. Carnegie Institution of Washington publication. . FIG. 169.—I >endrucereus nudiflorus. FIG. 170.—Fruit of D. nudiflorus. 19. MACHAEROCEREUS gen. nov. Plants prostrate or low and bushy, often with long horizontal or prostrate stout branches, very spiny throughout; ribs low; areoles large, felted, and spiny; spines numerous, the centrals flattened and dagger-like; flowers diurnal, i at an areole, long, slender, funnelform, the perianth persisting on the fruit; stamens numerous, borne on the narrow elongated throat; ovary and lower part of flower-tube bearing many small scales, these s
. Carnegie Institution of Washington publication. . FIG. 169.—I >endrucereus nudiflorus. FIG. 170.—Fruit of D. nudiflorus. 19. MACHAEROCEREUS gen. nov. Plants prostrate or low and bushy, often with long horizontal or prostrate stout branches, very spiny throughout; ribs low; areoles large, felted, and spiny; spines numerous, the centrals flattened and dagger-like; flowers diurnal, i at an areole, long, slender, funnelform, the perianth persisting on the fruit; stamens numerous, borne on the narrow elongated throat; ovary and lower part of flower-tube bearing many small scales, these subtending felted areoles which afterwards bear clusters of spines; fruit globular, edible when young, covered with clusters of spines, but when fully mature becoming naked; seeds dull black, somewhat punctate, acute on the back. In its fruit this genus is nearest Lemaireocereus, to which we once referred its two species; the perianth, however, is much more elongated and more persistent; in habit and shape of spines the species are very different from any of Lemaireocereus. Two species, natives of Lower California, are recognized, of which Ccrcus cnica Bran- degee is the type. The generic name is from the Greek, signifying dagger-cereus, with reference to the dagger-like spines. KEY TO SPECIES. Prostrate, the tips ascending; flowers yellow i. M. eruca Bushy, erect, i meter high or less; flowers purple 2. M. gummosus. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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