A green stem selection received from C. F. Andrus appeared to be identical in phenotype with green stem a. Closer examination however, showed that when growth was slowed through lack of water or because of transplanting, the underside of the cotyledons and leaves become purple. The stem remains green under all conditions. Breeding tests show that this green stem shows typical monogenic inheritance and that the gene is different from the other green stem genes a, al, and aw. Linkage tests reveal either loose linkage or independence from tester genes in Groups I, II, IV, V, VI, VIII, and XI. With clear skin y it gives a cross-over value of 41 +/- 4.9% which is a doubtful likage.