Arboretum » Campus Plant Identification – Mead Hall » Mead Hall south side – Aloe dichotoma (Quiver tree), Pachycereus marginatus (Mexican fencepost cactus), Opuntia basilaris (Short beavertail cactus) Mead Hall south side – Aloe dichotoma (Quiver tree), Pachycereus marginatus (Mexican fencepost cactus), Opuntia basilaris (Short beavertail cactus)