Strausbaugh, Perry D. Department of Botany, West Virginia University, Morgantown, West Virginia.
Core, Earl L. Department of Biology, West Virginia University, Morgantown, West Virginia.
Cook, A. A. Department of Plant Pathology, University of Florida, Gainesville, Florida.
- Economic importance
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Hevea brasiliensis, a member of the spurge family (Euphorbiaceae) and a native of the Amazon valley. It is the natural source of commercial rubber. The rubber tree (see illustration) can reach 60–100 ft (18–30 m) in height, with a circumference of 8–10 ft (2.4–3 m). The Janka hardness for H. brasiliensis is 930 lb-force (422 kg-force); its density is 35–40 lb/ft3 (560–640 kg/m3). See also: Euphorbiales; Forest and forestry; Rubber; Tree
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