CSSA VOL.93, Spring 2021, No.1 The Gympsum Cactus, Pediocactus sileri Rob Skillin Dan's Hill Tim S. Harvey CSSA Seed Depot listing 2021 Sue Haffner Cacti grow smaller in cold climates and larger in warm ones Root Gorelick Operculicarya monoecy Duke Benadom Night Photography in Joshua Tree National Park Vicky & Jim Ramakka Anthrocereus rondonianus hybrids Marc Beckstrom, Byron Fan & Elton Roberts Molecular study of the genus Copiapoa (Cactaceae), Part VII Fred Kattermann

On the cover: A seedling of Pediocactus sileri demonstrating strong growth of radial spines. The current season's growth is a fiery red, fading to black. The previous years' growth is light grey. Development of centrals will occur later on new tubercles as the plant matures. The plant pictured is about 1.25 inches in diameter. Pediocactus sileri is popularly known as the Gypsum Cactus, due to its preference for growing on substrates containing gypsum. Rob Skillin shows many other habitat examples in this issue's article on The Gypsum Cactus.