Lyman David Benson

Pediocactus bradyi is a very rare species of cactus known by the common names Brady's pincushion cactus, Brady's hedgehog cactus, and Marble Canyon cactus. It is endemic to Arizona in the US, where it is restricted to Marble Canyon in Coconino County, though its exact distribution is not generally advertised due to poaching concerns. It is limited to a specific type of soil, it has a small distribution, and the species is threatened by a number of human activities. This has been a federally listed endangered species of the United States since 1979.

Sclerocactus mesae-verdae, the Mesa Verde cactus or Mesa Verde fishhook cactus, is a species of cactus native to northwestern New Mexico and southwestern Colorado. It is known only from Montezuma County (Colorado) and San Juan County (New Mexico). Much of the New Mexico part of the range lies inside land controlled by the Navajo Nation. The Colorado populations lie close to Mesa Verde National Park.

Sclerocactus wrightiae is a rare species of cactus known by the common names Wright's little barrel cactus and Wright's fishhook cactus. Dr. Lyman Benson named this species for North American cactus expert Dorde Wright Woodruff, who initially discovered it in 1961 and brought it to the attention of Dr. Benson. Dr. Benson and Ms. Woodruff later collaborated in connection with other Sclerocactus taxa in the Intermountain West.

Sclerocactus glaucus is a rare species of cactus known by the common name Colorado hookless cactus. It is endemic to Colorado in the United States, where it is known only from the area between Grand Junction and Montrose. It is a federally listed threatened species. The description of this species formerly included plants now belonging to Sclerocactus brevispinus and Sclerocactus wetlandicus, two cacti endemic to Utah. When the second of the two species was separated in 1994, the name S. glaucus was applied only to plants found in Colorado; it made the common name Uinta Basin hookless cactus

Epithelantha bokei is a species of cactus known by the common names pingpong ball cactus and button-cactus. It is native to Texas in the United States and Coahuila in Mexico. This cactus is disc-shaped or cylindrical and usually unbranched. It has a flat top. It usually measures 2 to 5 centimeters in width. It is so thickly covered in pale-colored spines that it is white or yellowish in color. There are up to 90 on each areole. The longest are about 7 millimeters in length. The delicate pale pink flowers are up to 1.7 centimeters long and wide. The red fruit is about a centimeter long. Much

Sclerocactus pubispinus is a species of Sclerocactus found from Nevada to Utah.

Pediocactus sileri is a rare species of cactus known by the common names Siler's pincushion cactus and gypsum cactus (or gypsum plains cactus). It is native to southwestern Utah and northwestern Arizona in the United States. It is limited to a specific type of soil, individuals are often spaced far apart, and the species is threatened by a number of human activities such as off-road vehicle use, poaching, and uranium mining. This is a federally listed threatened species of the United States.

Pediocactus peeblesianus is a rare species of cactus known by the common names Navajo pincushion cactus. It is endemic to the state of Arizona in the United States. The species is named after the Arizona botanist Robert Hibbs Peebles.

Pediocactus knowltonii is a rare species of cactus known by the common names Knowlton's miniature cactus, Knowlton's pincushion cactus, and Knowlton's minute cactus.

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Echinocereus fasciculatus, commonly known as pinkflower hedgehog cactus, is a clumping cactus (Cactaceae) with brilliant magenta flowers and long spines found in the Sonoran Desert.

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Haplophyton crooksii is a plant species native to Arizona, New Mexico, Texas, and northern Mexico. It is an herb up to 60 cm tall, with showy yellow flowers, found on rocky slopes in desert scrub and desert grassland. The plant is commonly called the cockroach plant (or hierba de la cucaracha) because of its insecticidal properties.

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Ranunculus austro-oreganus, the Southern Oregon buttercup, is a plant species endemic to the region around Medford, Oregon. It grows on grassy areas at elevations less than 500 m (1650 feet). Ranunculus austro-oreganus is an erect to ascending herb not rooting at the nodes. Leaves are 3-parted, up to 5 cm (2 inches) long and about as wide. Flower petals are each up to 12 mm (0.5 inches) long, yellow with prominent red veins visible on the back but not on the front. Achenes are hemispheric with a persistent straight or curved beak. The species is closely related to R. occidentalis.

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