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. Alooideae) 
Gideon F. Smith and Vasco Silva  

The identity and taxonomy of ×Sedeveria ‘Blue Mist’ (Mottram) Gideon F.Sm. & Bischofb. (Crassulaceae) 
Gideon F. Smith & Margrit Bischofberger  

Espostoa (Vatricania) guentheri have unusual cephalia or pseudocephalia
Root Gorelick  

New succulents for the Tunisian and North African alien flora 
Ridha El Mokni, Ameur Elaissi and Filip Verloove  

Notes on Kalanchoe ×houghtonii (Crassulaceae subfam. Kalanchooideae), an early hybrid between two species of K. subg. Bryophyllum 
Gideon F. Smith  

Some cacti produce “reaction cortex” rather than reaction wood in curved sections of weight-stressed shoots 
James D. Mauseth