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Seasonal change in flowers around commercial bee shelters - Fig. 3.

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Slide 13 of 21

Finally, here is the number of bracts per raceme, which showed an almost linear decline over time. The number of bracts is a measure of total flower production on the raceme. Open flowers per raceme declines much more rapidly than bracts per raceme. Thus, the decline in open flowers was caused partly by a reduction in available flowers., and partly by the shortened longevity of flowers after they are pollinated.

Strickler, K. and S. Freitas. 1999. Interactions between floral resources and bees in commercial alfalfa seed fields. Environ. Entomol. 28(2): 178-187.  Fig. 1B