2. Southern margin of the Amazon Basin.
New material from the Upper Amazon reaches, still in Peru, and from the Bolivian lowlands near Reyes (coll. Culer) extend considerably further the area of the Long Ear Soft corn with interlocked rows. Except the occurrence of a popcorn with spherical ears and a brachytic plant with short internodes in the Territory of Acre (Brazil), the Long Ear Soft corn is the only race present in this region.