Cereus roseiflorus Spegazzini 1925
Plants treelike with several branches, to 5 m (16 ft) high. Stems more or less erect, green. Ribs 6, notched, to 3.5 cm (1.4 in) high. Areoles 2-2.5 cm (0.8-1 in) apart. Spines usually 3, expanded basally, to 1 cm (0.4 in) long. Flowers pink to rose, to 20 cm (7.9 in) long. Fruits ovoid, violet-red, to 7 cm (2.8 in) long. Distribution: Argentina. Cereus roseiflorus is poorly known.
Cereus saddianus (Rizzini & A. Mattos) P. J. Braun 1988 Monvillea saddiana Rizzini & A. Mattos 1985
Plants treelike, erect, 2-6 m (6.6-20 ft) high with distinct trunks. Stems cylindrical, gray-green, to 6.5 cm (2.6 in) in diameter. Ribs 8-9, distinctly wavy, to 15 mm (0.6 in) high. Areoles with white wool, 17-20 mm (0.7-0.8 in) apart. Spines pale yellow with darker bases, needle-like, sharp. Central spine one, 13-25 mm (0.5-1 in) long. Radial spines 5-7, pointing downward, 5-12 mm (0.2-0.5 in) long. Flowers white, 7.5-8 cm (3-3.1 in) long, to 4 cm (1.6 in) in diameter. Fruits ellipsoidal, 4.5-5.5 cm (1.8-2.2 in) long, 2-4 cm (0.81.6 in) in diameter, pulp pinkish. Distribution: Mato Grosso, Brazil.
Cereus Spegazzinii F. A. C. Weber 1899 Piptanthocereus spegazzinii (F. A. C. Weber) Riccobono 1909, Monvillea spegazzinii (F. A. C. Weber) Britton & Rose 1920 Cereus anisitsii K. Schumann 1899, Monvillea anisitsii (K. Schumann) A. Berger 1929
Cereus lindenzweigianus Gürke 1906, Monvillea lindenzweigiana (Gürke) Backeberg 1935, Piptanthocereus lindenzweigianus (Gürke) F. Ritter 1979 ?Cereus ridleii Andrade-Lima ex Backeberg 1960 Monvillea ebenacantha F. Ritter 1980
Plants shrubby, much branched with the stems erect, arching, or nearly prostrate. Stems long cylindrical, blue-green, often marbled with white, to 2 m (6.6 ft) long, 1.5-2 cm (0.6-0.8 in) in diameter. Ribs 3-5, distinctly tuberculate to toothed. Areoles borne at tubercle tips, widely separated. Spines 2-3 at first, later as many as 6, blackish, to 15 mm (0.6 in) long. Flowers white, 10-13 cm (3.9-5.1 in) long, 7-9 cm (2.8-3.5 in) in diameter. Fruits ellipsoidal, pink. Distribution: Brazil, northern Argentina, Bolivia, and Paraguay.
Plants treelike, sparesely to much branched with erect stems, to 8 m (26 ft) high. Stems cylindrical, blue-green, later pale glaucous green, 6-9 cm (2.4-3.5 in) in diameter. Ribs 4-5, very thin, deeply notched, prominent. Areoles borne at the notches, widely separated. Spines 3-4, conical, thick or bulbous basally, diverging, yellow with black tips or black, to 5 mm long. Flowers pink to rose, 20-22 cm (7.9-8.7 in) long. Fruits ovate, red with red pulp, to 10 cm (3.9 in) long. Distribution: Argentina and Paraguay.
Continue reading here: Cereus tacuaralensis Crdenas 1964
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