Arthrocereus rondonianus Backeberg Voll 1935

Plants somewhat erect. Stems slender, light green, to 50 cm (20 in) long and 2.5 cm (1 in) in diameter. Ribs 14-18, low, rounded. Spines greenish yellow to golden yellow. Central spines 1-2, to 7 cm (2.8 in) long. Radial spines 40-50, fine, needle-like, to 0.5 cm long with a few to 2 cm (0.8 in) long. Flowers lilac-pink, to 8 cm (3.1 in) long. Distribution: Minas Gerais, Brazil.

Arthrocereus spinosissimus (Buining & Brederoo) F. Ritter 1979

Eriocereus spinosissimus Buining & Brederoo 1977

Plants erect, branching basally. Stems green to bright green, to 1 m (3.3 ft) long, 5-6 cm (2-2.4 in) in diameter. Ribs 16 or more, 4-5 mm high. Areoles close set. Spines many, thin, yellowish. Central spines 6-8,2-2.8 cm (0.8-1.1 in) long with some to 4.5 cm (1.8 in) long. Radial spines about 20,0.7-0.8 cm (0.3 in) long. Flowers white, 6-7 cm (2.4-2.8 in) long. Fruits 2.5-3 cm (1-1.2 in) long. Distribution: Mato Grosso, Brazil. Arthrocereus spinosissimus is a species of uncertain status.

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