Lemaireocereus pruinosus Otto

Echinocactuspruinosus Otto in Pfeiffer, Enum. Cact. 54. 1837.

Cactus pruinosus Monville in Steudel, Nom. ed. 2. 1: 246. 1840.

Cereus pruinosus Otto in Förster, Handb. Cact. 398. 1846.

Cereus laevigatus Salm-Dyck, Cact. Hort. Dyck. 1849. 204. 1850.

Plant usually tall, with a more or less definite trunk; ribs 5 or 6, very high, separated by broad intervals; spines few, the radial ones 5 to 7, brownish; central spine solitary, 3 cm. long; flowering areoles large, brown-felted; flowers about 9 cm. long; upper scales and outer perianth-segments 1 cm. long or less, rounded at apex; inner perianth-segments longer and thinner than the outer ones. ovary with numerous brown-felted areoles; fruit ovoid, spiny, 6 to 7 cm. long.

Type locality: Mexico.

Distribution: South-central Mexico.

Fig. 129.—Lemaireocereus griseus.

This plant is certainly native in south-central Mexico, and distinguishable from the related cultivated L. griseus by fewer ribs, larger flowers, and ovoid fruit.

Cereus roridus (Pfeiffer, Enum. Cact. 54. 1837) was given as a synonym of Echinocactus pruinosus.

Cereus edulis Weber (Monatsschr. Kakteenk. 10: 55. 1900) is another name for this species, never described.

Illustrations: Bull. Soc. Acclim. France 52: f. 1, as Cereus pruinosus; Bradley, Hist. Succ. Pl. ed. 2. pl. 12, as Cereus ameri-canus octangularis; Monatsschr. Kakteenk. 18: 171, in part; 21: 37; U. S. Dept. Agr. Bur. Pl. Ind. Bull. 262: pl. 8; pl. 13, f. 2; MacDougal, Bot. N. Amer. Des. pl. 23; Journ. N. V. Bot. Gard. 8: f. 6, all these as Cereus eburneus.

Figure 130 shows a fruit collected by H. H. Rusby in Oaxaca in 1910.

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; areole borne at the tops of the undulations; radial spines about 10, spreading or even reflexed, acicular; central spine elongated, porrect, 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.

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