A new species of (Compositae, Heliantheae, Enceliinae) from the southern Baja California Peninsula.

Here, we describe and illustrate , a new species of Compositae from the Baja California Peninsula. It is rare and known only from the rocky hills around Puerto Balandra and Pichilingüe, inside the bay of La Paz, in the State of Baja California Sur, Mexico. We determine that this new species has affinities with , based on its suffruticose woody habit, neuter ray florets and compressed disc cypselae with a cleft apex. The taxonomic placement within is supported by nuclear ribosomal sequence data from two regions, ITS and ETS. We also present detailed photographs, a conservation assessment and a dichotomous key to the of the southern Baja California Peninsula. Finally, we discuss the uniqueness of amongst peninsular and its potential significance for understanding the enigmatic biogeography of this ecologically important genus.