With a view to broadening the genetic base of Hevea brasiliensis Muell. Arg. the International Rubber Research and Development Board launched an expedition in 1981 to the Amazon rain forests of Brazil, the centre of origin of Hevea. Nucleus materials of hundred genotypes belonging to the clones established from the seeds collected from two provenances during the expedition, were introduced to India. These were vegetatively multiplied and established in the nursery. Scion height and basal diameter were recorded nine months after nursery planting. Total number of leaves and number of flushes were also recorded. Juvenile yield was recorded by the pricking method 14 months after planting. The genotypes exhibited variability with regard to the characters observed. Morphological variability was also observed. The significance of introduction of new germplasm for improvement of this crop is discussed.