. Carnegie Institution of Washington publication. DENMOZA. 79 rather narrow flowers and exserted stamens there are suggestions of Cleistocactus, but the plant body is very different. It is more like some species of Echinopsis, to which, however, its flowers show little resemblance. It has no close relationship to Cereus or Cephalocereus. Denmoza differs from all other genera in this subtribe in producing long bristle-like spines from the flowering areoles of very old plants. 1. Denmoza rhodacantha (Salm-Dyck). Echinocactus rhodacanthus Salm-Dyck, Hort. Dyck. 341. 1834. Echinopsis rhodacantha S
. Carnegie Institution of Washington publication. DENMOZA. 79 rather narrow flowers and exserted stamens there are suggestions of Cleistocactus, but the plant body is very different. It is more like some species of Echinopsis, to which, however, its flowers show little resemblance. It has no close relationship to Cereus or Cephalocereus. Denmoza differs from all other genera in this subtribe in producing long bristle-like spines from the flowering areoles of very old plants. 1. Denmoza rhodacantha (Salm-Dyck). Echinocactus rhodacanthus Salm-Dyck, Hort. Dyck. 341. 1834. Echinopsis rhodacantha Salm-Dyck, Cact. Hort. Dyck. 1849. 39. 1850. Cleistocactus rhodacanthtis Lemaire, Illustr. Hort. 8: Misc. 35. 1861. Pilocereus erythrocephalus Schumann, Gesamtb. Kakteen 195. 1897. Cereus erythrocephalus Berger, Rep. Mo. Bot. Gard. 16: 69. 1905. Pilocereus rhodacanthus Spegazzini, Anal. Mus. Nac. Buenos Aires III. 4: 485. i9°5- Simple, at first globular, often 3 to 6 dm. long, but becoming elongated, and when of great age meters high and 3 dm. in diameter; ribs 15 to 20 or even 30, broad at base, separated by narrow intervals, about 1 em. high; young areoles felted, circular, when old 8 to 10 mm. in diameter, usually 1 to 2 cm. apart, but on very old plants approximate, perhaps confluent; spines very different on young and very old plants; spines on small plants 6 to 12 at each areole, white or reddish, subulate, more or less curved, 4 cm. long or less; central spine, if present, solitary; spines on the top of old plants slender and longer, 7 cm. long, often accompanied by a row of 10 or more long brown bristles; flowers slender, 4 to 5 cm. long; ovary and flower-tube bear- ing small, triangular to lanceolate, appressed, acute scales with long white hairs in their axils; perianth-segments small, apparently connivent; filaments red, exserted for at least 1 cm. beyond the tube; style red, exserted; wool at base of throat matted, 6 to 8 mm. long; fruit 2 cm. in diameter, nearl
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