Espostoa frutescens J E Madsen 1989

Plants shrubs, branching basally, without trunks, to 2 m (6.6 ft) high. Stems erect, 0.5-2 m (1.6-6.6 ft) long, 6-10 cm (2.4-3.9 in) in diameter. Ribs 22-28, low, rounded. Areoles elliptical, 5-7 mm (0.2-0.3 in) apart, with hairs, spines, and light brown wool. Spines as many as 40 or more, pale yellow, needle-like, round, spreading, 4-8 mm (to 0.3 in) long; single central spine sometimes present, 10-25 mm (0.4-1 in) long. Lateral cephalia 20-50 cm (7.9-20 in) long, 5-7 ribs wide, with light brown wool to 30 mm (1.2 in) long. Flowers funnelform, white, 4-4.5 cm (1.6-1.8 in) long, 3.5-4 cm (1.4-1.6 in) in diameter. Fruits top shaped, green, 1.6-2 cm (0.6-0.8 in) long, 1.5-2.5 cm (0.6-1 in) in diameter. Distribution: Azuay, Ecuador.

Espostoa guentheri (Kupper) Buxbaum 1959 Cephalocereus guentheri Kupper 1931, Vatricania guentheri (Kupper) Backeberg 1950

Plants shrubby, branching basally, to 2 m (6.6 ft) high. Stems erect, light green, to 10 cm (3.9 in) in diameter. Ribs about 27, weakly tuberculate. Areoles 1 cm (0.4 in) apart, with short yellowish white wool. Spines about 15, dark yellow, 0.5-2.2 cm (0.2—0.9 in) long. Lateral cephalia to 50 cm (20 in) long, with reddish brown to gray wool and many spines 4-6 cm (1.6-2.4 in) long. Flowers bell shaped to tubular, yellowish white, 8 cm (3.1 in) long, 2.5-3 cm (1-1.2 in) in diameter; pericarpels and floral tubes with fine pinkish wool. Fruits scaly. Distribution: Bolivia.

Espostoa huanucoensis H. Johnson ex F. Ritter 1981

Plants shrubby, branching above the ground, 2-3 m (6.6-9.8 ft) high. Stems diverging, green, 6-10 cm (2.4-3.9 in) in diameter. Ribs 17-25,5-7 mm (0.2-0.3 in) high. Areoles with yellowish brown felt. Spines 30-40, bright golden yellow, needle-like, 0.5-1 cm (0.2-0.4 in) long. Lateral cephalia covering 5-8 ribs, 1-2 m (3.3-6.6 ft) long, with white hairs 5-7 cm (2-2.8 in) long. Flowers white, 5.5-7 cm (2.2-2.8 in) long. Fruits green or reddish brown, 2-3.5 cm (0.8-1.4 in) long. Distribution: Huanuco, Peru. Espostoa huanucoensis maybe merely a variant of E. lanata.

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