Many of the Peruvian cacti are poorly known, and several appear similar to Haageocereus, one of the better known genera. In 1966 Friedrich Ritter described Lasiocereus (type, L. rupi-cola) to include two species, neither of which had been previously described. The name is derived from the Greek lasios, woolly, thus woolly cereus. The International Cactaceae Sys-tematics Group has been unsure of the status of this genus, at first simply sinking it into Haageocereus (Hunt and Taylor 1986, 1990). However, further discussions led to the conclusion that Lasiocereus, being poorly understood, should be "provisionally recognized" (Hunt 1997b). It is an "accepted genus" in the second edition of the cites Cactaceae Checklist (Hunt 1999a). Lasiocereus comprises two species of shrubby to treelike, very spiny plants that produce pseudocephalium-like structures. Flowers are tubular, white, and densely covered with wool and bristles.

Lasiocereus F. Ritter 1966

Subfamily Cactoideae, tribe Trichocereeae. Plants shrubby to tree like, to 1 m (3.3 ft) high. Stems round in cross section, spiny. Ribs fairly numerous, thin, tuberculate. Areoles numerous. Central spines awl shaped to needle-like, erect. Radial spines numerous, needlelike, erect. Flowers borne near the stem tips from enlarged areoles, creating a cephalium-like appearance, open at night, tubular, white; floral tubes short and wide; pericarpels and floral tubes covered with dense wool and bristles. Fruits barrel shaped, dehiscing basally, pulp dry. Seeds small, tuberculate. Distribution: Peru.

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