Photos by Scott Woodbury.
Resilient Ozark Plants: On the Run and Old as the Hills
Above: Campanula rotundifolia Below: Hamamelis vernalis
M
ore species of plants exist in the Ozark Highlands— one of the oldest mountain ranges on the planet—than anywhere in the lower Midwest. Why? Because the Ozarks are an ancient crossroads for migrating plants. They are a tapestry of plants, uprooted and on the run from everchanging climate and advancing glaciers. During the last two million years, many plants and animals
Filapendula rubra
migrated to the warmer climate of the Ozarks as they were pushed south and west by advancing glaciers. As the climate warmed, and glaciers retreated back north, most cooler-loving species followed. But some species (called glacial relics) stayed behind. They found refuge in the bottoms of cool sinkholes, north-facing slopes, box canyons, and wetland fens. To this day, glacially disconnected animals like wood frogs and four-toed salamanders still hang out in these cool and moist, shady safe-havens, while the majority of their population exists far to the north and east. The same is true of plants like queen-of-the-prairie (Filapendula rubra) and Ridell’s goldenrod (Solidago ridellii), both living in wetland fens, and also harebell (Campanula rotundifolia) and white camas (Zigadenus elegans) that cling to north-facing bluffs along the Jacks Fork River. These are disconnected species (called disjunct) because they exist beyond or at the edge of their natural ranges. According to Dr. Julian Steyermark, author of The Flora of Missouri,
SCOTT WOODBURY Horticulturist 12
April 2021 | kcgmag.com
Penstemon cobaea, Echinacea pallida, Oenothera macrocarpa many other plants have found a second home in the Ozarks, beyond or at the edge of their normal ranges, including tall larkspur (Delphinium exaltatum), barren strawberry (Waldsteinia virginiana), soapweed (Yucca glauca), dwarf crested iris (Iris cristata), common witchazel (Hamamelus virginiana), beautyberry (Callicarpa americana), mountain azalea (Rhododendron prinophyllum), rose turtlehead (Chelone obliqua), yellowwood (Cladrastis kentuckia), limber honeysuckle (Lonicera dioica), Texas greeneyes (Berlandiera texana) and dense blazingstar (Liatris spicata). But what about the plants that originally came from the Ozark crossroads, and never left home (called endemic)? They apparently began to evolve there (and continue to evolve) one hundred million years ago. Not quite as old as the five hundred million years old hills, but pretty old nevertheless. Common garden
plants endemic to the Ozarks include woodland spiderwort (Tradescantia ernestiana), Fremont’s leatherflower (Clematis fremontii), little-flower alumroot (Heuchera puberula), Ozark witchazel (Hamamelis vernalis), Bush’s poppy mallow (Callirhoe bushii), shining bluestar (Amsonia illustris), purple beardtongue (Penstemon cobaea), cliff goldenrod (Solidago drummondii), Missouri black-eyed Susan (Rudbeckia missouriensis) and yellow coneflower (Echinacea paradoxa) to name a few. So if you are taken by the origin stories of native plants, like I am, then pick up a few Ozark native plants the next time you are at a garden center or plant sale near you. They have been around a long, long time, and chances are, they will continue to hang on, deep in the Ozark Highlands, and possibly in your back yard. Happy gardening! Find suppliers of native plants and seeds at www.grownative.org, Resource Guide.
Horticulturist Scott Woodbury is the Curator of the Whitmore Wildflower Garden at Shaw Nature Reserve in Gray Summit, MO, where he has worked with native plant propagation, design, and education for 30 years. He also is an advisor to the Missouri Prairie Foundation’s Grow Native! program.
