Why do so many plants contain methylxanthines (like caffeine)?

Jessica jessicar at delphi.com
Sun Jul 31 21:15:38 EST 1994

Through my interest in nutrition, I have discovered that many plants contain
substances that are adrenergic in humans, like coffee, yerba mate, and
ephedra.  However, I haven't been able to figure out what these substances
do for the plants themselves.  Does it make the plants "adrenal" system as
excited as it makes ours?
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