In this work, Euphorbia macroclada were pyrolyzed in a laboratory-scale fixed bed reactor. The influence of final pyrolysis temperature, heating rate, and pyrolysis atmosphere on the product Yields was investigated. Pyrolysis runs were performed using reactor temperatures ranging between 400 and 700degreesC with heating rates of 7 and 40degreesC/min. The highest liquid yield was obtained at 550degreesC pyrolysis temperature with a heating rate of 7degreesC/min. The results from the pyrolysis of Euphorbia macroclada showed that the clear increments of the pyrolysis conversion in the temperature interval 500 to 550degreesC are due to the rapid devolatilization of cellulose and hemicelluloses.