Which characteristic is NOT true about the lower floret in the spikelet of Andropogoneae?

In the study of grass morphology, particularly within the Andropogoneae tribe, it is essential to understand the structure of spikelets, which typically contain multiple florets. The lower floret in these spikelets is noted for its specific characteristics.

The lower floret is often described as reduced, meaning it may not be as developed or prominent as the upper floret. In many species within this tribe, the lower floret is indeed sterile, contributing to the reproductive strategy of the plant. This sterility is advantageous as it allows the upper floret, which is fertile and capable of producing seeds, to receive more resources and support from the plant.

Since the question specifies a characteristic that is NOT true about the lower floret, identifying it as fertile is incorrect. This floret's reduced and often sterile nature serves to enhance the survival and reproductive success of the grass. Thus, the assertion that the lower floret is fertile contradicts the observed characteristics typically associated with it in the Andropogoneae tribe spikelet structure.