Michigan's Department of Natural Resources has a brochure listing selected wildflower sites in 29 counties throughout the state. (download Michigan Wildflower Viewing pdf) Many sites are near Kalamazoo. The brochure identifies the habitat and best season for each area.
"Michigan’s wetlands and woodlands present the first displays of wildflowers each year. Blooming begins the first warm days of April and May. Early spring wildflowers include skunk cabbage, marsh marigold, spring beauty, wild garlic, jack-in-the-pulpit, bloodroot, hepatica, and Dutchman’s breeches."
Wildflower Viewing Sites: Southwestern Lower Peninsula
1. Kalamazoo Nature Center
2. Allegan State Game Area
3. Saugatuck Dunes State Park
4. Yankee Springs State Rec. Area and Barry State Game Area
5. Warren Dunes State Park
6. Warren Woods State Park
7. Fernwood Botanical Gardens
8. Love Creek Nature Center
9. Niles MDOT Information Center
10. Sarett Nature Center
11. Crane Pond State Game Area (map pdf)
Western Lower Peninsula
1. Aman Park, M-45, 6 mi. west of Grand Rapids
2. Howard Christensen Nature Center
3. Hoffmaster State Park
4.Loda Lake Wildflower Sanctuary Manistee
(Nat. Forest, White Cloud Ranger Dist)
5. Hart-Montague Bicycle Trail State Park
*Note: the brochure lists phone numbers for many of these sites but the listing doesn't reflect the change in area codes from 616 to 269
See also:
The DNR's Wildflower Viewing page
My suggestions for Kalamazoo Wildflowers
A big collection of photos of Michigan Wildflowers