JACKIE M. POOLE is a botanist in the Wildlife Diversity Program of the Texas Parks and Wildlife Department. She has been working with the rare plants of Texas since 1982. WILLIAM R. CARR, a botanist with The Nature Conservancy of Texas, conducts numerous field surveys and inventories for the conservation of threatened habitat. DANA M. PRICE is a botanist at the Texas Parks and Wildlife Department with experience in prairie ecology and economic botany. JASON R. SINGHURST, a botanist and phytogeographer at the Texas Parks and Wildlife Department, manages GIS and remote sensing land cover classification projects and conducts status surveys of rare plants in Texas.