A PDF field guide to the species reported in and around Sauk Trail Forest Preserve, with common and scientific names and up to 3 photos of each, laid out for use in the field and offline.
Species people report often in and around Sauk Trail Forest Preserve include Orchard Orbweaver, Buckthorn, Myrtle, Horseweed and Haymaids. Plants lead the list with 49 species.
The 20 species reported most often here, of 50 in the full guide.

Buckthorn
Myrtle
Horseweed
Haymaids
Poison Ivy
Ailanthus
Tell me what you're looking for, and I'll do my best to answer.

Wild Onion

Prairie Rose

Browneyed Susan

Rough Sunfower
Heal-All
Wild Geranium

Buttonweed

Lilac
Scarole

Sourgrass

Tell me what you're looking for, and I'll do my best to answer.
Ivy

Plantain