2. In various strains of the Guarany corn of Paraguay mid‑cob color is frequently associated with a faint purple color on the pistillate glumes or bracts. The gene responsible for this color is an allele of Pl and shows linkage with Y on chromosome 6. In the presence of B the purple glume color becomes very intense and is also extended to the leaves and stalks. This new allele, or another in the series, seems also in certain stocks to be responsible for the basal glume in the tassel.