Epidendrum petacaense, a new species of Orchidaceae from Sinaloa, Mexico

A new, unusual species of the Epidendrum anisatum group, Epidendrum petacaense is described from the extreme northern range of this genus, and is illustrated in full color, and compared with some of the closely related species: E. anisatum, E. vandifolium, and E. lowilliamsii. Photographs in parallel are presented for the four species in a figure to facilitate comparisons. With other recent discoveries, the total count for the genus Epidendrum is 127 species and two natural hybrids in Mexico.