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1 December 2007 Taxonomy and conservation of Haageocereus Backeb. (Cactaceae) in Peru
Natalia Calderón, Daniela Zappi, Nigel Taylor, Aldo Ceroni
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The genus Haageocereus (Cactaceae) is almost endemic to Peru, occupying arid areas of river valleys draining westwards off the Andes. Extensive fieldwork, morphological studies, literature revision and a study of the types led to the delimitation of 9 species and 6 heterotypic subspecies. Nomenclatural innovations include H. acranthus subsp. backebergii N. Calderón subsp. nov., H. versicolor subsp. pseudoversicolor (Rauh & Backeb.) N. Calderón comb. nov. and the recognition of H. repens Rauh & Backeb. Descriptions and keys are accompanied by line drawings and plates including SEM photos of the seeds for almost every taxon. Exsiccata prepared during this study constitute approximately 80% of existing Haageocereus herbarium samples from wild origin. Conservation assessments based on the IUCN Red List categories (2001) determined 3 taxa as Critically Endangered (CR), 8 taxa as Endangered (EN) and 5 taxa as Vulnerable (VU) in Peru.

Natalia Calderón, Daniela Zappi, Nigel Taylor, and Aldo Ceroni "Taxonomy and conservation of Haageocereus Backeb. (Cactaceae) in Peru," Bradleya 2007(25), 45-124, (1 December 2007).
Published: 1 December 2007
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