. Carnegie Institution of Washington publication. . FIG. 174.—Machaerocereus gummnsus. FIG. 175.—Flower of M. guimno- sus. Cercns giimmatus, C. gumminosus, and C. pfersdorffii Hildmann (Schumann, Gesamtb. Kakteen 125. 1897) are only garden names of this species. Illustrations: Grassner, Haupt-Verz. Kakteen 3; Monatsschr. Kakteenk. 13: 105, both as Ccrcus gummosus; Contr. U. S. Nat. Herb. 16: pi. 126 A, as Lcnuiircoccreus gummosus. Figure 173 is from a photograph of a plant collected by Dr. Rose at Santa Maria Bay in 1911; figure 174 is from a photograph taken by E. A. Goldman on Esperito
. Carnegie Institution of Washington publication. . FIG. 174.—Machaerocereus gummnsus. FIG. 175.—Flower of M. guimno- sus. Cercns giimmatus, C. gumminosus, and C. pfersdorffii Hildmann (Schumann, Gesamtb. Kakteen 125. 1897) are only garden names of this species. Illustrations: Grassner, Haupt-Verz. Kakteen 3; Monatsschr. Kakteenk. 13: 105, both as Ccrcus gummosus; Contr. U. S. Nat. Herb. 16: pi. 126 A, as Lcnuiircoccreus gummosus. Figure 173 is from a photograph of a plant collected by Dr. Rose at Santa Maria Bay in 1911; figure 174 is from a photograph taken by E. A. Goldman on Esperito Santo Island, Lower California, in 1906; figure 175 shows a flower drawn from an herbarium specimen obtained from C. R. Orcutt, collected in northern Lower California. 20. NYCTOCEREUS (Berger) Britton and Rose, Contr. U. S. Nat. Herb. 12: 423. 1909. Krect or clambering, slender, sparingly branched cacti, with cylindric, ribbed stems and branches; ribs numerous, low; areoles each bearing a tuft of short white wool and small radiating acicular bristles or weak spines; flowers large, white, nocturnal; ovary bearing small scales, short or long wool, and tufts of weak spines or bristles; perianth funnelform, gradually expanding above, bearing scales and tufts of weak bristles below the middle, above the middle bearing narrowly lanceolate scales distant from each other and grading into the blunt outer perianth-segments; inner perianth-segments widely spreading, obtuse or acutish; stamens numerous, shorter than the perianth; style about as long as the stamens; fruit fleshy, scaly, spiny or bristly; seeds large, black. Type species: Cereus serpentinus De Candolle. Nyctocereus was considered by A. Berger a subsection of his subgenus Euccrcus but his conception of it was of a complex, from which we would exclude all but three of the species which he referred to it. He speaks of certain forms in the type species which have smaller flowers and no fruit; this variation we have also not
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