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We address the existence and origin of the lithium (Li) desert, a region inthe Li - T_eff plane sparsely populated by stars. Here we analyze some of theexplanations that have been suggested for this region, including mixing in thelate main sequence, a Li dip origin for stars with low Li abundances in theregion, and a possible relation with the presence of planets. To study the Lidesert, we measured the atmospheric parameters and Li abundance of 227 late-Fdwarfs and subgiants, chosen to be in the T_eff range of the desert and withoutprevious Li abundance measurements. Subsequently, we complemented those withliterature data to obtain a homogeneous catalog of 2318 stars, for which wecompute masses and ages. We characterize stars surrounding the region of the Lidesert. We conclude that stars with low Li abundances below the desert are moremassive and more evolved than stars above the desert. Given the unexpectedpresence of low Li abundance stars in this effective temperature range, weconcentrate on finding their origin. We conclude that these stars with low Liabundance do not evolve from stars above the desert: at a given mass, starswith low Li (i.e., below the desert) are more metal-poor. Instead, we suggestthat stars below the Li desert are consistent with having evolved from the Lidip, discarding the need to invoke additional mixing to explain this feature.Thus, stars below the Li desert are not peculiar and are only distinguishedfrom other subgiants evolved from the Li dip in that their combination ofatmospheric parameters locates them in a range of effective temperatures whereotherwise only high Li abundance stars would be found (i.e., stars above thedesert).

Lithium abundance patterns of late-F stars: an in-depth analysis of the lithium desert