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Abstract. Enormous quantities of latex are found in over 40 plant families on a worldwide basis. Despite the proportions involved, the role of this substance within plants is still a matter of conjecture. Latex is closely associated with isoprene which may be emitted as a gas from both plants (that may or may not contain latex) and animals. The volume of isoprene expelled into the atmosphere each year is approximately equal to that of total methane emissions. The latter (but not the former), a known "greenhouse gas", is the subject of considerable concern. It appears reasonable, therefore, that efforts be made to examine more thoroughly the formation and function of latex and associated compounds in order to obtain a better understanding of a number of critical biological and environmental phenomena known to be associated with these phytochemicals. Possible roles played by these substances in both plants and their surrounding environment are described.

Experiments with seeds of the guanacaste tree, E. cyclocarpum (Jacq.) Griseb., indicate that scarification of the seed testa may be more beneficial than heat treatments in stimulating rapid germination but that a humid environment and warm tropical temperatures are completely adequate for this process. Based on these data, the possibility that megafauna served and presently serve as

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