Haseltonia 24

Drosanthemum decumbens (Aizoaceae), a new status for an obligatory cremnophyte from the Western Cape, South Africa
Ernst van Jaarsveld

A putative intercladal Echinopsis s.l. (Cactaceae) hybrid from Andean Chile
Urs Eggli & Mario Giorgetta

Natural history notes for the columnar, globular and semi-epiphytic cactus species of the island of Puerto Rico
Roberto Carrera-Martínez, Jorge Ruiz-Arocho, Laura Aponte-Díaz & David A. Jenkins

Anthropic pressure on the diversity of Cactaceae in a region of Atlantic Forest in Eastern Brazil
Weverson Cavalcante Cardoso, Alice Calvente, Valquíria Ferreira Dutra & Cassia Mônica Sakuragui

Notes on the typification and nomenclature of Agave dissimulans Trelease, Agave convallis Trelease, and Agave kerchovei Lem. (Asparagaceae: Agavoideae / Agavaceae)
Gideon F. Smith, Estrela Figuereido & Greg Starr

The taxonomy of Kalanchoe hirta Harv. and K. crenata (Andrews) Haw. (Crassulaceae), and reinstatement of K. hirta as a distinctive, endemic species from Southern and south-tropical Africa
Gideon F. Smith, Estrela Figueiredo & Neil R. Crouch

A new species of Ceropegia sect. Rhytidocaulon (Apocynaceae) from southern Yemen
Pavel Hanáček & Peter V. Bruyns

Areole changes during bark formation on Saguaro cacti
Lance S. Evans and Ryan L’Abbate

Historical note about rooting succulent leaf cuttings
Root Gorelick

Many cacti have clusters of terminal tracheids on their cortical bundles
James D. Mauseth