Cylindropuntia xfosbergii C B Wolf Backeberg 1958

mason valley cholla Opuntia fosbergii C. B. Wolf 1938

Opuntia bigeiovii var. hoffmannii Fosberg 1933, Cylindropuntia bigeiovii var. xhoffmannii (Fosberg) Backeberg 1966

Cylindropuntia xfosbergii is a naturally occurring hybrid, C. bigeiovii x C. echinocarpa. Distribution: California.

Cylindropuntia fulgida (Engelmann) F. M. Knuth 1935 boxing-glove cactus, boxing-glove cholla, brinkad0ra, chain-fruit cholla, club cactus, jumping cholla, smooth chain-fruit cholla, sonoran jumping cholla Opuntia fulgida Engelmann 1856

Opuntia mamillata Schott 1856,0. fulgida var. mamillata (Schott) J. M. Coulter 1896, Cylindropuntia fulgida var. mamillata (Schott) Backeberg 1958

Plants treelike with much branched, spreading crowns, 1-3 m (3.3-9.8 ft) high with widely spreading, branching trunks. Stem segments spiny all over, gray-green, becoming blackish, terminal segments easily dislodged, 6-23 cm (2.4-9.1 in) long, 2-3.5 cm (0.8-1.4 in) in diameter, with broadly oval tubercles. Areoles with gold to tan wool, becoming gray to black with age, triangular. Glochids yellow, 1-3 mm long. Spines 0-18, on most areoles or nearly absent, yellow but aging darker, erect to spreading to bent downward, the longest to 3.5 cm (1.4 in); sheaths whitish to yellowish, baggy or tight fitting. Flowers open in late afternoon, pink to magenta. Fruits obconical, proliferating into long pendulous chains, fleshy, gray-green, mostly spineless, 2-5.5 cm (0.82.2 in) long, 1.3-4.5 cm (0.5-1.8 in) in diameter, with obscure tubercles. Distribution: Sonoran Desert of Arizona, and Sonora, Sinaloa, and Baja California, Mexico.

Fruits of Cylindropuntia fulgida are harvested, and the gum of the plant is used medicinally (Chapter 2, under Cacti as Food, and Cacti as Medicine). Two varieties of C. fulgida are often recognized. Variety fulgida has interlaced spines to 3.5 cm (1.4 in) long, with baggy sheaths. Variety mamillata has only slightly interlacing spines to 2 cm (0.8 in) long, with tight-fitting sheaths.

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