10. A new annual form of teosinte, resembling the Durango variety, was crossed by sh-wx maize. Five F1 plants had approxiately normal amounts of crossing-over in the sh-wx region while one plant showed no recombinations in this interval. The F1 ears had 10 rows of seeds as contrasted with the usual 4-rowed ears found for F1 hybrids of the other annual forms of Euchlaena. No segregation into types occurred when selfed and sibbed seed of the pure Euchlaena was grown. No admixture with maize was evident as the tassels had no main spikelet.