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Exploring the Native Range of Kentucky Coffeetree

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Exploring the Native Range of Kentucky Coffeetree Exploring the Native Range of Kentucky Coffeetree Andy Schmitz and Jeffrey Carstens orning temperatures clung above waterway, which has cut a deep ravine through freezing when we pulled our mini- the dry grasslands. Most of the tree species fol- Mvan onto the dirt roads of Elm Creek lowed this creek, and sure enough, tucked near Ranch, southeast of Shamrock, Texas. It was stands of mesquite (Prosopis glandulosa) and March 2015, and we were searching for seed of western soapberry (Sapindus saponaria var. Kentucky coffeetree (Gymnocladus dioicus). drummondii), several coffeetrees were growing. Although we never would have expected to find The coffeetrees stood small and stunted—the the species growing in the Texas Panhandle, largest barely exceeding thirty feet—and the beyond the range shown on distribution maps, pickings were slim, with only a handful of the a 2007 herbarium voucher confirmed it was thick leguminous pods dangling in each tree. “locally common” on the property. The ranch We quickly went to work shaking the pods free manager, J. C. Brooks, led us to the namesake and recording measurements and habitat data. ALL IMAGES BY THE AUTHORS UNLESS OTHERWISE NOTED ALL IMAGES BY THE AUTHORS UNLESS OTHERWISE A native population of coffeetrees (Gymnocladus dioicus) at Elm Creek Ranch, Collingsworth County, Texas, was found beyond the conventionally recognized range for the species. William Carr, J. C. Brooks, and Bob Fulginiti collected the herbarium specimen (TEX 00433298) that first pinpointed this location in 2007. Gymnocladus dioicus 3 herbarium vouchers. At a gas sta- tion one afternoon, a man noticed our unusual dash collection and interjected with understandable and friendly curiosity, “Mind if I ask, what’s with the branches in your window?” Coffeetree Collaboration Our 2015 collecting expedition marked the sixth year of a part- nership between the Brenton Arboretum, located in Dallas Center, Iowa, and the National Plant Germplasm System (NPGS) genebank in Ames, Iowa. The partnership has aimed to develop a comprehensive collection of Kentucky coffeetree—sampling populations from across the range of the species, which extends from Ontario through central Arkansas, from west-central Ohio through Oklahoma, along with parts of Kentucky and Tennessee. Although the trees in Texas were scraggly and small, many of the specimens we have seen through- out the years have been impres- sively grand, measuring well over one hundred feet tall. We think Gymnocladus dioicus should be planted more widely in urban environments. The species Kentucky coffeetree (Gymnocladus dioicus) stands among the largest North has no serious insect or disease American members of the bean family (Fabaceae). Andy Schmitz has collected problems; it is drought tolerant an original copy of this hand-colored engraving by Pierre-Joseph Redouté, along and adaptable to tough soil condi- with other Gymnocladus prints. The engraving first appeared in Henri-Louis tions; moreover, it is exceedingly Duhamel du Monceau’s sixth volume of Traité des Arbres et Arbustes que L’on Cultive en France, published in 1815. attractive, with distinctive bark (even at a young age), interesting Three hours later, the temperature had rocketed compound leaves, and yellow fall color. The to 74°F (23°C), and we drove away almost giddy species should be included among the diverse about collecting Kentucky coffeetree in Texas. tree genera that are used to replace ashes (Frax- By this collection on the fifth day of a nine- inus), removed because of emerald ash borer day expedition, our van was filling with bags of (Agrilus planipennis), and oaks (Quercus), suf- the beautiful yet odoriferous pods—collected fering from oak wilt (Bretiziella fagacearum). from sites in Oklahoma and Kansas, in addition Yet if Gymnocladus is planted more broadly, to Texas. The dash had become covered with we realize that a collection of diverse germ- stout sticks, which would eventually become plasm will be needed—both now and far in the 4 Arnoldia 76/1 • August 2018 MICHAEL DOSMANN Andy Schmitz stands beneath an exceptional coffeetree in Aurora, New York, which proved to be the largest specimen observed by Carstens and Schmitz over ten years of collections. This cultivated tree measured 110 feet (33.5 meters) tall, 60 feet (18.3 meters) wide, and 57.3 inches (1.4 meters) in trunk diameter at breast height, earning a big tree score of 305 and recognition as a New York state champion. Gymnocladus dioicus 5 future—to make selections adapted to regional the original herbarium specimens—is also climatic conditions and to preserve germplasm beneficial, whenever possible. for potential reintroduction into the wild. Local contacts occasionally provide us with The Brenton Arboretum’s first collecting trip GPS coordinates for fruiting specimens, but occurred in 2008, but plans for the project origi- our efforts typically depend on a pair of high- nated in 2004, as the institution contemplated quality binoculars. The characteristic brown developing a Nationally Accredited Plant Col- pods are easily recognized from considerable lection through the American Public Gardens distances (even when observed at sixty-five Association’s Plant Collections Network (PCN) miles an hour) and resemble a flock of black- program. Botanical research had been part of birds perched high in the canopy. Thankfully, the Brenton’s mission since it was established the fruits are persistent from October through in 1997. After meeting with Mark Widrlech- May, allowing us to collect in the winter, ner, horticulturist at NPGS and the PCN’s Iowa when they are highly visible in the leafless recruiter, Kentucky coffeetree was determined canopy. (What other species provides a more to be an excellent focus. Gymnocladus dioicus than six-month window of fruit senescence?) was not currently a PCN collection, and the Collections in early to mid-winter were dif- NPGS had only six viable seed accessions of ficult, however, because the stringy and tough the species from known wild origins. Moreover, peduncle does not release the fruits as easily, everyone agreed Gymnocladus was definitely whereas roughly six weeks before bud break, underused in urban landscapes. the fruit is easily shaken from the tree. Prior to 2004, the Brenton had eleven acces- After we have spotted the trees, teamwork sions of Kentucky coffeetree, but none were makes the seed and data collection easier. Our wild collected. Andy Schmitz, the director collection on March 4, 2013, illustrates our of horticulture, made the Brenton’s first wild basic procedure. On the third day of a nine- collection of Gymnocladus in 2008 at Ledges day expedition through southern Indiana and State Park in Boone County, Iowa. He made Kentucky, we were truly looking forward to a few additional collections the following year, exploring Griffith Woods, south of Cynthi- but he knew that as the only horticulturist at ana, Kentucky, which is known for harboring an arboretum operating under a small bud- the world’s largest chinkapin oak (Quercus get, additional help was needed to make their muehlenbergii) within an exceptional old- future PCN collection a reality. This solidified growth savannah. As soon as we pulled into a long-term relationship between two Iowa the parking lot, we could see fruiting coffeetrees horticulturists: Andy Schmitz and Jeffrey on the distant horizon. Although we harvested Carstens at NPGS. from seven trees, the find of the entire trip was the sixth—discovered some four hours later. Collecting Seed and Data This was the second-largest coffeetree we had One of the many benefits of having two insti- ever seen, measuring 120 feet (36.6 meters) tall, tutions striving towards a common goal of pre- 46.5 feet (14.2 meters) wide, and 42.0 inches serving genetic plant diversity is the shared (1.1 meters) in trunk diameter at breast height, work load, especially during the preparation and it currently reigns as the Kentucky state for a collection trip. The success of each trip is champion. To harvest seeds from such a large largely dependent on the initial identification tree, we used a Big Shot® line launcher to of specific collecting locations. For the 2015 accurately propel a weighted bag and line over expedition, for instance, herbarium records branches high in the canopy. We then used and floristic surveys were referenced to iden- the line to shake pods free. The launcher—a tify the anomalous population in Texas, as well slingshot mounted on an eight-foot pole—has as other populations near roadsides and deep proved its worthiness over and over. On early canyons, creeks and national battlefields. Fur- trips, before using the launcher, we averaged ther communication with property owners and up to two hundred seeds per tree, but now we local botanists—including those who collected average six hundred to eight hundred. 6 Arnoldia 76/1 • August 2018 BOB CUNNINGHAM Jeffrey Carstens uses a pole-mounted slingshot to collect pods along the North Folk River in Douglas County, Missouri. At right, coffeetree pods at the Brenton Arboretum. The collection time at each mother tree takes the fruits and seeds for each tree, so that precise around forty-five minutes. Jeff is the “shaker” dimensions are documented.) Our goal is to cap- while Andy is the “gatherer.” Ideally, enough ture the potential genetic diversity at every site. pods are shaken to the ground to fill one or two Sometimes we collect seed from six to eight five-gallon buckets. While the pods are gath- mother trees, but this has ranged from two to ered and packed into labeled sacks, we record ten. Sometimes the trees are found less than a GPS coordinates, elevation, associate species, few hundred yards apart in a forested area, and habitat notes, and descriptions of plant health other times as much as five miles apart along a and abundance. Over the years, we expanded river corridor.
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