Senna phyllodenia, or silvery cassia, is a native of Australia that has thrived in the Arid Greenhouse for many years. The silvery leaves are a great backdrop for the deep-golden flowers held at the tips of the branches. The twisted seedpods forcibly expel the seeds when they reach maturity. Despite membership in the pea family (Fabaceae), the seeds are not edible—in fact, the seeds of some members of this family contain an alkaloid that creates Alzheimer's-like symptoms when consumed.