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Austin Chapter

Tour of the Herbarium Collection at the University of Texas at Austin

In August, two groups from NPSOT Austin toured the herbarium collection at the University of Texas at Austin. Dr. George Yatskievych, the collection’s curator, spoke to the groups about the history of the herbarium and the more than 1 million plant specimens in the collection. He showed a plant specimen of Galápagos Leatherleaf (Maytenus octogona) collected from the Galápagos Islands by Charles Darwin in 1835. About a quarter of the collection is plants from Texas, making it the largest collection of Texas plants in the world.

The plant specimens in the collection have been collected, pressed, dried, and preserved. Each plant has a label, and 550,000 plant specimens have had their label transcribed into databases. About half of those have also been imaged digitally. Many of these records are available for anyone to view in their online portal. A surprising aspect of the collection is that it is entirely housed in the UT Tower. The collection is spread across nine floors! Its location on campus makes it convenient for students to do research and volunteer.

The herbarium encourages the use of their collections by both scientists and plant enthusiasts. Anyone can submit a physical plant specimen. The collection grows by about 7,000-8000 each year. It is encouraged to read their guidelines on processing specimens. Additionally, they welcome volunteers who work on campus with the collection and remotely with their data.

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About the Region

New Braunfels, the location of our Fall 2024 Symposium, straddles both the Edwards Plateau Ecoregion and the Blackland Prairie ecoregion. Interstate 35 divides the city of New Braunfels; its path through the city closely parallels the boundary of these two ecoregions, with the Edwards Plateau on the west side and the Blackland Prairies region to the east. 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 four host chapters (New Braunfels, Lindheimer, Guadalupe, and the Hill Country chapters) are located in one or both of the ecoregions above. However, the eastern portion of Guadalupe County also falls within the Post Oak Savanna ecoregion. Annual rainfall averages 35 to 45 inches, with higher averages to the east. A wide variety of hardwood trees are found, including several species of oaks, elms, and in the Bastrop area, loblolly pine (Pinus taeda). Grasses and forbs dominate in the open savannas, with most common grass being little bluestem. Ranching, agriculture, and fire suppression have allowed woody species to encroach on the once-open savannas.

Source: Wildflowers of Texas by Michael Eason