Acanthocereus horridus sp nov

Plants stout, the joints strongly 3-angled or 3-winged, the young growth 5 or 6-angled; wings with deep undulations; areoles large, 3 to 6 cm. apart; spines brown or blackish when young; radial spines 1 to 6, very short, conic, less than 1 cm. long; central spine usually 1, sometimes 2, often very stout and elongated, sometimes 8 cm. long; flower, including the ovary, 18 to 20 cm. long; tube 4 cm. long, including the funnelform throat 12 cm. long; throat 4 cm. broad at mouth; outer perianth-segments linear, brown or greenish, 6 cm. long; inner perianth-segments 3 to 4 cm. long; stamens white; style thick, cream-colored; fruit 3.5 cm. long, light red, glossy, covered with large areoles bearing white felt; skin thick, finally splitting as the fruit ripens; pulp red.

Collected in Guatemala by F. Eichlam in 1909 (New York Botanical Garden No. 34788). It has frequently flowered in cultivation, both at Washington and at New York.

Here we are disposed to refer E. W. Nelson's plant from San Juan Guichicovi, Oaxaca, Mexico, collected June 21 to 24, 1895 (No. 2729).

Figure 181 shows a part of a joint of the type specimen.

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