The herbarium was founded in 1921 but most of the collections are recent. Our collection primarily represents the West Cross Timbers of Texas with the earliest work being a 1920s flora for Erath County, where the herbarium is located. Since that time, there have been many additions to the flora of the West Cross Timbers of Texas. We also have many voucher specimens from several ecological investigations in the region and from a floristic project at Padre Island National Seashore in southeast Texas.