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Bracts in the inflorescence of crucifers are ordinarily wanting, but may be seen in some genera, Erucastrum pollichii being perhaps the most widely known instance, although other cases might easily be cited. For our special purpose we may take up only the more simple cases that may be available for experimental work.
Besides the Sisymbrium some six other genera afford similar structures. Erucastrum pollichii has been already alluded to in a former lecture when dealing with the same problem from another point of view. As previously stated, it is one of the most manifest and most easily accessible examples of a latent character becoming active through systematic atavism.
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