K. Schumann 1894 cardon blanco
Cereus columna-trajani Karwinsky ex Pfeiffer 1837, Pilocereus columna-trajani (Karwinsky ex Pfeiffer) Lemaire 1839, Pachycereus columna-trajani (Karwinsky ex Pfeiffer) Britton & Rose 1909, Haseltonia columna-trajani (Karwinsky ex Pfeiffer) Backeberg 1960 Pilocereus hoppenstedtii F. A. C. Weber 1864, Cephalocereus hoppen-stedtii (F. A. C. Weber) K. Schumann 1894, Cereus hoppenstedtii (F. A. C. Weber) Berger 1905, Haseltonia hoppenstedtii (F. A. C. Weber) Backeberg 1949
Plants erect, unbranched, 6-10 m (20-33 ft) high. Stems green, to 40 cm (16 in) in diameter. Ribs 16-26, almost divided into tubercles by cross-furrows. Areoles white, those near the stem tips with abundant white silky hairs. Central spines 5-8, downward pointing, stiff, grayish, to 8 cm (3.1 in) long. Radial spines 14-18, white, to 1 cm (0.4 in) long. Pseudocephalia clearly lateral, usually facing north, narrow, 2-3 m (6.6-9.8 ft) long and extending to the stem tips, covered with yellowish woolly hairs 4-6 cm (1.6-2.4 in) long. Flowers tubular to bell shaped, white to pale yellow, aro-
140 Cepbalocereus columna-trajani
matic, to 7.5 cm (3 in) long and in diameter. Distribution: dense forests in Puebla, Mexico.
Cephalocereus nizandensis (Bravo & T. MacDougall) Bux-baum 1965
Neodawsonia nizandensis Bravo &T. MacDougall 1963
Plants erect, unbranched at first but later branching extensively slightly inward, 2-3 m (6.6-9.8 ft) high. Stems cylindrical,bright green, constricted, 12-15 cm (4.7-5.9 in) in diameter. Ribs 25-28, obtuse. Central spines about 6, directed upward, thick, rigid, erect, yellow, to 10 mm (0.4 in) long. Radial spines 16, very slender, flexible, whitish yellow, 15-30 mm (0.6-1.2 in) long. Pseudocephalia apical, with yellowish brown silky hairs and bristles 2-3 cm (0.8-1.2 in) long. Flowers tubular to bell shaped, rose colored, to 4 cm (1.6 in) long; pericarpels with small acuminate, triangular scales and flexible hairs. Distribution: Chiapas, Mexico.
Cephalocereus senilis (Haworth) Pfeiffer 1838
bunny cactus, old man cactus, old man of mexico, viejo, white persian cat cactus
Cactus senilis Haworth 1824, Cereus senilis (Haworth) A. P. de Can-dolle 1828, Piiocereus senilis (Haworth) Lemaire 1839
Plants erect, branching only basally, to 15 m (49 ft) high. Stems light green, becoming gray, to 30 cm (12 in) in diameter. Ribs 20-30, low, slightly notched. Central spines 1-5, stout, yellowish to grayish, 1-5 cm (0.4-2 in) long. Radial spines 20-30, hairlike, white, 6-12 cm (2.4-4.7 in) long. Pseudocephalia on one side of stem at first, later covering entire apical area, with dense, white hairs. Flowers funnel shaped, yellowish pink, 8-9 cm (3.1-3.5 in) long, 7-8 cm (2.8-3.1 in) in diameter; pericarpels and floral tubes hairy with few scales. Fruits obovoid, slightly scaly, 2.5-3 cm (1-1.2 in) long. Distribution: Hidalgo and Guanajuato, Mexico, with one of the most spectacular sites being the valley of Metztitlan.
Cephalocereus totolapensis (Bravo & T. MacDougall) Bux-baum 1965
Neodawsonia totolapensis Bravo &T. MacDougall 1963
Plants erect, unbranched, 3-8 m (9.8-26 ft) high. Stems gray-green, 12-15 cm (4.7-5.9 in) in diameter. Ribs as many as 28 with blunt angles. Central spines 3-6, white with a darker tips, 5-13 mm (0.2-0.5 in) long. Radial spines 10-13, white, 5—13 mm (0.2-0.5 in) long. Pseudocephalia apical, forming rings on the upper stem with intervening annual growth, with long, fine, yellowish, silky hairs to 2.5 cm (1 in) long, often bunching into balls, and some bristly spines to 3
Cephalocereus senilis, also illustrated on page 20
cm (1.2 in) long. Flowers tubular to bell shaped, rose with a yellowish tint, to 3.5 cm (1.4 in) long; pericarpels and floral tubes with small scales and long white hairs. Fruits globose, 2.5-3 cm (1-1.2 in) in diameter, with scales, white wool, and small spines. Distribution: southeastern Oaxaca, Mexico, in tropical deciduous forest.
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