Trigonospermum is a genus of Mesoamerican plants in the family Asteraceae.Lessing, Christian Friedrich. 1832. Synopsis Generum Compositarum 214 in LatinTropicos, Trigonospermum Less.Davidse, G., M. Sousa-Peña, S. Knapp & F. Chiang Cabrera. 2015. Asteraceae. 5(2): ined. In G. Davidse, M. Sousa Sánchez, S. Knapp & F. Chiang Cabrera (eds.) Flora Mesoamericana. Universidad Nacional Autónoma de México, México D.F.
SpeciesFlann, C (ed) 2009+ Global Compositae Checklist Trigonospermum adenostemmoides Less. - Chiapas, Veracruz Trigonospermum annuum McVaugh & Lask. - Jalisco Trigonospermum auriculatum B.L.Turner - Guerrero Trigonospermum hintoniorum B.L.Turner - Tamaulipas, Nuevo León Trigonospermum melampodioides DC. - Oaxaca, Chiapas, Michoacán, Jalisco, Guerrero, Sinaloa, Morelos, Nayarit Trigonospermum stevensii S.D.Sundb. & Stuessy - Nicaragua, Guatemala
formerly included see Sigesbeckia Trigonospermum blakei - Sigesbeckia blakei
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