A new species of Pseudomiltemia (Rubiaceae) of Chiapas, Mexico

Pseudomiltemia davidsonii is described and illustrated as a new endemic species from the Sierra Madre of Chiapas, Mexico. It is a shrub or small tree characterized by having flowers axillary and solitary or in monochasia and with large yellow corollas. Pseudomiltemia davidsonii differs from P. filisepala, the only other species in this genus, by its opposite leaves with longer petioles, inflorescences with shorter peduncles 5-13 mm long, smaller bracts, longer pedicels 6-15 mm long, and narrower fruits 3.5-4.5 mm in diameter.