Peniocereus rosei J G Ortega 1926

Plants more or less erect, branches curved downward, to 2 m (6.6 ft) high. Roots fleshy, tuberous, dirty yellowish white, 8-10 cm (3.1-3.9 in) in diameter. Stems green, 30-80 cm (12-31 in) long, 1-1.5 cm (0.4-0.6 in) in diameter, dark below each areole, with many tiny white spots. Ribs 4-5 in young stems, stems nearly round when mature. Spines 1-2 at first, later 8-9, yellow, thin, pointing downward, sometimes absent. Flowers white, to 10 cm (3.9 in) in diameter; pericarpels tuberculate and with wool and spines. Fruits ovoid, to 3 cm (1.2 in) long. Distribution: Sinaloa and Jalisco, Mexico.

Peniocereus serpentinus (Lagasca & J. D. Rodriguez) N. P. Taylor 1987

junco, junco espinoso, mexican night-blooming cereus, pitahayita, reina de la noche, serpent cactus, snake cactus Cactus serpentinus Lagasca &J. D. Rodriguez 1801, Cereus serpentinus {Lagasca &J. D. Rodriguez) A. P. deCandolle 1828, Echinoce-reus serpentinus (Lagasca & J. D. Rodriguez) Lemaire 1868, Nyctocereus serpentinus (Lagasca &J. D. Rodriguez) Britton & Rose 1909 Nyctocereus castelianosii Scheinvar 1984

Peniocereus serpentinus, photograph by Charles Glass

Peniocereus viperinus 565

Plants shrubby, often forming clumps of many clambering or creeping stems. Roots tuberous. Stems erect or slightly pendent, to 3 m (9.8 ft) long, 2-5 cm (0.8-2 in) in diameter. Ribs 10-12, slightly rounded. Spines 10-12, whitish to brownish, with darker tips, 10-30 mm (0.4-1.2 in) long. Flowers open at night, funnelform, white with pinkish tint, to 25 cm (9.8 in) long and 15 cm (5.9 in) in diameter; pericarpels and floral tubes with bristies. Fruits globose or ovoid, to 4 cm (1.6 in) long. Distribution: Morelos, México, Oaxaca, and Mi-choacán, Mexico. Peniocereus serpentinus is one of the most widely cultivated and spectacular species in the genus. The fruits are eaten (Chapter 2, under Cacti as Food).

Peniocereus striatus (T. Brandegee) Buxbaum 1975

cardoncillo, dahlia-rooted cereus, jacamatraca, sacamatraca

CereusstriatusT. Brandegee 1891, Wilcoxiastriata (T. Brandegee) Britton & Rose 1909, Neoevansia striata (T. Brandegee) Sánchez-Mejorada 1973

Cereus diguetii F. A. C. Weber 1895, Neoevansia diguetii (F. A. C. Weber) W. T. Marshall 1941, Wilcoxia diguetii (F. A. C. Weber) Peebles 1949, Peniocereus diguetii (F. A. C. Weber) Backeberg 1951

Plants shrubby, inconspicuous, vinelike, producing numerous stems, to 1 m (3.3 ft) high. Roots in clusters, each ending in tubers 30-40 cm (12-16 in) long, tan. Stems erect or sub-erect, very slender, brownish green to gray-green, 30-100 cm (12-39 in) long, to 0.6 cm (0.2 in) in diameter, slender basally, branching above, appearing to have long narrow furrows. Ribs 6-9, narrow, broad, low. Central spines 2, white, straight, pointing downward, to 3 mm long. Radial spines 9-10, flattened against the stem surface, small, whitish, some with dark tips, straight. Flowers usually open during the day, reddish purple, 7.5-15 cm (3-5.9 in) long, 5.5-7.5 cm (2.2-3 in) in diameter; pericarpels and floral tubes with bristle-like spines and wool. Fruits pear shaped, to 4 cm (1.6 in) long, pulp red. Distribution: southern Arizona, and Baja California and Sonora, Mexico. Peniocereus striatus is used medicinally by the Seri (Chapter 2, under Cacti as Medicine).

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