The opportunity to investigate a mutant of this phenotype finally occurred 34 years later when we surveyed M2 families from EMS treatment of seeds of cv. Castlemart. A family from a single M1 plant (3-803) yielded two plants of exactly the same phenotype as that of 2-213. In a later planting from the same source, two additional mutants were observed, the combined numbers being 20 + : 4 mutant. Two small M3 families were grown in the current winter greenhouse plantings with tallies of 6 + : 4 mutant and 9 +: 2 mutant, the totals being 15 + : 4 mutant. The close approximation of these two families to Mendelian F2 expectation and, owing to the chimeral nature of M1 plants from such treatments, the tendency toward deficiency of recessives in M2 is typical for segregations from mutagen-treated seeds. Segregation was sharp throughout with no intermediate phenotypes. Since the experience with these small families is concordant with expectation, monogenic recessive inheritance is concluded and the symbol abi (abortive inflorescence) applied to 3-803. This note is contributed particularly because developmental geneticists have expressed interest in mutations affecting floral structures. Limited seeds are available; more are expected in TGRC stocks by the end of the year.