| Table of contents Act. Bot. Mex n.84 Pátzcuaro Jul. 2008 Tetrachyron Omissum and Trigonospermum alexandri, two new species of Compositae-Heliantheae from the central part of Mexico Rzedowski, Jerzy; Calderón de Rzedowski, Graciela; Pérez-Calix, Emmanuel
| | Thompsonella nellydiegoae (Crassulaceae), a new species from southern Mexico Carrillo-Reyes, Pablo; Pérez-Calix, Emmanuel
| | Note on the geographical distribution and morphology of Manfreda involuta (Agavaceae) Rodríguez, Aarón; Carrillo-Reyes, Pablo; Castro-Castro, Arturo
| | Vascular plants and vegetation of the upper part of Agua Fria stream in the municipality of Minatitlan, Colima, Mexico Padilla Velarde, Eloy; Cuevas Guzmán, Ramón; Koch, Stephen D.
| | The collections of legumes made by George B. Hinton, deposited in the herbarium of the Royal Botanic Gardens, Kew Rico Arce, María de Lourdes; Rodríguez, Amparo; Moreno-Gutiérrez², Elizabeth
| | Protoperidinium Bergh (Dinophyceae) of the National Park Sistema Arrecifal Veracruzano, Gulf of Mexico, with a key for identification Okolodkov, Yuri B.
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