The U.S. Fish and Wildlife Service has declared the bracted twistflower, native to the Edwards Plateau, a threatened species, a month after putting another Texas plant on the endangered list.
A Botanical Guide to Texas Wildflowers
The Institute for Regional Conservation
Rare San Antonio-area wildflower could be deemed 'threatened' under Endangered Species Act
Rare northern California wildflower designated endangered – Times-Standard
A True Rarity ~ Texas Trailing Phlox
Groups to US: Protect Nevada flower from mine or face court
Rare Texas wildflower gets protection under Endangered Species Act
Native wildflowers under threat
Rare Plants donated to Butterfly Learning Garden — Phil Hardberger Park Conservancy
Rare Plant Conservation and Reintroduction Natural History of Ecological Restoration
Endangered Species Act Lists Rare Wildflower in Central Texas as Threatened — Westward
The ESA is 50 years old—here are 50 species that are recovering.
The Rogue Wildflower Hunters of Texas
Texas Cactus Deemed Endangered-Do Not Chop or Bring Home! - Texas Fish & Game Magazine