Habitats of members of the Elaeagnifolium clade. A Solanum elaeagnifolium, old stems with persistent berries and young new stems from underground rhizomes (Argentina, Mendoza, Knapp et al. 10470) B Solanum houstonii on rocky slope (Mexico, Querétaro, Ochoterena et al. 976) C Solanum mortonii, plant dug up showing extensive underground stems (Argentina, Catamarca, Barboza et al. 3437) D Solanum mortonii, large population on rocky slopes (Argentina, Catamarca, Barboza et al. 3437). Photographs by S. Knapp