. Carnegie Institution of Washington publication. 122 THE CACTACKAi:. A. horridits A. colombianns A. pentagonus A. subinermis A. occidental is A. brastiiensis A. albicanlis Curiously enough, the type species is one of the species of Linnaeus which Miller omits in his Gardener's Dictionary (1768). < 'ereus /v//;<< / I'fciffcr (Knuni. Cact. 108. 1837), which we formerly referred to this -rims (Contr. U. S. Nat. Herb. 12: 432), following previous authors, is to be looked for in /*c[>Uiccrci(s. Both Schumann and Bergcr regard this group as consisting of but a single species, the former
. Carnegie Institution of Washington publication. 122 THE CACTACKAi:. A. horridits A. colombianns A. pentagonus A. subinermis A. occidental is A. brastiiensis A. albicanlis Curiously enough, the type species is one of the species of Linnaeus which Miller omits in his Gardener's Dictionary (1768). < 'ereus /v//;<< / I'fciffcr (Knuni. Cact. 108. 1837), which we formerly referred to this -rims (Contr. U. S. Nat. Herb. 12: 432), following previous authors, is to be looked for in /*c[>Uiccrci(s. Both Schumann and Bergcr regard this group as consisting of but a single species, the former placing it with ( greggii in his series Acutangules, and the latter in a subsection Acanthocereus; Pfeiffer, on the other hand, recognized several species as belonging to this group; we distinguish at least 7. The name is from the Greek, meaning thorn-cereus. KEY TO SPECIES. Ribs usually 3, rarely 4, thick. Joints 8 to 10 cm. wide, dee'ply crenate; spines very stout, subulate. Spines i to 6; perianth-tube about 7 cm. long i. Spines about 10, the outer 5 to 8, very short; perianth-tube about 12 cm. long 2. Joints 2 to 8 cm. wide, low-crenate; spines slender. Spines well developed, subulate 3. Spines short or none, when present acicular 4. Ribs 4 to 7, mostly thin. Plants green. Spines up to 7 cm. long; ribs 3 to 5 5. Spines 3 cm. long or less; ribs 5 to 7 6. Plants bluish white; joints 4-angled; spines 2 to 6, the longest 2 cm. long 7. 1. 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 i to 6, very short, conic, less than i cm. long; central spine usually i, 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 line
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