Pachycereus granis Rose 1909

Plants treelike, densely branched, to 25 m (82 ft) high with trunks to 1 m (3.3 ft) in diameter. Stems pale green, erect, columnar, with constrictions. Ribs 9-11, bearing areoles set well apart. Central spines 3, grayish white, to 6 cm (2.4 in) long, lowermost one longer. Radial spines 9-10, somewhat flattened, short. Pseudocephalia apical, large, with numerous long spines or bristles. Flowers somewhat small, white, to 4 cm (1.6 in) long; pericarpels and floral tubes with small acuminate scales and wool. Fruits globose, dry, 7.5 cm (3 in) in diameter, covered with yellow bristles. Distribution: More-los, México, and Puebla, Mexico.

Pachycereus gatesii

Pachycereus gaumeri, photograph by Charles Glass

Pachycereus gaumeri, photograph by Charles Glass

534 Pachycereus hollianus

Pachycereus hollianus (F. A. C. Weber) Buxbaum 1961

acompes, baboso

Cereus hollianus F. A. C. Weber 1896, Lemalreocereus hollianus (F. A. C. Weber) Britton & Rose 1909

Plants columnar, solitary or branching basally, 4-5 m (13-16 ft) high. Stems gray-green, 5-7 cm (2-2.8 in) in diameter. Ribs 8-14. Central spines 3-5, reddish, becoming gray or black, expanded at their bases, 3-10 cm (1.2-3.9 in) long, the longest pointing downward. Radial spines 12-14, reddish, becoming gray, unequal in size, 1-3.5 cm (0.4-1.4 in) long. Pseudocephalia not evident. Flowers borne apically, open during the day, widely tubular to bell shaped, white, 7-10 cm (2.8-3.9 in) long, 3-3.5 cm (1.2-1.4 in) in diameter; peri-carpels and floral tubes with small triangular scales and white wool and spinelike hairs. Fruits ovoid, 6-8 cm (2.4-3.1 in) long, reddish, covered with spines and white hairs, pulp purple. Distribution: Puebla, Mexico. Pachycereus hollianus is cultivated for use as a living fence (Chapter 2, under Other Uses of Cacti).

Pachycereus lepidanthus (Eichlam) Britton 8c Rose 1920 Cereus lepidanthus Eichlam 1909, Anisocereus lepidanthus (Eichlam) Backeberg 1938, Escontria lepidantha (Eichlam) Buxbaum 1961

Plants treelike, columnar, 3-4 m (9.8-13 ft) high. Stems solitary or producing a few branches basally, light green, to 8 cm (3.1 in) in diameter. Ribs 7-9, low, triangular, separated by low valleys. Spines poorly differentiated as centrals and ra-dials, yellowish, becoming gray. Central spines 3, to 6 cm (2.4 in) long, upper ones directed upward, lower one slightly inclined downward. Radial spines about 10, rigid, 1.5 cm (0.6 in) long. Flowers arising near the stem tips from older areoles, funnelform, yellow to yellowish orange, to 7 cm (2.8 in)

Pachycereus I hollianus |

long, 2.5 cm (1 in) in diameter; pericarpels and floral tubes densely covered with membranous, leaflike scales. Fruits dry. Distribution: Guatemala. Pachycereus lepidanthus is poorly known, rare in cultivation, and of uncertain relationship.

Pachycereus marginatus (A. P. de Candolle) Britton 8c Rose 1909

chi layo, mexican fence post cactus, organ cactus, órgano Cereus marginatus A. P. de Candolle 1828, Lemaireocereus marginatus (A. P. de Candolle) A. Berger 1929, Marginatocereus marginatus (A. P. de Candolle) Backeberg 1942, Stenocereus marginatus (A. P. de Candolle) Buxbaum 1961 Cereus gemmatus Zuccarini 1837, Stenocereus marginatus var. gem-matus (Zuccarini) Bravo 1974

Plants treelike, columnar, erect, solitary or sometimes branching, 3-5 m (9.8-16 ft) high. Stems light green, 8-20 cm (3.17.9 in) in diameter. Ribs 4-7, elevated, wide, with large areoles becoming confluent. Central spines 1-3, yellowish to gray, 10-15 mm (0.4-0.6 in) long. Radial spines 5-9, 2-4 mm long, yellowish to grayish. Flower-producing areoles with numerous bristles to 2 cm (0.8 in) long, subterminal. Flowers funnelform, reddish, 3-4 cm (1.2-1.6 in) long; pericarpels and floral tubes bearing scales in association with wool and bristles. Fruits globose, somewhat dry, to 4 cm (1.6 in) in diameter, covered with spines and wool that fall away. Distribution: Hidalgo, México, Guanajuato, Querétaro, Mo-relos, Puebla, Oaxaca, Colima, Michoacán, and Guerrero, Mexico. Pachycereus marginatus is cultivated for use as a living fence (Chapter 2, under Other Uses of Cacti).

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