Every other spring, Dr. Les teaches EEB 3271 Systematic Botany, covering the vast diversity of vascular plants. With 3,000 species, the EEB Biodiversity Education & Research Greenhouses enable students to explore global plant diversity and examine diagnostic traits of lineages on living samples from throughout the world. The course relies also on the extensive holdings of preserved plants in the George Safford Torrey Herbarium (CONN). Together these resources provide unique experiential learning opportunities to all students interested in biodiversity and plant evolution.