Santa Marta Blossomcrown is an attractive hummingbird of the Sierra Nevada de Santa Marta, in northern Colombia; this species formerly was considered to be conspecific with Tolima Blossomcrown (A. berlepschi) of the Andes of south central Colombia. Both species are small hummingbirds with a relatively short, straight bill. Males have green upperparts, with a buffy white forecrown, bright orange hindcrown, and dull gray underparts. Female blossomcrowns are similar to males but are dull brown on the crown. The most striking plumage difference between the species is in the pattern of the rectrices: the tips of the undersurface of the tail feathers are broadly white in Tolima Blossomcrown, but the pale tips are smaller and tawny in the Santa Marta species. Santa Marta Blossomcrown occupies the understory of humid montane forest and older second growth; not common, it is threatened by habitat loss.