Echinofossulocactus zacatecasensis sp nov

Plants solitary, globular, 8 to 10 cm. in diameter; ribs pale green; very thin, about 55; radial spines 10 to 12, spreading, acicular, white, 8 to 10 mm. long; central spines 3, brownish, 2 of them terete, but the middle one flattened, erect or connivent, longer than the other 2, sometimes 3 to 4 cm. long, never annulate; flowers 3 to 4 cm. broad, nearly white; inner perianth-segments linear-oblong, with an ovate apiculate tip, slightly tinged with lavender, 15 mm. long; style slender; stigma-lobes bifid(!); scales on the ovary broadly ovate, apiculate, scarious.

Collected by F. E. Lloyd in northern Zacatecas, Mexico, in 1908 (No. 58). Living specimens were sent to Washington and these flowered in March 1909.

Cactus Mexico
Fig. 119.—Echinofossulocactus zacatecascensis. Fig. 120.—Echinofossulocactus arrigens.

This species is perhaps nearest E. multicostatus, but has fewer ribs and fewer radial spines.

Continue reading here: Figure 119 is from a photograph of the type plant 9 Echinofossulocactus lamellosus Dietrich

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