Espostoopsis (type, Cereus dybowskii = E. dybowskii) was described in 1968 by Franz Buxbaum, who believed that the single species differs sufficientiy from either Austrocephalo-cereus (= Micranthocereus) or Cephalocereus, into which it had been placed by other researchers. Friedrich Ritter, apparently unaware of Buxbaum's new genus, later in the same year described Gerocephalus to include C. dybowskii. The name Espostoopsis is derived from the Greek opsis, resemblance, thus Espostoa-like. Buxbaum placed Espostoopsis in the tribe Trichocereeae, which the International Cactaceae Systematics Group has followed after considerable debate and some uncertainty.

Espostoopsis is a low shrub, branching at the base to produce several erect stems covered by white hairs. The stems produce lateral cephalia from which arise short, tubular to bell-shaped, white flowers that are open at night during summer. Fruits are pale pink and indehiscent.

Espostoopsis Buxbaum 1968 Austrocephalocereus Backeberg 1938, confusing name Gerocephalus F. Ritter 1968

Subfamily Cactoideae, tribe Trichocereeae.

Espostoopsis dybowskii (Roland-Gosselin) Buxbaum 1968 CABEGA

Cereus dybowskii Roland-Gosselin 1908, Cephalocereus dybowskii (Roland-Gosselin) Britton & Rose 1920, Austrocephalocereus dybowskii (Roland-Gosselin) Backeberg 1951, Gerocephalus dybowskii (Roland-Gosselin) F. Ritter 1968, Coleocephalocereus dy-bowskii (Roland-Gosselin) F. H. Brandt 1981

Plants shrubby, mostly branching basally, producing several erect, unbranched stems, 2-4 m (6.6-13 ft) high. Stems cylindrical, to 8 cm (3.1 in) in diameter, with white hairs completely obscuring them. Ribs 20-28, low. Areoles with matted yellowish wool and abundant white hairs. Central spines 2-3, yellow, erect, needle-like, 2-3 cm (0.8-1.2 in) long. Radial spines numerous, short, fine, hidden in the are-

322 Espostoopsis dybowskii olar hairs. Cephalia produced laterally, to 60 cm (24 in) long, consisting of masses of long white wool. Flowers open at night, short tubular to bell shaped, white, to 4 cm (1.6 in) long; pericarpels naked; floral tubes with very small scales, otherwise naked. Fruits broadly ovoid, nearly naked, pale pink with white pulp, indehiscent, 2.5 cm (1 in) in diameter; floral remains persistent and becoming black. Seeds black, oval to pear shaped, rough, tuberculate. Distribution: northern Bahia, Brazil.

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