Key to Subspecies of Palicourea sessilis
1. Calyx limb shortly dentate, lobed for less than 1/2 its length; plants of Brazil and Paraguay.....Palicourea sessilis subsp. sessilis
1'. Calyx limb lobed rather deeply, for about 1/2 its length; plants of Guayana and Venezuela....Palicourea sessilis subsp. sororopanensis