Development of Diagnostic Microscopic and Chemical Markers of Some Euphorbia Latexes Analysis of Hydrocarbon and Sterol in Spring Latex of Euphorbia tirucalli by Gas Chromatography/Mass Spectrometry Chemical constituents from Euphorbia tirucalli Chemical constituents from Euphorbia tirucalli Comparison of the Distribution of Laticifers in Diploid and Tetraploid of Euphorbia tirucalli L