For many of us, part of the joy of spring is heading out to the forest preserves and seeing the wildflowers in bloom. But for Susanne Masi, a plant conservationist at the Chicago Botanic Garden, the wildflowers she seeks we might never see, since they are listed as threatened or endangered by the state or federal government. All are rare, either due to loss of habitat, removal of fire from the ecosystem, or competition from invasive plants such as European buckthorn or purple loosestrife.

Plants of Concern

Susanne Masi has been gathering data on these species for the past year. This information will help to maintain their numbers and ensure their survival in the wild. She is assisted by more than 100 volunteers in a monitoring program called Plants of Concern, a joint program coordinated by the Chicago Botanic Garden and funded in part by Chicago Wilderness.

Orchids of Illinois

Of all the wildflowers monitored, some of the showiest are in the orchid family. "You think of orchids as tropical, not plants found in the Midwest," she said, "and yet we have 17 genera here in the Chicago area alone. The difference is that orchids are mainly arboreal in the tropics, but here they’re terrestrial. What makes orchids particularly interesting is the variety of their flowers. Each genus is different, with their flower shapes partly determined by the type of insect that pollinates them."

Lady Slipper Orchids

The showy lady slipper (Cypripedium reginae) is a rare orchid in the Chicago area but not yet monitored by Plants of Concern. Its large white-and-crimson-striped, pouchlike flower admits only tiny green bees, which are their pollinators. Other insects fail to get into the flower or become stuck between the sticky anthers. Sometimes called the "Queen Orchid of America" with its slipperlike pouch of vivid purple-pink and its three white, flared petals, it rivals the orchids of the tropics for beauty. It grows from 1 to 3 feet, in fens or bogs. Two other lady slippers, also rare in the Chicago area and pollinated by the tiny green bee, are the moccasin flower (Cypripedium acaule) and the small yellow lady slipper (Cypripedium calceolus var. parviflorum). The moccasin flower has a small, waxy, white pouchlike flower with green-purple sepals and petals extending outward and over. It grows up to 12 inches in wet prairies and boggy meadows. The yellow lady slipper, monitored by Plants of Concern, grows up to 2 feet with a showy yellow inflated lip nearly 2 inches long, and two spirally twisted side petals ranging in color from green to orange to brown. Looking to some like a "bright yellow Indian moccasin," it likes calcareous marshy habitats.