Cereus melanurus Schumann in Martius, Fl. Bras. 42: 200. 1890.
Stems more or less cespitose from fibrous roots, slender, 1 meter long or more, 2 to 2.5 cm. in diameter; ribs 12 to 16, low, only 2 to 3 mm. high; branches 10 to 40 cm. long, often short-jointed, 2 to 2.5 cm. in diameter; areoles approximate, 2 to 5 mm. apart, white-felted when young; spines numerous, very unequal; lower radials about 20, white, bristle-like, 5 to 8 mm. long; upper radial spines and centrals about 15, all brown, stouter than the lower radials and a little longer, except that 1 or sometimes 2 of the centrals are much elongated (3 to 5 cm. long); flower narrow, 5 to 6 cm. long, somewhat enlarged above, appearing in December; flower-tube 4 to 5 cm. in diameter, covered with closely appressed hairs; perianth-segments narrow, erect, acute; seeds 1.5 mm. long, brownish.
Type locality: Serra de S. Joao del Ray, Brazil.
Distribution: Minas Geraes, Brazil.
The above description is drawn from the original of Schumann, supplemented by notes from specimens collected in Minas Geraes, Brazil, by Campos Porto and sent to Washington by Dr. A. Lofgren in 1917. These specimens differ considerably in habit from the plant as originally described, but since they come from near the type locality and have the same ribs and spines we believe we are justified in so referring them.
Illustration: Martius, Fl. Bras. 42: pl. 39, as Cereus melanurus.
Figure 162 is copied from the illustration above cited.
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