Ashoka (Polyalthia longifolia)

Description

Polyalthia longifolia, the Ashoka native to India, is a lofty evergreen tree, commonly planted due to its effectiveness in alleviating noise pollution. It exhibits symmetrical pyramidal growth with willowy weeping pendulous branches and long narrow lanceolate leaves with undulate margins. The tree is known to grow over 30 ft in height. Polyalthia is derived from a combination of Greek words meaning ‘many cures’ with reference to the medicinal properties of the tree while Longifolia, in Latin, refers to the length of its leaves. Polyalthia longifolia is sometimes incorrectly identified as the ashoka tree (Saraca indica) because of the close resemblance of both trees. One might mistake it as a tree with effectively no branches, but in fact a Polyalthia allowed to grow naturally (without trimming the branches out for decorative reasons) grows into a normal large tree with plenty of shade. The leaves are used for ornamental decoration during festivals. The tree is a main attraction in gardens throughout India. The tree can be cut into various shapes and maintained in required sizes. In past, the flexible, straight and light-weight trunks were used in the making of masts for sailing ships. That is why the tree is also known as the Mast Tree. Today, the tree is mostly used for manufacturing small articles such as pencils, boxes, matchsticks, etc. The oil of the seed has been confirmed to possess anti-oxidant, anti-lipooxygenase and antimicrobial (against various clinical isolates) activities among others. Methanolic extracts of Polyalthia longifolia have yielded 20 known and two new organic compounds, some of which show cytotoxic properties. The fatty acid composition of the seed has also been reported Common names include false ashoka, the Buddha tree, Indian mast tree, and Indian fir tree. Its names in other languages include Ashoka in Sanskrit, Unboi or Debadaru in Assamese, Debdaru in Bengali and Hindi, Asopalav (Gujarati), Glodogan tiang (Indonesian), Ashok in Marathi and Nettilinkam in Tamil, and araNamaram: (Malayalam). The False ashoka was cultivated and gained popularity in British India for nostalgic reasons because it resembled the Mediterranean cypress, and also in order to be used to make ship masts. It does not require pruning in order to maintain its tall, straight, main trunk with short, drooping branches. Found natively in India and Sri Lanka. It is introduced in gardens in many tropical countries around the world. It is, for example, widely used in parts of Jakarta in Indonesia and the Caribbean islands of Trinidad and Tobago. Fresh leaves are a coppery brown color and are soft and delicate to touch, as the leaves grow older the color becomes a light green and finally a dark green. The leaves are shaped like a lance and have wavy edges. The leaves are larval food plant of the tailed jay and the kite swallowtail butterflies. In spring the tree is covered with delicate star-like pale green flowers. The flowers last for a short period, usually two to three weeks, are not conspicuous due to their color. Fruit is borne in clusters of 10-20, initially green but turning purple or black when ripe. These are loved by birds such as the Asian koel Eudynamys scolopaceus and bats including flying foxes.