. Carnegie Institution of Washington publication. n6 Till- CACTACKAK. preference for soft parts of the coastal plain and grow usually in groups, often topping a slight i-minriuv formed of wind-drifted imiterial. These cactuses serving as a sand hinder and preventing n-osion tend to favor further accumulations. The desert foxes (Vulpcs macrolls devius) of the region tind congenial burrowing places among the procumbent ; Illustrations: Monatsschr. Kakteenk. 5:71; Proc. Calif. Acad. II. 2: pi. 7; .Schumann, Gesanitb. Kakteen f. 29; Nat. Geogr. Mag. 22: 466, as Cereus cruai; Contr. U.
. Carnegie Institution of Washington publication. n6 Till- CACTACKAK. preference for soft parts of the coastal plain and grow usually in groups, often topping a slight i-minriuv formed of wind-drifted imiterial. These cactuses serving as a sand hinder and preventing n-osion tend to favor further accumulations. The desert foxes (Vulpcs macrolls devius) of the region tind congenial burrowing places among the procumbent ; Illustrations: Monatsschr. Kakteenk. 5:71; Proc. Calif. Acad. II. 2: pi. 7; .Schumann, Gesanitb. Kakteen f. 29; Nat. Geogr. Mag. 22: 466, as Cereus cruai; Contr. U. S. Nat. Herb. i6:pl. 127, as Lemaireocereus eruca. Figure 171 is from a photograph taken by E. A. Goldman at vSanto Domingo, Lower California; figure 172 is from a photograph of a plant collected by C. R. Orcutt at Magda- tcria Bay, Lower California. \. Fro. i 72.—Machaerocereus'eruca. 2. Machaerocereus gummosus (Engelmann). 1889. Cereus gummosus Engelmann in Brandcgce. Proc. Calif. Acad. II. 2: 162. Cereus ctimengei Wcbcr, Bull. Mus. Hist. Nat. Paris 1:317. 1895. Cereus flextwsus Engelmann in Coulter. Contr. U. S. Nat. Herb. 3: 411. 1896. Lemaireocereus cumengei Britton and Rose, Contr. U. S. Nat. Herb. 12:424. 1909. Lemaireocereus gtimmosits Britton and Rose, Contr. U. S. Nat. 12: 425. 1909. Erect or ascending, but usually not a meter high, or with long, spreading, sometimes prostrate, branches, the whole plant sometimes having a spread of 6 to 7 meters; branches 4 to 6 cm. in diameter; ribs usually 8, rarely 9, low and obtuse; areoles rather large, about 2 cm. apart; spines stout, the radials 8 to 12, somewhat unequal, about i cm. long; central spines 3 to 6, stout, flattened, one much longer than the others and about 4 cm. long; flowers 10 to 14 cm. long, the tube long and slender; inner perianth-segments 2 to cm. long, purple; stamens about as long as the segments; fruit sub- globose, 6 to 8 cm. in diameter, spiny; skin of fruit bright scarlet; pulp purple; seeds rug
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