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Pediocactus knowltonii, Knowlton's Miniature Cactus, is one of the rarest cacti in the United States, endemic to a single small area on the New Mexico–Colorado border and listed as federally endangered since 1979.
The Peebles Navajo Cactus (Pediocactus peeblesianus) is a rare, miniature globose cactus endemic to the Navajo County region of Arizona. It is a federally listed endangered species that exists in small, scattered populations on the Colorado Plateau. The plant is adapted to high-desert environments a...
Sneed's Pincushion (Escobaria sneedii) is a small, rare species of cactus native to the Chihuahuan Desert ecoregion of North America. It is known to exist only in a few isolated populations growing on limestone cliffs and rocky slopes, primarily located within the Organ Mountains of southern New Mex...
Pediocactus bradyi, Brady's Pincushion Cactus, is a federally endangered US species endemic to a small area of the Marble Canyon region in Arizona, first described in 1958 and protected under the Endangered Species Act.
Sclerocactus wrightiae, commonly known as Wright's fishhook cactus, is a small barrel cactus endemic to a limited area of Utah, primarily in Emery and Wayne counties. It is listed as a federally endangered species due to its restricted range and threats including illegal collection and habitat distu...
Pediocactus despainii, commonly known as the San Rafael cactus, is a small, rare succulent endemic to central Utah. It is strictly restricted to the San Rafael Swell region within Emery and Sevier counties, where it grows in sparse desert shrublands on undisturbed soil. The cactus is characterized b...
Coryphantha robustispina is a federally threatened pincushion cactus endemic to grasslands of southern Arizona and Sonora, Mexico, listed under the US Endangered Species Act due to severe habitat loss.
The Siler pincushion (Pediocactus sileri) is a rare, small cactus species native to the arid regions of the Arizona Strip and adjacent areas in southwestern Utah. It is highly adapted to surviving in harsh, selenium-rich gypsiferous soils that are toxic to the vast majority of plant life. The plant...
Tobusch fishhook cactus (Ancistrocactus brevihamatus) is a small, rare cactus endemic to the Edwards Plateau region of Texas. Named after Fred Tobusch, the plant features hooked central spines and yellowish-green flowers. It was listed as a federally endangered species due to severe habitat loss, pr...
