Abstract
Summary Analysing a large number of different grass flowers, a hypothesis is proposed to explain the floral variation found in the family. It is postulated that the interaction of the palea with the floral apex generates an area of inhibition wich substantially affects the floral apex. Depending on the mode of action in the reduction process, together with an independent phenomenon which affects the gynoecial organization, four major evolutionary patterns are recognized. The form of grass flower which has been most successful appears to be the bi-lodiculate, tri-staminate and bi-stigmatic, with the stamens belonging to two different cycles – the frontal from the outer whorl and the two lateral from the inner whorl.
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