The poorly understood Weberbauerocereus is of uncertain affinity. It is probably closely related to the Rauhocereus as well as Haageocereus and those species of Echinopsis formerly included in Trichocereus, but Wilhelm Barthlott reported (Hunt and Taylor 1986) that its seeds suggest a relationship to Browningia. Further research clearly is needed.
Curt Backeberg described Weberbauerocereus in 1942, honoring August Weberbauer, who did extensive research in the Peruvian Andes. Backeberg noted that the members of the genus are large shrubs or treelike cacti, whose flowers have S-shaped floral tubes and oblique limbs. The number of species of Weberbauerocereus is uncertain but eight are presently recognized.
Weberbauerocereus Backeberg 1957 Meyenia Backeberg 1931, not Nees 1832 (Acanthaceae)
Subfamily Cactoideae, tribe Trichocereeae. Plants shrubby to treelike, branching basally or above the ground, sometimes forming distinct trunks. Stems columnar, upright or curving, sometimes scrambling. Areoles white to yellowish, woolly. Spines present, often stout. Flowers large, tubulartofunnelform, radially to bilaterally symmetrical, mostly open at night, whitish, brownish, or reddish; pericarpels and floral tubes densely covered with scales and hairs. Fruits small, covered with hairs. Distribution: Peru and northern Chile.
Weberbauerocereus churinensis f. Ritter 1962 Haageocereus churinensis (F. Ritter) P. V. Heath 1995
Plants shrubby, more or less erect, to 2 m (6.6 ft) high, branching basally. Stems cylindrical, to 5 cm (2 in) in diameter. Ribs 18-20, obtuse, weakly notched. Spines 40-60, poorly differentiated as centrals and radials, light orange-yellow, some stout, others hairlike, to 1 cm (0.4 in) long, 1-2 longer, to 3 cm (1.2 in). Flowering zone sometimes evident, with only bristles 2-4 cm (0.8-1.6 in) long. Flowers pink above, white below, strongly fragrant, to 12 cm (4.7 in) long; floral tubes stout, reddish with dark hairs. Fruits with dark hairs, to 4 cm (1.6 in) long and in diameter. Distribution: Lima, Peru.
Weberbauerocereus cuzcoensis Knize 1969 Haageocereus cuzcoensis (Knize) P. V. Heath 1995
Plants much branched, spreading trees, 3-4 m (9.8-13 ft) high. Stems gray-green, 4-7 cm (1.6-2.8 in) in diameter. Ribs 10-14, very obtuse, 6-11 mm (0.2-0.4 in) high. Areoles with white wool, oval to round. Spines yellow to brownish yellow, stout. Central spines 3-8, not sharp, 1-4 cm (0.41.6 in) long. Radial spines 10-14,0.3-1 cm (to 0.4 in) long, the longest ones below. Flowers light green, 10-12 cm (3.9—
4.7 in) long. Fruits green, 4 cm (1.6 in) long, 3 cm (1.2 in) in diameter. Distribution: Andes of central Peru.
Weberbauerocereus johnsonii f. Ritter 1962 Haageocereus johnsonii (F. Ritter) P. V. Heath 1995
Plants shrubby to treelike, branching from 1.5 m (4.9 ft) and above, to 6 m (20 ft) high with short trunks. Stems columnar, usually erect, 7-9 cm (2.8-3.5 in) in diameter. Ribs 30-35, obtuse, somewhat tuberculate, to 5 mm high. Areoles brown. Spines not clearly differentiated as centrals and radials, fine, golden yellow, scarcely sharp. Central spines 10-12, stout, flexible,to 1 cm (0.4 in) long. Radial spines asmanyas20ormore, to 1.5 cm (0.6 in) long. Flowering zone somewhat distinguishable, with larger areoles and hairlike bristles to 6 cm (2.4 in) long. Flowers white or pale pinkish white, to 11 cm (4.3 in) long; floral tubes with brownish black wool and stout reddish brown hairs. Fruits globose, green, to 4 cm (1.6 in) in diameter, with gray and brown hairs. Distribution: Cajamarca, Peru.
Weberbauerocereus longicomus f. Ritter 1962 Haageocereus longicomus (F. Ritter) P. V. Heath 1995 Weberbauerocereus albus F. Ritter 1962, Haageocereus albus (F. Ritter) P. V. Heath 1995
Plants treelike, branching in the lower third, to 6 m (20 ft) high. Stems straight, mostly erect, fairly closely spaced, gray-green, to 8 cm (3.1 in) in diameter. Ribs 15-18, very obtuse, to 10 mm (0.4 in) high. Areoles brown. Central spines 1-2,
Weberbauerocereus rauhii, photograph by Werner Rauh very stout, awl shaped, pale brownish yellow, 0.5-1 cm (0.2-0.4 in) long. Radial spines 15-25, pale to brownish yellow, to 1 cm (0.4 in) long, lower ones finer. Flowering zone somewhat distinct, with a transitional area of modified spines, becoming one of dense hairs to 10 cm (3.9 in) long. Flowers somewhat fragrant, white to pink; floral tubes reddish brown, with tufted wool and hairs. Fruits globose, greenish to reddish, with dense covering of wool, to 3 cm (1.2 in) in diameter. Distribution: Cajamarca, Peru.
Weberbauerocereus rauhii Backeberg 1957 Haageocereus rauhii (Backeberg) P. V. Heath 1995
Plants shrubby to treelike and candelabra-like with short trunks, to 6 m (20 ft) high. Stems vertical, 8-15 cm (3.1-5.9 in) in diameter. Ribs about 23. Areoles gray. Central spines as many as 6, very stout, yellow with darker tips, 6-7 cm (2.42.8 in) long. Radial spines numerous, whitish gray, to 1 cm (0.4 in) long. Flowering zone with long bristles. Flowers creamy brown, to 10 cm (3.9 in) long; floral tubes densely scaly, violet-brown. Fruits brownish red, to 3 cm (1.2 in) in diameter, covered with white wool. Distribution: southern Peru, at an elevation of about 2000 m (6600 ft).
Weberbauerocereus torataensis F. Ritter 1981 Haageocereus torataensis (F. Ritter) P. V. Heath 1995
Plants shrubby, 2-3 m (6.6-9.8 ft) high, spreading. Stems gray-green, 5-8 cm (2-3.1 in) in diameter. Ribs 11-15,8 mm (0.3 in) high, very thick, obtuse. Areoles orangish brown, round to somewhat elongate. Spines reddish brown, not readily distinguishable as centrals and radials. Central spines 4-8,0.7-5 cm (0.3-2 in) long. Radial spines 10-14, needlelike, 0.4-1 cm (to 0.4 in) long. Flowers white to reddish, 9-10 cm (3.5-3.9 in) long; floral tubes reddish brown with small green scales and reddish wool. Fruits barrel shaped, orange. Distribution: Torata, Moquegua, Peru, at an elevation of about 2000 m (6600 ft).
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