Echinocereus papillosus Linke ex Rmpler 1885

yellow alicoche, yellow-flowered alicoche Echinocereus angusticeps Clover 1935

Plants with many stems, forming low clumps to 1 m (3.3 ft) wide. Stems mostly erect, cylindrical, brownish green, to 7

cm (2.8 in) in diameter. Ribs 6-10 with prominent nipplelike tubercles. Central spine one, grayish, to 1.5 cm (0.6 in) long. Radial spines 7-11, diverging, rigid, whitish, 1-1.5 cm (0.4-0.6 in) long. Flowers borne along the sides of the stems, funnelform, fragrant, bright yellow with orange-red to purple throats, 6-9 cm (2.4-3.5 in) long, 8-12 cm (3.1-4.7 in) in diameter. Fruits globose, not well known. Distribution: south Texas and adjacent Tamaulipas, Mexico.

Echinocereus parkeri N. P. Taylor 1988 Echinocereus parkeri var. gonzalezii N. P. Taylor 1988, E. parkeri subsp. gonzalezii (N. P. Taylor) N. P. Taylor 1997 Echinocereus parkeri subsp. arteagensis Blum & Lange 1998 Echinocereus parkeri subsp. mazapilensis Blum & Lange 1998

Plants with many stems, forming compact mounds or spreading clumps. Stems tapering or cylindrical, to 15 cm (5.9 in) high, 2-6 cm (0.8-2.4 in) in diameter. Ribs 6-10, tuberculate. Central spines 1-8, dark, becoming glassy white

Echinocereus pamanesiorum

Echinocereus papillosus

Plants with many stems, forming low clumps to 1 m (3.3 ft) wide. Stems mostly erect, cylindrical, brownish green, to 7

Echinocereus Mazapilensis

Echinocereus papillosus to yellowish, 2-6.5 cm (0.8-2.6 in) long. Radial spines 6-18, usually glassy white, very slender, 0.7—1.2 cm (0.3—0.5 in) long. Flowers borne near the stem tips, funnelform, magenta to deep pink, with white throats, 4.5-5.5 cm (1.8-2.2 in) long, 4.5-6 cm (1.8-2.4 in) in diameter. Fruits globose, green with white pulp, with deciduous glassy white spines. Distribution: Nuevo León, Tamaulipas, San Luis Potosí, and Zacatecas, Mexico.

Four subspecies of Echinocereus parkeri are recognized. Subspecies parkeri occurs in compact mounds with stems

Echinocereus pectinatus subsp. pectinatus

Echinocereus pensilis distincúy tapering toward the tip, and has 7-10 strongly tu-berculate ribs and 10-13 radial spines; it occurs only in Nuevo León. Subspecies arteagensis has 14-18 radial spines and 5-8 centrals; it occurs in Arteaga Canyon on the Coahu-ila-Nuevo León border. Subspecies gonzalezii does not form compact mounds, the stems taper only gradually, the 6-10 ribs are barely tuberculate, and it has 10-14 radial spines and 3-5 centrals; it occurs in Nuevo León, Tamaulipas, and San Luis Potosí. Subspecies mazapilensis has 6-9 radial spines and 1-4 centrals, different seed structure, and occurs at much higher elevations in pine forests near Mazapil, Zacatecas.

Echinocereus pectinatus (Scheidweiler) Engelmann 1848

comb hedgehog cactus, lace cactus, purple candle cactus, rainbow cactus

Echinocactus pectinatus Scheidweiler 1838 Echinocereus pectinatus var. wenigeri L. D. Benson 1968, E. pectinatus subsp. wenigeri {L. D. Benson) Blum & Rutow 1998

Plants usually solitary, globose to cylindrical, 8-35 cm (3.1-14in) high,to 13 cm (5.1 in) in diameter, with the stems obscured by spines. Ribs 12-23, forming low tubercles. Central spines 1-5, sometimes more, yellow to pinkish to brownish, erect or diverging, 1-25 mm (to 1 in) long. Radial spines 1230, interlaced, usually closely pressed to the surface, whitish to pinkish to grayish, 5—15 mm (0.2—0.6 in) long. Flowers borne on the sides of the stems, funnelform, magenta to pink to lavender, or yellow or whitish, with green bases, 5-15 cm (2-5.9 in) long and in diameter. Fruits globose to elliptical, green to purplish, fleshy, with deciduous spines. Distribution: southwestern United States and northern Mexico.

Some recognize Echinocereus pectinatus subsp. wenigeri, which is found in Texas east of the Big Bend region; it typically has 1-3 central spines and magenta flowers.

Echinocereus pensilis (K. Brandegee) J. A. Purpus 1908

hanging cactus, pitayita, snake cactus Cereus pensilis K. Brandegee 1904, Morangaya pensilis (K. Brandegee) G. D. Rowley 1974

Plants usually much branched and tangled. Stems cylindrical, tapering toward the tips, erect but then arching or hanging downward, bright yellowish green, 1-4 m (3.3-13 ft) long, 2-5 cm (0.8-2 in) in diameter, often with aerial roots. Ribs 8-10, rounded and tuberculate. Central spine one, pale yellow, to 2.5 cm (1 in) long. Radial spines 6-10 at first, later as many as 70 or more, pale yellow, more or less radiating. Flowers borne at the stem tip or on older parts, tubular to narrowly funnelform, orange-red, to 6.5 cm (2.6 in) long and 4.5 cm (1.8 in) in diameter. Fruits elongate, spiny, red with red pulp. Distribution: cape region of Baja California Sur, Mexico.

Echinocereus pensilis

Echinocereuspentalophus (A. P. de Candolle) Lemaire 1868

alicoche, cardoncillo, lady finger cactus Cereus pentalophus A. P. de Candolle 1828 Cereus pentalophus [var.] leptacanthus Salm-Dyck 1849, Echinocereus leptacanthus (Salm-Dyck) K. Schumann 1898 Cereusprocumbens Engelmann 1849, Echinocereusprocumbens (Engelmann) Lemaire 1868, E. pentalophus subsp. procumbens (Engelmann) Blum & Lange 1998 Echinocereus leonensis Mathsson 1891, E, pentalophus var. leonensis (Mathsson) N. P. Taylor 1985, E. pentalophus subsp. leonensis (Mathsson) N.P.Taylor 1997

Plants much branched, forming low, sprawling clumps to 1 m (3.3 ft) wide. Stems stiff, cylindrical, erect to somewhat prostrate, yellowish green to gray-green, 20-70 cm (7.9-28 in) long, 1-6 cm (0.4-2.4 in) in diameter. Ribs 3-8, usually acute, straight, becoming tuberculate. Central spine 0-1, erect, yellowish to dark brown, to 3 cm (1.2 in) long. Radial spines 3-8, to 2 cm (0.8 in) long, straight, whitish to yellowish, upper ones very small. Flowers not arising near the stem tips, broadly funnelform, bright pink to pinkish magenta, with white or yellow throats, 8-10 cm (3.1-3.9in) long, 1015 cm (3.9-5.9 in) in diameter. Fruits ovoid, green, with brown spines and loose wool, irregularly dehiscent. Distribution: south Texas, south into Coahuila, Tamaulipas, Nuevo Leon, Guanajuato, San Luis Potosi, Hidalgo, and Queretaro, Mexico.

Three subspecies of Echinocereus pentalophus are recognized. Subspecies pentalophus has either erect or prostrate stems with 3-5 ribs, and 3-7 spines; it occurs throughout the range of the species. Subspecies leonensis has erect stems with 6-8 ribs, and as many as 9 spines; it is found only in Coahuila and Nuevo Leon. Subspecies procumbens has semipros-trate stems, 4-5 ribs, and 5-7 spines; it occurs from the Rio Grande south into Tamaulipas.

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