. Carnegie Institution of Washington publication. LEMAIREOCEREUS. 89 This plant is certainly native in south-central Mexico, and distinguishable from the related cultivated L. grisens by fewer ribs, larger flowers, and ovoid fruit. Cereus roridus (Pfeiffer, Enurn. Cact. 54. 1837) was given as a synonym of Echinocactus pruinosus. Cereus cdulis Weber (Monatsschr. Kakteenk. 10:55. 1900) is another name for this species, never described. Illustrations: Bull. Soc. Acclim. France 52: f. i, as Co cits pruinosus; Bradley, Hist. Succ. PI. ed. 2. pi. 12, as Cereus amcri- canus octangularis ; Monatsschr.
. Carnegie Institution of Washington publication. LEMAIREOCEREUS. 89 This plant is certainly native in south-central Mexico, and distinguishable from the related cultivated L. grisens by fewer ribs, larger flowers, and ovoid fruit. Cereus roridus (Pfeiffer, Enurn. Cact. 54. 1837) was given as a synonym of Echinocactus pruinosus. Cereus cdulis Weber (Monatsschr. Kakteenk. 10:55. 1900) is another name for this species, never described. Illustrations: Bull. Soc. Acclim. France 52: f. i, as Co cits pruinosus; Bradley, Hist. Succ. PI. ed. 2. pi. 12, as Cereus amcri- canus octangularis ; Monatsschr. Kakteenk. 18: 171, in part; 21: 37; U. S. Dept. Agr. Bur. PI. Ind. Bull. 262: pi. 8; pi. 13, f. 2; MacDougal, Bot. N. Amer. Des. pi. 23; Journ. N. Y. Bot. Card. 8: f. 6, all these as Cereus cbiirncns. Figure 130 shows a fruit collected by H. H. Rusby in Oaxaca in Fir,, i^o.— Fruit of Lemaireo- cercus pruinosus. 5. Lemaireocereus (?) longispinus sp. nov. Erect, rather stout, light green, the young growth more or less glaucous; ribs 6, broad at base, somewhat acute, more or less undulate; areoles borne at the tops of the undulations; radial spines about 10, spreading or even reflexed, acicular; central spine elongated, porrcet, flattened above, up to 8 cm. long, gray; flowers and fruit unknown. Collected by F. Eichlam in Guatemala in 1909. Figure 131 is from a photograph of the type specimen in the collection of the New York Botanical Garden. 6. Lemaireocereus eichlamii nom. nov. Cereus laevigatus guatemalensis Eichlam in Weingart, Monatsschr. Kakteenk. 22: 182. guatemalensis Vaupel. 1912. Not C. Cylindric, simple in cultivation, deep green except for narrow glaucous bands showing the commencement of new growth; ribs 8 to 10, rather broad and rounded, with acute intervals between; areoles large, brown-felted at first, soon gray; spines 4 to 6, acicular, nearly porrect, 2 cm. long or less; flower-buds obtuse; flower 6 to 7 cm. long; outer perianth-segments greenish
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