Naturalist Ellen Holste leads a walk to explore the key characteristics of these plant species, the last to flower in the blooming season. 2–3:30 p.m., Eddy Discovery Center, 17030 Bush, Chelsea. $2 (families, $5); preregistration required at [email protected] (include name, phone number, and number of attendees). $15 Michigan recreation passport ($20 at the gate) required.