Haseltonia 26

Cotyledon tanquana, a new species from the Tanqua Karoo region, Western Cape, South Africa Ernst J. van Jaarsveld  Areole changes during bark formation for columnar cactus species Lance S. Evans and Catherine A. McDonough  Morphological and molecular diagnostic characters reveal a new species of Pachyphytum (Crassulaceae) Jerónimo Reyes Santiago, Luis E. De La Cruz-López, Maria Kuzmina, and Francisco Vergara-Silva  Further records of cacti (Cactaceae) from Tarragona province (Catalonia), Spain Filip Verloove and Alessandro Guiggi  Aloiampelos ciliaris nothovar. gigas (Asphodelaceae subfam. Alooideae), a new status for Aloe ciliaris f. gigas Gideon F. Smith and Estrela Figuiredo   The use of herbicides in South American dry forests to control shrub encroachment: a new threat to cactus species? A first assessment Diego E. Gurvich   Notes on five nothospecies published by or in honour of Flávio Resende in the mid- 1900s in Haworthia, now Haworthiopsis (Asphodelaceae subfam. Al