Peniocereus tepalcatepecanus Snchez Mejorada 1974

Plants shrubby, often weedy, erect at first, later arching, rarely branching, 60-130 cm (24-51 in) high. Roots carrotlike, to 35 cm (14 in) long, 8-12 cm (3.1-4.7 in) in diameter, pale brown, sometimes forked. Stems dimorphic. Young stems erect, formed by one or more triangular branches, 30-40 cm (12-16 in) long, 0.9-1 cm (0.4 in) in diameter, more or less triangular in cross section, dark green, central spines 1-3, erect, radial spines 6-7. Older stems almost round in cross section, 1.6-2.2 cm (0.6-0.9 in) in diameter, with 3-4 in conspicuous ribs that are obtuse and rounded, dull green with many white spots, becoming almost white, central spines 3, short, conical, radial spines 9, appressed, conical, short. Flowers not known. Fruits oblong, 5.5-7.5 cm (2.2-3 in) long, pulp red. Distribution: Michoacán, Mexico. Peniocereus tepalcatepecanus is poorly known.

Peniocereus viperinus (F. A. C.Weber) F. Buxbaum 1975

cardoncillo, 0rganit0 de víbora

Cereus viperinus F. A. C. Weber 1904, Wilcoxia viperina (F. A. C. Weber) Britton & Rose 1917, Cullmannia viperina (F. A. C. Weber) Distefano 1956

Wilcoxia papulosa Britton & Rose 1920 Wilcoxia tomentosa Bravo 1958

Plants shrubby with numerous branches, to 3 m (9.8 ft) high. Roots fleshy, robust. Stems trailing, elongated, gray-green, 8-20 mm (0.3-0.8 in) in diameter, with dense pubescent felt.

Peniocereus striatus, photograph by Jon Rebman


Peniocereus striatus, photograph by Jon Rebman

566 Peniocereus viperínus

Ribs 8-10 with small black areoles. Central spines 3-4, black, to 6 mm (0.2 in) long, soon deciduous. Radial spines 8-9, black, flattened against the stem surface, to 4 mm long. Flowers open during the day, borne laterally on the stems, glossy red, to 9 cm (3.5 in) long and 4 cm (1.6 in) in diameter, peri-carpels and floral tubes with black bristle-like spines and long white wool. Fruits pear shaped. Distribution: Morelos and Puebla, Mexico.

Peniocereus zopílotensis (J. Meyrán) Buxbaum 1976 Wilcoxia zopilotensis J. Meyrán 1970, Neoevansia zopilotensis (J. Meyrán) Sánchez-Mejorada 1973

Plants shrubby, clambering among bushes, freely branching. Roots tuberous. Stems glabrous, to 4 m (13 ft) long, 1-1.5 cm (0.4-0.6 in) in diameter. Ribs 16-20, inconspicuous, with black areoles. Central spines 1-2, reddish brown, 2-3 mm long. Radial spines 8-10, appressed, needle-like, white, 1.5-3 mm long. Flowers open at night, borne laterally, tubular fiinnelform, whitish to cream, pericarpels with tubercles and scant white wool with a few spines below. Fruits pear shaped to oblong, to 3.5 cm (1.4 in) long. Distribution: Guerrero, Mexico.

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