Cylindropuntia xtetracantha Toumey f M Knuth

1935, as a species popular cholla Opuntia tetracantha Toumey 1893

Cylindropuntia xtetracantha is a naturally occurring hybrid, C. acanthocarpavar. majorX C. leptocaulis. Distribution: Arizona.

Cylindropuntia spinosior

Cylindropuntia tesajo (Engelmann) f. M. Knuth 1935 pencil cholla, tesaj0 Opuntia tesajo Engelmann 1896 Opuntia cineracea Wiggins 1943

Plants low and sprawling to short and erect shrubs, 20-80 cm (7.9-31 in) high with frequent dichotomous or tricho-tomous branching. Stem segments very slender, pale green to brownish green, with purple tinge around areoles, glabrous to papillate, 3-11.5 cm (1.2-4.5 in) long, 0.5-1.2 cm (0.2-0.5 in) in diameter, with low and inconspicuous tubercles. Areoles cream to gray. Glochids conspicuous, yellow to rust, 2-4 mm long. Spines restricted to uppermost areoles, sometimes absent. Principal spine 0-1, erect, yellow to orange, sheathed,

Cylindropuntia thurberi (Engelmann) F. M. Knuth 1935 Opuntia thurberi Engelmann 1856

Opuntia alamosensis Britton & Rose 1926, Cylindropuntia alamosen-sis (Britton & Rose) Backeberg 1958

Plants shrubby with dispersed, separated branches, 1.5-4 m (4.9-13 ft) high. Stem segments thin, long, green with purplish or reddish tint, sometimes glaucous, 10-25 cm (3.9-9.8 in) long, 1-1.5 cm (0.4-0.6 in) in diameter, with wide tubercles. Areoles with yellowish or brown wool, round to elliptical. Glochids present or absent. Spines 3-7, spreading, needle-like, delicate, yellow to brownish, 0.5-1.2 cm (0.2-0.5 in) long; sheaths yellowish, papery. Flowers brownish to lemon yellow. Fruits obovoid, spineless, 2-3 cm (0.8-1.2 in) long. Distribution: Sonora and Sinaloa, Mexico.

Cylindropuntia tunicata (Lehmann) F. M. Knuth 1935

abr0j0, clavellina, c0y0n0xtle, sheathed cholla, tencholote

Cactus tunicatus Lehmann 1827, Opuntia tunicata (Lehmann) Link &

Otto 1837 Opuntia puelchana A. Castellanos 1928

Plants densely branched shrubs, 30-60 cm (12-24 in) high, with segments easily detached. Stem segments pale green to green, 5-25 cm (2-9.8 in) long, 1.5-2.5 cm (0.6-1 in) in diameter, with very prominent broad tubercles. Areoles with yellowto tan wool, aging gray, triangular. Glochids pale yellow, 0.5-1.2 mm long. Spines 5-12, on most areoles, obscuring the stems, yellow, needle-like, spreading, 3-6 cm (1.2-2.4 in) long; sheaths very loose fitting, persistent, yellowto tan. Flowers yellow to yellowish green, to 3 cm (1.2 in) long and in di-

Cylindropuntia tunicata

Cylindropuntia tunicata

ameter. Fruits top shaped to club shaped, red, mostly sterile, usually spineless, pulpy, tubercles evident. Distribution: Chi-huahuan Desert, probably in Texas, throughout northern Mexico, also in Chile and Ecuador though it was probably carried by humans or livestock into South America and is not native there. Stems and roots of Cylindropuntia tunicata are used medicinally, and the cactus is cultivated for use as a living fence (Chapter 2, under Cacti as Medicine, and Other Uses of Cacti).

Cylindropuntia versicolor (Engelmann ex J. M. Coulter) F.M. Knuth 1935

morada cholla, staghorn cholla

Opuntia versicolor Engelmann exJ. M. Coulter 1896

Plants treelike or shrubby, openly branching at acute angles, to 2 m (6.6 ft) high. Stem segments greenish purple to purple, 4-18 cm (1.6-7.1 in) long, 1-2 cm (0.4-0.8 in) in diameter, with prominent elongate tubercles. Areoles with tan to brown wool, aging gray, rounded. Glochids dark yellow, to 1 mm long. Spines 6-8, on all areoles, somewhat interlacing, short, golden, some bristle-like; sheaths yellow to brownish. Distal spines erect to spreading, reddish brown, 0.6-1.1 cm (0.2-0.4 in) long. Basal spines whitish to reddish brown, bent backward, somewhat flattened, 1-1.8 cm (0.4-0.7 in) long. Flowers yellowish green, yellow, bronze, red, rose, or magenta. Fruits obovate, leathery fleshy, spineless, often proliferating, yellowish green, often tinged with red or purple, 2.5-4 cm (1-1.6 in) long, 1-2 cm (0.4-0.8 in) in diameter. Distribution: Sonoran Desert of Arizona, and Sonora, Mexico.

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