Cereus tacuaralensis Crdenas 1964
Plants treelike, tall columnar, with some branches, to 5 m (16 ft) high. Stems cylindrical, segmented, to 12 cm (4.7 in) in diameter. Ribs 4, acute, 4-5 cm (1.6-2 in) high. Areoles round, widely separated, gray. Spines pale brown, awl shaped. Central spines 2, directed downward, 3-6 cm (1.2-2.4 in) long. Radial spines 4,1.5-3.5 cm (0.6-1.4 in) long. Flowers white with reddish tips, 8-10 cm (3.1-3.9 in) long. Fruits ovoid, dark purple with white pulp, to 8 cm (3.1 in) long. Distribution: Chiquitos province, Santa Cruz, Bolivia.
150 Cere us trigonodendron
Cereus trigonodendron K. Schumann exVaupel 1908
Plants treelike, to 15 m (49 ft) high with a few erect branches and with trunks. Stems cylindrical. Ribs 3. Central spine one, to 6 mm (0.2 in) long. Radial spines 6. Flowers red. Distribution: northeastern Peru. There is serious question about the nature of Cereus trigonodendron or whether it is, indeed, a Cereus. Further study is needed.
Cereus validus Haworth 1831 Piptanthocereus validus (Haworth) Riccobono 1909 Cereus forbesii Otto 1846, Piptanthocereus forbesii (Otto) Riccobono 1909
Plants shrubby, with some branches, to 2 m (6.6 ft) or more high. Stems cylindrical, blue-green at first, later pale green, glaucous, 5-8 cm (2-3.1 in) in diameter. Ribs 4-8, obtuse, compressed. Areoles small, gray. Central spine usually one, sometimes 2-3, stout, yellowish brown, to 16 cm (6.3 in) long. Radial spines 5, short, stout, yellowish to gray, to 2 cm (0.8 in) long. Flowers white to reddish. Fruits red with red pulp. Distribution: eastern Bolivia and Argentina.
Continue reading here: Cereus vargasianus Crdenas 1951
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