Arboretum » Campus Plant Identification – Avery Hall and Benson Auditorium » Front of Benson Auditorium, south side Front of Benson Auditorium, south side Echveria ‘Etna’, Euphorbia milii (Yellow Crown of thorns), Echeveria ‘Mauna Loa’, Senecio haworthii (Wooly senecio), Aloe stricta, Echeveria agavoides X E. lindsayana, Dudleya brittonii (Giant Chalk Dudleya)