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Acta botánica mexicana
On-line version ISSN 2448-7589Print version ISSN 0187-7151
Abstract
RZEDOWSKI, Jerzy; CALDERON DE RZEDOWSKI, Graciela and PEREZ-CALIX, Emmanuel. Tetrachyron Omissum and Trigonospermum alexandri, two new species of Compositae-Heliantheae from the central part of Mexico. Act. Bot. Mex [online]. 2008, n.84, pp.1-8. ISSN 2448-7589.
Tetrachyron omissum and Trigonospermum alexandri are illustrated and described as new species. The first grows in northeastern Querétaro and is related to T. websteri (Wussow & Urbatsch) B. L. Turner. The second is an aquatic or subaquatic plant known only from two pools in the vicinity of the town of Santa Clara del Cobre in northern Michoacán. It is possibly related to T. adenostemoides Less.
Keywords : México; Michoacán; Querétaro; Tetrachyron; Trigonospermum.