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We consider WIYN/Hydra spectra of 329 photometric candidate members of the420-Myr-old open cluster M48, and report Lithium detections or upper limits for234 members and likely members. The 171 single members define a number ofnotable Li-mass trends, some delineated even more clearly than inHyades/Praesepe: The giants are consistent with subgiant Li dilution and priorMS Li depletion due to rotational mixing. A dwarfs (8600-7700K) have upperlimits higher than the presumed initial cluster Li abundance. Two of five lateA dwarfs (7700- 7200K) are Li-rich, possibly due to diffusion, planetesimalaccretion, and/or engulfment of hydrogen-poor planets. Early F dwarfs alreadyshow evidence of Li depletion seen in older clusters. The Li-$T_{\rm eff}$trends of the Li Dip (6675-6200K), Li Plateau (6200-6000K), and G and K dwarfs(6000-4000K) are very clearly delineated and are intermediate to those of the120-Myr-old Pleiades and 650-Myr-old Hyades/Praesepe, which suggests a sequenceof Li depletion with age. The cool side of the Li Dip is especiallywell-defined with little scatter. The Li-$T_{\rm eff}$ trend is very tight inthe Li Plateau and early G dwarfs, but scatter increases gradually for coolerdwarfs. These patterns support and constrain models of the universally dominantLi depletion mechanism for FGK dwarfs, namely rotational mixing due to angularmomentum loss; we discuss how diffusion and gravity-wave driven mixing may alsoplay roles. For late-G/K dwarfs, faster rotators show higher Li than slowerrotators, and we discuss possible connections between angular momentum loss andLi depletion.

WIYN Open Cluster Study 89. M48 (NGC 2548) 2: Lithium Abundances in the 420 Myr Open Cluster M48 From Giants Through K Dwarfs