P. V. Heath 1994, as a species Opuntia kelvinensis V. Grant & K. A. Grant 1971
Cylindropuntia xkelvinensis is a naturally occurring hybrid, C. fulgida x C. spinosior. Distribution: Arizona.
Cylindropuntia kleiniae (A. P. de Candolle) F. M. Knuth 1935
cardoncillo, klein's cholla, tasajillo, tasajo Opuntia kleiniae A. P. de Candolle 1828 Opuntia wrightii Engelmann 1857
Opuntia recóndita Griffiths 1913, Cylindropuntia recóndita (Griffiths) F. M. Knuth 1935
Plants scraggly shrubs with open branching, 0.5-2.5 m (2098 in) high. Stem segments 4-20 cm (1.6-7.9 in) long, 0.61.2 cm (0.2-0.5 in) in diameter, with obvious tubercles. Areoles with yellow wool, becoming dark with age, oval. Glo-chids yellow, 0.5-2.5 mm long. Spines 1-4, on most areoles, sometimes absent, not obscuring the stems, needle-like, yellow to gray with light tips, straight to slightly curved, commonly bent backward, 1-3 cm (0.4-1.2 in) long. Flowers greenish basally to red or magenta above. Fruits obovoid to cylindrical, fleshy, spineless, green, becoming red, 1.3-3.4 cm (0.5-1.3 in) long, 1-2 cm (0.4-0.8 in) in diameter. Distribution: Chihuahuan Desert of New Mexico and Texas, and Co-ahuila, Chihuahua, Durango, and Nuevo León, Mexico.
Cylindropuntia leptocaulis (A. P. de Candolle) F. M. Knuth 1935
alfilerillo, catalinaria, desert christmas cactus, desert christmas cholla, tasajillo, tasajo Opuntia leptocaulis A. P. de Candolle 1828 Opuntia frutescens Engelmann 1845 Opuntia vaginata Engelmann 1848 Opuntia brittoniiJ. G. Ortega 1928, Cylindropuntia brittonii (J. G. Ortega) Backeberg 1958
Plants shrubby or treelike, variously branched, 0.5-1.8 m (20-71 in) high, usually with numerous short, spineless stems along major axes. Stem segments very slender, gray-green to purplish, 20-80 cm (7.9-31 in) long, 3-5 mm in diameter, without prominent tubercles. Areoles with white to yellow wool, becoming gray with age, broadly elliptical. Glochids yellow to reddish brown, 1-5 mm long. Spines 0-1, sometimes as many as 3, concentrated on apical areoles, evenly distributed on segments, reddish brown with white or gray coats, round in cross section, angular-flattened basally, erect, flexible, straight or curved, 1.4-4.5 cm (0.6-1.8 in) long; sheaths gray, purplish gray, or yellow. Flowers pale yellow to greenish yellow, sometimes with reddish tips. Fruits obovoid, smooth, spineless, fleshy, green, often with purple tint, becoming yellow to red at maturity, 0.9-1.5 cm (0.4-0.6 in) or more long, 6-7 mm (0.2-0.3 in) in diameter. Distribution: widespread in deserts, grasslands, chaparral, and woodlands in Arizona, New Mexico, Oklahoma, and Texas, and Chihuahua, Coahuila, Durango, Nuevo León, Sonora, San Luis Potosí, Tamaulipas, and Zacatecas, Mexico.
Cylindropuntia lindsayi (Rebman) Rebman 2001 Opuntia lindsayi Rebman 1997
Plants shrubby, from densely compact to nearly vinelike, distinctly single-stemmed growth, producing many short, easily detached lateral branches, 0.4-3 m (1.3-9.8 ft) high. Stem segments very slender, green to gray-green, with purple around areoles, often glaucous, 1.5-9 cm (0.6-3.5 in) long, 4-8 mm (to 0.3 in) in diameter. Areoles cream, aging gray. Glochids sometimes conspicuous, orangish brown, 2-3 mm long, often several bristle-like, gray. Spines 1-3, on most areoles, commonly absent, stout, white to gray, with yellowish tips, 1-3.7 cm (0.4-1.5 in) long; sheaths gray to yellowish, baggy. Flowers light green to greenish yellow. Fruits fleshy, spiny, often proliferating, green to red, often sterile, 1.8-2.8 cm (0.7-1.1 in) long, 7-9 mm (0.3-0.4 in) in diameter. Distribution: southern Baja California and throughout Baja California Sur, Mexico, except for the cape region.
Cylindropuntia molesta (T. Brandegee) F. M. Knuth 1935
Opuntia molesta T. Brandegee 1889
Opuntia clavellina Engelmann 1896, Cylindropuntia clavellina (Engelmann) F. M. Knuth 1935, C. molesta var.clavellina (Engelmann) Rebman 2001
Plants shrubby with open and sometimes basal branching,
1-2.5 m (3.3-8.2 ft) high. Stem segments cylindrical, ascending, widely club shaped, firmly attached, green or somewhat glaucous, 5-40 cm (2-16 in) long, 1.5-2.5 cm (0.6-1 in) in diameter, with large wide tubercles. Areoles widely elliptical, with yellowish brown wool. Glochids yellowish brown, 1-2.5 mm long. Principal spines 1-5, reddish with yellowish tips, becoming purplish or almost black with age,
2-5 cm (0.8-2 in) long. Secondary spines 2-7, finer, 0.5-1.2 cm (0.2-0.5 in) long. Flowers bronze-purple, 3-5 cm (1.2-2 in) in diameter. Fruits widely obovoid, fleshy, yellow, distinctly tuberculate, spiny, 2.5-3.5 cm (1-1.4 in) long. Distribution: Baja California Peninsula, Mexico.
Two varieties of Cylindropuntia molesta are recognized. Variety molesta tends to be treelike to 2.5 m (8.2 ft) high and usually has 3-5 projecting central spines with bronze sheaths; it occurs in volcanic soils. Variety clavellina is shrubby to 1.5 m (4.9 ft) high and usually has only one erect central spine; it occurs in northern Baja California Sur and in Baja California.
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