Plants were obtained in the field, from a site in the Department of Lima,
Province Can˜ ete, in the Mala river basin,above the town of Calango
(12u31917.540S, 76u3091.110W), at near 400 m elevation (Fig. 1A–B; Fig. 2),
where climate conditions are hyper-arid (Rundel et al., 2007).