  The orders of magnitude variation in lithium abundances of evolved stars have
long been a puzzle. Diluted signals, ambiguous evolutionary states and unknown
masses have made it challenging to both map the expected lithium signals and
explain the anomalously lithium-rich stars. We show here using a set of
asteroseismically characterized evolved stars that the base lithium abundance
in red giant stars is mass dependent, with higher mass stars having higher
`normal' lithium abundances, while highly lithium enhanced stars may cluster
around 0.8 or 1.8 M$_\odot$. We confirm previous studies that have shown that
lithium enhancement and rapid rotation are often coincident, but find that the
actual correlation between lithium abundance and the rotation rate, whether
surface rotation, internal rotation, or radial differential rotation, is weak.
Our data support previous assertions that most lithium rich giants are in the
core-helium burning phase. We also note a tentative correlation between the
highest lithium abundances and unusual carbon to nitrogen ratios, which is
suggestive of binary interactions, though we find no simple correlation between
lithium richness and indicators of binarity.
