The present work of “Evaluation of Adaptability and Description Morphology of 15 Lines of Com (Zea mays) Yellow Tropical in the First floor May", it was developed in lands of the Company Tobaccos of the Peru S. A. {TAPESA), located in the Km 10,5 of the highway marginal south, District of Juan Guerra. The experiment was carried out completely under the design of blocks Randomized, with 15 treatments (11 coming from INIA and 4 of the CIMMYT of Mexico) and 4 repetitions for treatment. Inside the results obtained in the experiment we can indicate that the Line PIMLE 77 coming from the INIA and the CML 287 that it comes from the CIMMYT of Mexico, presented bigger plant height, ear number and a potential of grain yield with 6 301,00 and 6,023,00 Kg /ha. As far the female flowering the precocious one turned out to be the Line PIMLE 56 with 5055 days and the late one was the Line PIMLE 118 wi...