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Biodiversity loss is a problem in the Mexican rangelands. It is common that this loss involves native forage species. Thus, there is need for using high forage yield native species in re-vegetation programs. It is important to find out how to identify such species through morphological, cytological and biochemical attributes that are linked to at least one trait of interest (e.g. forage yield). The aim of this study was to look at the dependence of tiller diameter and forage yield on tiller density in five native forage species used in re-vegetation programs within the Mexican state of Chihuahua. For that, measurements of tiller density, NS (number of stems) diameter, and TD (cm), as well as forage yield (FY) were performed in 91 plants of Arizona cotton top grass, 101 plants of Green sprangletop grass, 111 plants in Plains bristlegrass, 135 plants of Sideoats grama and 136 plants of Blue grama grass. These plants were collected in the field and then established at ‘La Campana' Experimental Station of the National Institute for Forestry, Agriculture and Livestock (INIFAP). All the bivariate relationships were notably well-adjusted to potential modelsː TD=3.128NS0.356 and R2=0.657, and FY=0.175NS1.237 and R2=0.872 for Arizona cotton top grass; TD=4.636NS0.309 and R2=0.425, and FY=1.181NS1.079 and R2=0.627 for Green sprangletop grass; TD=2.478NS0.351 and R2=0.463, and FY=1.777NS0.715 and R2=0.382 for Plains bristlegrass; TD=2.115NS0.371 and R2=0.663, and FY=0.096NS1.33 and R2=0.749 for Sideoats grama; and TD=3.195NS0.31 and R2=0.443, and FY=0.194NS1.143 and R2=0.733 for Blue grama.