Synonyms: Declieuxia alba; Declieuxia alfredii; Declieuxia anceps; Declieuxia brevicollis; Declieuxia cacuminis mexicana; Declieuxia cacuminis var. mexicana; Declieuxia calophylla; Declieuxia chiococcoides; Declieuxia chiococcoides mexicana; Declieuxia chiococcoides var. genuina; Declieuxia chiococcoides var. guyanensis; Declieuxia chiococcoides var. hirta; Declieuxia chiococcoides var. linearis; Declieuxia chiococcoides var. lucida; Declieuxia chiococcoides var. mexicana; Declieuxia chiococcoides var. opaca; Declieuxia chiococcoides var. pallida; Declieuxia chiococcoides var. papillosa; Declieuxia chiococcoides var. puberula; Declieuxia chiococcoides var. puberulina; Declieuxia chiococcoides var. vincoides; Declieuxia clinopodioides; Declieuxia foliosa (homotypic); Declieuxia fruticosa var. guyanensis; Declieuxia fruticosa var. mexicana; Declieuxia glabra (homotypic); Declieuxia glauca (homotypic); Declieuxia mexicana; Declieuxia mollis; Declieuxia mucronulata (homotypic); Declieuxia origanoides; Declieuxia pulverulenta (homotypic); Declieuxia revoluta; Declieuxia rubioides; Declieuxia vincoides; Houstonia fruticosa (heterotypic); Psyllocarpus foliosus; Psyllocarpus glaber; Psyllocarpus trichotomus