Final answer:
The Sigma Alpha sorority flower is not discernible from the provided biological texts, as these descriptions do not specifically correlate to sorority symbolic choices.
Step-by-step explanation:
The Sigma Alpha sorority flower is not directly mentioned in typical biological texts, but one can infer the proper answer using the provided clues. In particular, we see that lilies are described as a superior flower, which means they have the ovary above the other flower parts.
However, this botanical description may not directly correlate to the symbolic choice of a sorority flower. To determine the correct flower associated with Sigma Alpha sorority, one might need to refer to sorority-specific information or their official literature.