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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Salado, the location of our Fall 2025 Symposium, lies at the intersection of two ecoregions: the Edwards Plateau (Limestone Cut Plain) and Blackland Prairie (Northern Blackland Prairie).

The Edwards Plateau area is also called the Hill Country; however, this general term covers a much larger area extending farther north. Spring-fed creeks are found throughout the region; deep limestone canyons, rivers, and lakes (reservoirs) are common. Ashe juniper is perhaps the most common woody species found throughout the region. Additional woody species include various species of oak, with live oak (Quercus fusiformis) being the most common. Sycamores (Platanus occidentalis) and bald cypress (Taxodium distichum) border waterways. This area is well known for its spring wildflower displays, though they may be viewed in spring, late summer, and fall, as well. According to Texas Parks and Wildlife, average annual rainfall in the Edwards Plateau ranges from 15 to 34 inches.

The Blackland Prairie extends from the Red River south to San Antonio, bordered on the west by the Edwards Plateau and the Cross Timbers, and on the east by the Post Oak Savannah. Annual rainfall averages 30 to 40 inches, with higher averages to the east. This region is dominated by prairie species. The most common grass species include little bluestem (Schizachyrium scoparium) and Indian grass (Sorghastrum nutans) in the uplands and switchgrass (Panicum virgatum) in the riparian areas and drainages. Common herbaceous flowering plants include salvias, penstemons, and silphiums. This area has suffered greatly from overgrazing and agricultural use. Few intact areas remain, though many of the plants can be found along county roadsides throughout the region.

Our fall Symposium host chapter, the Tonkawa Chapter, includes both of these ecoregions.

Source: Wildflowers of Texas by Michael Eason