The modeling of plants has a relatively long history, but the modeling of the
fundamental relationships between molecular-level regulatory mechanisms, short-
and long-distance signaling, and the resulting plant form introduces new
challenges and requires new methodologies.  Their development is a fascinating
area of current interdisciplinary research.

In my presentation, I will discuss mathematical models and computer simulations
of plants, with a focus on the model plant Arabidopsis thaliana.  The objective
of these models is the understanding of developmental mechanisms that take
place at different levels of plant organization, and the temporal and spatial
integration of these mechanisms.  Examples include short- and long-distance
signaling, spiral phyllotaxis, the fate of buds, and the development of plant
architecture.  Interactive visual simulations of these processes have been
implemented using the formalism of L-systems.