Frederik Marcus Knuth

Cylindropuntia is a genus of cacti (family Cactaceae), containing species commonly known as chollas ( CHOY-əz), native to northern Mexico and the Southwestern United States. They are known for their barbed spines that tenaciously attach to skin, fur, and clothing. Stands of cholla are called cholla gardens. Individuals within these colonies often exhibit the same DNA, as they were formerly tubercles of an original plant.

Cylindropuntia imbricata, the cane cholla (walking stick cholla, tree cholla, or chainlink cactus), is a cactus found in the Southwestern United States and northern Mexico, including some cooler regions in comparison to many other cacti. It occurs primarily in the arid regions of the Southwestern United States in the states of Kansas, Oklahoma, Texas, New Mexico, Arizona, Colorado, and Nevada. It is often conspicuous because of its shrubby or even tree-like size, its silhouette, and its long-lasting yellowish fruits.

Gymnocalycium andreae is a species of Gymnocalycium from Argentina.

Cylindropuntia leptocaulis, the desert Christmas cactus, desert Christmas cholla, pencil cactus, or tasajillo, is a species of cholla cactus.

Cylindropuntia fulgida, the jumping cholla, also known as the hanging chain cholla, is a cholla (Cylindropuntia) cactus native to Sonora and the Southwestern United States.

Cylindropuntia bigelovii, the teddy-bear cholla, is a cholla cactus species native to Northwestern Mexico, and to the United States in California, Arizona, and Nevada.

Cylindropuntia ramosissima is a species of cactus known by the common names Diamond cholla and Branched pencil cholla.

Frailea phaeodisca is a species of Frailea cactus from Brazil and Uruguay.

Cylindropuntia tunicata, commonly referred to as sheathed cholla, is a species of flowering plant in the family Cactaceae. This cholla species is native to the Chihuahuan Desert of North America and parts of South America. Is also known as Brown-spined Hudson pear.

Cylindropuntia prolifera, known by the common name Coastal cholla, is a species of cactus. In Australia it is called 'Jumping Cholla' because of it seeming to jump from outbreak to outbreak.

Cylindropuntia echinocarpa is a species of cactus known by the common names silver cholla, golden cholla, and Wiggins' cholla. It was formerly named Opuntia echinocarpa.

Cylindropuntia acanthocarpa, commonly referred to as buckhorn cholla, is a cholla native to the Mojave, Sonoran, and Colorado Deserts of North America. Along with Cylindropuntia bigelovii (the "teddy bear" cholla), it is the most common cholla found in these deserts.

Thelocactus conothelos is a species of cactus endemic to Mexico.

Ferocactus haematacanthus is a species of Ferocactus from Mexico.

Cylindropuntia whipplei (formerly known as Opuntia whipplei, common name Whipple cholla) is a member of the cactus family, Cactaceae.

Cylindropuntia molesta is a cactus species that is endemic to Baja California state in Mexico. It grows to a size of 2–8 feet in height and 2–5 feet in width.

Cylindropuntia californica is a species of cholla cactus known by the common name snake cholla. It is primarily found in Baja California, Mexico and the southernmost part of California in the United States. It is characterized by a short, decumbent habit, yellow-green flowers, elongated stems, and short spines. It is mostly found in coastal sage scrub and coastal chaparral habitats, but two varieties in Baja California can be found in foothills and deserts. In California, variety californica is regarded as a rare and threatened plant, with a California Native Plant Society listing of 1B.1, in

Thelocactus hastifer is a species of plant in the family Cactaceae. It is endemic to Mexico. Its natural habitat is hot deserts.

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