| Table of contents Act. Bot. Mex n.93 Pátzcuaro Oct. 2010 The vascular epiphytic flora of the State of Hidalgo, Mexico: diversity and distribution Ceja-Romero, Jacqueline; Mendoza-Ruiz, Aniceto; López-Ferrari, Ana Rosa; Espejo-Serna, Adolfo; Pérez-García, Blanca; García-Cruz, Javier
| | Ceratium Schrank (Dinophyceae) of the National Park Sistema Arrecifal Veracruzano, Gulf of Mexico , with a key for identification Okolodkov, Yuri B.
| | Pitcairnia yocupitziae (Bromeliaceae; Pitcairnioideae), a remarkable new species from Guerrero, Mexico Espejo-Serna, Adolfo; López-Ferrari, Ana Rosa
| | Embryo rescue of intergeneric hybrids Helianthus annuus x Tithonia rotundifolia Gómez-Martínez, Martha; Reyes-Valdés, M. Humberto; Martínez-Reyna, Juan Manuel; Escobedo-Bocardo, Leticia; García-Osuna, Hermila T.
| | Simsia bicentenarialis (Compositae-Heliantheae) a new species of the central part of Mexico Rzedowski, Jerzy; Calderón de Rzedowski, Graciela
| | Four new species of Verbesina (Compositae: Heliantheae) from the central part of Mexico Carrillo-Reyes, Pablo; Rzedowski, Jerzy; Calderón de Rzedowski, Graciela
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