Plants globose, solitary, barely rising above ground level, green, to 5 cm (2 in) in diameter. Ribs 10-15, barely distinguishable, forming large nipple-like tubercles. Spines 3-10, pectinate, white to dark yellow, 1-15 mm (to 0.6 in) long. Single central spine sometimes present, 2-4 mm long, 1 mm
Pygmaeocereus famüiaris 597
Pygmaeocereusfam iliaris in diameter. Flowers broadly funnelform, white, 6-7 cm (2.4-2.8 in) long, 4.5-6 cm (1.8-2.4 in) in diameter; floral tubes long, slender. Fruits greenish red to brownish, 6-10 mm (0.2-0.4 in) long. Distribution: reported to be from northwest of Huaraz, Ancash, Peru, an area investigated thoroughly and not the likely habitat. There is serious doubt about the accuracy of the author's claim.
Pygmaeocereus bylesianus Andreae & Backeberg 1957 Arthrocereus bylesianus (Andreae & Backeberg) Buxbaum 1972 ?Pygmaeocereus akersii H. Johnson ex Backeberg 1957, not validly published
Pygmaeocereus rowleyanus Backeberg 1962, Arthrocereus row-leyanus (Backeberg) Buxbaum 1969
Plants globose to short cylindrical, branching basally to form small clumps. Taproots fleshy. Stems dark green, to 8 cm (3.1 in) long and 2 cm (0.8 in) in diameter. Ribs 12-14, notched at first, then forming distinct tubercles. Spines numerous, dark, becoming gray with age, radiating, 4-5 mm long. Flowers wide funnelform, white, to 6 cm (2.4 in) long; floral tubes very slender, long. Fruits not known. Distribution: southern Peru.
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