Big Bend Chapter

Medicinal and Poisonous Plants of the Chihuahuan Desert

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Feb. 18, 10 a.m. to noon ~ Medicinal and Poisonous Plants of the Chihuahuan Desert.

The Big Bend chapter of the Native Plant Society of Texas will explore poisonous and medicinal plants of the Chihuahuan Desert in a class from 10 a.m. to noon on February 18 in the Warnock Science Building 201 on the Sul Ross Campus. Dr. Martin Terry, biology professor at Sul Ross will present the program.

“It’s often true,” said Big Bend chapter president Dallas Baxter, that a plant has both properties, depending on which part of the plant is used, how it’s ingested and the size of the dosage.”

Datura, also known as Jimsonweed, is well known for its large, fragrant tubular blooms. “Datura has been used medicinally for the treatment of asthma (administered by inhalation of the smoke), and also as a hallucinogen, self-administered as a tea by naive teenagers, who do it once and never again because of the aversive systemic effects on the autonomic nervous system,” said Terry. In this case, “aversive” means fatal.

Reservations are necessary and may be made by calling or e-mailing Fonda Ghiardi at 432.426.2363 or fondag@sbcglobal.net.  Members attend at no cost; guests are welcome and are asked to make a $5 donation.

The mission of the Native Plant Society is the research, conservation and utilization of native plants and plant habitats of Texas through education, outreach and example. Membership information is available at the meeting.

The Warnock Science Building is on the east side of the Sul Ross campus; parking is available next door behind the Fine Arts Building

 

Photo of Datura wrightii (Solanceae). Jimson weed. By Michael Eason

 

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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