Arboretum » Campus Plant Identification – Holden Garden » Holden Garden – Cleistocactus roezlii, Dyckia Hybrid, Trichocereus hybrids (Torch cacti), Gasteria acinacifolia (Ox tongue), Parodia schumannianus Holden Garden – Cleistocactus roezlii, Dyckia Hybrid, Trichocereus hybrids (Torch cacti), Gasteria acinacifolia (Ox tongue), Parodia schumannianus