ISBN: - 978-93-88936-09-5 1.7. SOURCES OF RUBBER Rubber is the latex obtained from several climbers and trees of flowering plants belonging to families Moraceae, Euphorbiaceae and Apocynaceae. Table 1.2 Sources of Rubber Common name Para rubber Ceara rubber Panama rubber Assam rubber Indian rubber Landolphia rubber Palay rubber Guayale rubber Dandelion rubber Botanical name Hevea brasiliensis Manihot heptaphylla Castilla elastic Ficul elastic Fiscus Krishna Landolphia kirki Source: Rubber Asia Jan.1999. 1.7 (A) Para rubber (Castilla rubber) This is obtaining from Castilla elastic of the family Moraceae. The plant is a native of Mexico and Central America. Trees which are 8-10 years old yield of good quality latex. 1.7 (B) Ceara rubber Also called Manitoba rubber, this is obtained from species of Manihot. These are grown in many tropical countries including India. 1.7 (C) Assam rubber The rubber tree is a native of Indo-Malayan region. The tree is found in northern India from outer Himalayas to Nepal and Assam, Khasi hills etc. A most and warm climate found in the forests of Assam is most suitable for the growth of these plants. 1.7 (D) Para rubber This tree is growing in plantations of South India. Rubber obtain from this plant is not good as para rubber. Stems, to a large extent and roots to a lesser extent are tapped to obtain the latex. Latex is collected usually from trees which are 20 years or more old. The rubber is not as elastic as para rubber due to a high resin content. 1.7 (E) Guayule rubbers Parthenium argentatum of the family Asteraceae is the source of this rubber. The plant is found in United States of America. 1.7 (F) Landolphia rubber Rubber is obtained from landolphia kirkii, belonging to the family Apocyanaceae. 1.7 (G) Palay rubber 20 Moraceae Moraceae Moraceae Apocyanaceae Cryptostegia grandiflora Apocyanaceae Parthenium argentatum Asteraceae Taraxacum koksaghza Asteraceae Family Euphorbiaceac Euphorbiaceac
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