Remember these important natural products:
\[
\boxed{\text{Morphine}\rightarrow\textit{Papaver somniferum}}
\]
\[
\boxed{\text{Reserpine}\rightarrow\textit{Rauwolfia serpentina}}
\]
\[
\boxed{\text{Quinine}\rightarrow\textit{Cinchona}}
\]
These plant secondary metabolites have immense pharmaceutical importance.