Odontonema, the toothedthreads or firespikes, is a genus of flowering plants in the family Acanthaceae. It includes 32 species native to the tropical Americas, ranging from Mexico to Peru and southeastern Brazil.

Species 32 species are accepted: Odontonema albiflorum Leonard Odontonema album V.M.Baum Odontonema aliciae Odontonema ampelocaule Odontonema amplexicaule Nees Odontonema auriculatum (Rose) T.F. Daniel Odontonema barlerioides Odontonema bracteolatum (Jacq.) Kuntze Odontonema brevipes Urb. Odontonema callistachyum (Schltdl. & Cham.) Kuntze Odontonema corymbulosum Odontonema cuspidatum (Nees) Kuntze – Mottled toothedthread Odontonema dissitiflorum Odontonema fuchsioides Odontonema glaberrimum (M.E. Jones) V.M.Baum Odontonema glabrum Brandegee Odontonema guayaquilense Odontonema hondurense (Lindau) D.N.Gibson Odontonema laxum V.M.Baum Odontonema liesneri Wassh. Odontonema lindavii Odontonema mazarunensis Wassh. Odontonema microphyllus Durkee Odontonema mortonii V.M. Baum Odontonema nitidum (Jacq.) Kuntze – Shrubby toothedthread Odontonema peruvianum Odontonema rubrum (Vahl) Kuntze Odontonema rutilans (Planch.) Kuntze Odontonema schomburgkianum Kuntze Odontonema sessile Odontonema speciosum V.M. Baum Odontonema tubaeforme (Bertol.) Kuntze (syn. Odontonema strictum ) – Firespike

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