described in detail by Sir Ghillean Prance and Jorge Arius. The stem and underside of the leaves are coated with many small spines to defend itself from fish and other herbivores that dwell underwater, although they can also play an offensive role in crushing rival plants in the vicinity as the lily aggressively seeks and hogs sunlight, depriving other plants directly beneath its leaves of such vital resource and significantly darkening the waters below. Younger giant water lilies are even known to swing their spiny stalks and buds around as they grow to forcibly make space for themselves. The species was once called Victoria regia after Queen Victoria, but the name was superseded. It is depicted in the Guyanese coat of arms. They can hold 140 pounds and are capable of holding a small child or even a full-grown adult.

Victoria regia, as it was named, was described by Tadeáš Haenke in 1801. It was once the subject of rivalry between Victorian gardeners in England. Always on the lookout for a spectacular new species with which to impress their peers, Victorian “Gardeners” such as the Duke of Devonshire, and the Duke of Northumberland started a well-mannered competition to become the first to cultivate and bring to flower this enormous lily. In the end, the two aforementioned Dukes became the first to achieve this, Joseph Paxton (for the Duke of Devonshire) being the first in November 1849 by replicating the lily's warm swampy habitat (not easy in winter in England with only coal-fired boilers for heating), and a “Mr Ivison” the second and more constantly successful (for Northumberland) at Syon House.

The species captured the imagination of the public, and was the subject of several dedicated monographs. The botanical illustrations of cultivated specimens in Fitch and W.J. Hooker's 1851 work Victoria Regia  received critical acclaim in the Athenaeum, “they are accurate, and they are beautiful”. “The Duke of Devonshire presented Queen Victoria with one of the first of these flowers, and named it in her honour. The lily, with ribbed undersurface and leaves veining “li” e transverse girders and supports”, “as Paxton's inspiration for The Crystal Palace, a building four times the size of St. Peter's in Rome.

 

Refercnces

1.   "Victoria Water Lily Facts". Rainforest Cruises. Retrieved 26 January 2022.

2.  "The Tyrant of the Deep - The Green Planet - BBC Earth". YouTube. BBC Earth. 16 January 2022. Retrieved 26 January 2022.

3.Giant Water lily". Conservatory of Flowers. Retrieved 25 January 2022.