Bentham, G. (1833), Labiatarum Genera et Species 3: 318 [tax. nov.]

• Type: "Hab. in America septentrionali: in Arkansas Nutall! in Mexico provincia Taxas add Bejar et Rio de la Trinidad Herb. Hooker! in Nova Hispania Lagasca. (h. s. sp. comm. a cl. Hooker et v.s. sp. in herb Torrey, Lambert, etc.)."

Bailey, F.M. (1890), A Synopsis of the Queensland Flora Suppl. 3: 53 [secondary reference]

Bailey, F.M. (1913), Comprehensive Catalogue of Queensland Plants: 388 [secondary reference]

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