Left panel: equivalent width of the Li I λ6707.8 Å line plotted as a function of the spectroscopic effective temperature. The lines show the upper boundary for Hyades (dash-dotted; Sestito & Randich 2005) and the lower and upper envelopes of the Pleiades cluster (dashed; Soderblom et al. 1993a). The position of targets in the UMa group is represented by diamonds and triangles (open symbols are upper limits), as found by Ammler-von Eiff & Guenther (2009) and Soderblom et al. (1993b), respectively. Right panel: lithium abundance as a function of T_eff. Plus, diamond, triangle, and cross symbols represent the position of targets in Pleiades, UMa, and Hyades clusters, respectively, by the same authors.