Late summer and early fall prairies are filled with members of the aster family (Asteraceae), one of the most diverse—and sometimes challenging—plant groups to identify. Build your confidence recognizing asters and their relatives by learning the key features and vocabulary used to distinguish species in this important family.
This hands-on workshop takes an intensive field-based approach to identifying asters in prairie habitats. We’ll examine floral structures, discuss ecological roles, and practice identification strategies to differentiate similar species.
This is an intermediate- to advanced-level program; foundational plant identification knowledge and skills are required.
This program meets in person at the Arboretum.
Instructor: Nathanael Pilla, botanist and ecologist, Midwest Biological Survey
Continuing education: This class fulfills a requirement for the Natural Areas Conservation Training (N-ACT) Program.
Age: 16 and older
Course number: W310
Instructor
Nathanael Pilla, botanist and ecologist, Midwest Biological Survey
Nathanael Pilla is a charismatic botanist who is experienced in botanical research and identification, has trained and led wetland restoration crews, interns, and volunteers, and is broadly engaged in environmental outreach and stewardship. Previously with Orbis Environmental Consulting, he currently leads his own environmental consulting company, Midwest Biological Survey. Pilla also serves on the Chicago Wilderness Steering Committee and is an adjunct professor at the University of Notre Dame. He recently co-authored the book Wildflowers of the Indiana Dunes National Park, published through Indiana University Press. When he is not botanizing, he spends his time writing and singing ridiculous songs.
What to Know
This is an intermediate- to advanced-level program; foundational plant identification knowledge and skills are required.
This program meets indoors and outdoors. Check the forecast and dress for the weather.
Wear comfortable, sturdy shoes and plan to walk more than a mile on uneven terrain. Wear long sleeves and pants, sun protection, close-toed shoes with good traction, and rain gear if needed.
Bring a sack lunch, snack, and water.
Sunscreen and insect repellent may come in handy.
See Education Program Policies for information about cancellations, refunds, and scholarships.
Continuing Education
This class fulfills a requirement for the Natural Areas Conservation Training (N-ACT) Program.
Program Schedule
Friday, August 21, 2026, 9:00 a.m. to 4:00 p.m.
Thornhill Education Center (parking lot P-21), West Side
