Sterculia urens
| Sterculia urens | |
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| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Eudicots |
| (unranked): | Rosids |
| Order: | Malvales |
| Family: | Malvaceae |
| Genus: | Sterculia |
| Species: | S. urens |
| Binomial name | |
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Sterculia urens Roxb. |
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| Synonyms | |
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Sterculia urens is a species of plant in the family Malvaceae. It is native to India and has been introduced into Burma. A small to medium-sized tree with a pale-coloured trunk, it is commonly known as the भुत्या in Marathi (meaning ghost tree), kulu, Indian tragacanth, gum karaya, katira, sterculia gum or kateera gum. The specific name urens refers to the stinging hairs present on the flowers.
The gum karaya is a medium-sized deciduous tree with horizontally-spreading branches, growing to a maximum height of about 15 m (49 ft). The bark is smooth, fibrous and thick, greenish-grey, with the surface layer peeling off in large flakes. The twigs are hairy at first. The leaves are alternate, simple, hairy beneath and have three to five palmate lobes. They are clustered at the tips of the twigs.
Flowers
The flowers are yellowish-green and produced in panicles in the axils of the leaves. They are polygamous (having male, female and bisexual flowers on the same tree) and are clad in sticky or glandular short hairs. The calyx has five lobes and there are no petals. Male flowers have a columnar boss of ten stamens while bisexual flowers have a ring of anthers round the five free, radiating carpels which grow to 7.5 cm (3 in) when fully developed. They are pinkish and densely covered with red hairs, including stinging hairs. Apis indica is a known pollinator while wind doesn't play any role in pollination.
Fruits
They split open when ripe to reveal up to six squarish, brown or black seeds.
The gum karaya is native to the Indian Subcontinent and Malesia. It is a common species and grows in deciduous forests, both wet and dry. It is often found on steep, rock-strewn slopes at altitudes between 400 and 800 metres (1,300 and 2,600 ft).
A natural gum known as gum karaya is exuded by the tree when the bark is damaged. This valuable substance is traditionally tapped by cutting or peeling back the bark, or by making deep gashes at the base of the trunk with an axe. Such crude methods of extraction often kill the tree, but it has been found that application of the plant growth regulator ethephon stimulates the production of gum, and when used in carefully controlled amounts, increases gum yield and enhances healing of the wounds.
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Wikipedia