Mexican Buckeye provides color in the fall

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Assuming you have the right place for it, the Mexican Buckeye (Ungnadia speciosa) is a great landscape tree. It provides excellent color in the fall with its leaves turning a bright yellow, making a wonderful contrast when placed next to a Big Tooth Maple or a Red Oak.

Mexican Buckeye in Fall
All photos by Delmar Cain

Mexican Buckeye is a native of the Edwards Plateau and its range extends west to the trans-Pecos and southern New Mexico and south into Northern Mexico.

Although it is usually found as an understory tree along the creeks or on canyon walls in central Texas, its range indicates that it may be just the kind of plant that will continue to thrive, even if our climate warms and becomes dryer.

Also known as buckeye and false buckeye, Mexican buckeye is not a true buckeye as the latter common name indicates. It is a spring-flowering small tree or tall shrub in the soapberry family.

A comparison of similarity of the leaves of the Western Soapberry tree with the leaves of the Mexican Buckeye reveals as much. But its three-lobed seedpod, containing three large dark brown to reddish seeds, is similar to the large seedpods of some trees or shrubs in the buckeye family. That might be the reason for its common name.

The true value of the Mexican Buckeye is its drought tolerance and its ornamental appearance. Its fragrant pink to light purple blooms appear early in the spring and can rival, on a healthy tree, the blooms of the redbud tree, another early bloomer. I am not the only one to note the similarity, because both the Mexican Buckeye and the Redbud are host plants for the Henry’s Elfin butterfly. Other bees and butterflies find it attractive as well.

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**ARCHIVED POST AUTHOR: delmar

About the Region

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This low-elevations region of Texas extends inland from the barrier islands, about 60 or so miles, and stretches from Brownsville to Louisiana. In total, it covers about 9.5 million acres, with a high point of 150 feet in elevation. More than 1000 species of plants can be found in this region. On the southern end, species more common in Mexico (such as Sabal mexicana) and Central America occur.

The barrier islands provide us with dune systems, and clay flats to the inland side, which have species found in these areas alone. Many plants here, such as Ipomoea pes-caprae (beach morning glory), can be found throughout tropical regions of the globe. I’ve encountered the same species on the beaches of Guam.

Once inland, vast marshes and wet prairies occur. Occasionally, oak (Quercus fusiformis) groves can be found. Common grasses include species of Bothriochloa, Paspalum, and Sporobolus; eastern gamagrass (Tripsacum dactyloides); and switchgrass (Panicum species). Many rivers and creeks cut through the Gulf Prairies, and along these riparian areas various species of trees, Sabal minor, and other plants adapted to clay soils can be found. Due to overgrazing, farming, and fire suppression, woody species such as mesquite (Prosopis glandulosa) and huisache (Acacia farnesiana), and invasive species such as chinaberry (Melia azedarach), Brazilian pepper (Schinus terebinthifolius), and Chinese tallow (Sapium sebiferum) have increased and displaced our native flora.

Source: Wildflowers of Texas by Michael Eason