Cover: Portulaca teretifoloa(Portulacaceae) photo: José Luis Gómez

On the cover: From top to bottom, from left to right: Population of Dioon angustifolium Quercus sp. forest by María Magdalena Salinas-Rodriguez, Petrea volubilis by Arturo de Nova, Cactophagus spinolae on Stenocereus pruinosus by David Bravo-Avilez, Cosmoms palmeri by Hariberto Ávila-González, Manfreda singuliflora by Hariberto Ávila-González and general view of the Tacaná volcano, Mexico by Derio Antonio Jiménez-López

From top to bottom, from left to right: Anulocaulis hintoniorum by: George Hinton, Lithospermum hintoniorum by: George Hinton, Amaranthus palmeri with Apis melifera by: Alfredo Dorantes Euan, Fouquieria splendens by: Hugo Manuel Monreal García, Thebroma cacao by: Juana García -Flowers, Boletellus ananas by: Silvia Cappello and Carlos Ernesto González Chicas

Cover: From top to bottom, from left to right: Ageratina grandifolia by: Óscar Hinojosa Espinosa; association Borrichio-Rachicalletum americanae in coastal dunes of Cozumel by: Cruz López Contreras; Castilleja tenuiflora by: Gabriela Trejo Tapia; Borrichia arborescens (L.) DC. by: Cruz López Contreras; Washingtonia robusta by: Lucila Armenta-Méndez; cross section of base with vascular bundles of Echeveria aff. gigantea by: Esther Sandoval Zapotitla.

Cover: From top to bottom, from left to rigth: Magnolia perezferrerae, Borago longifolia, Calophyllum brasiliense, Gliricidia maculate, Gymnopodium floribundum and Coccoloba barbadensis.

Cover: From top to bottom, from left to right: Dry capsules and seeds of Agave potatorum, Agave potatorum, Sesbania virgate flowers and Amaranthus hypochondriacus.

Authors photographs: Yolanda D. Ortiz-Hernández (Agave potatorum), Fernando Tapia Pastrana (Sesbania virgate) and Iván Pável Moreno-Espíndola (Amaranthus hypochondriacus).

Composition: Alfredo Quiroz Arana

Cover: Authors photographs: Sergio Avendaño Reyes (Lithachne pauciflora), Teresa Mejia (Olmeca reflexa), Sergio Avendaño Reyes (Pseudechinolaena polystachya), Israel Castillo Juárez (Ceiba aesculifolia), Ana Rosa López Ferrari (Hechtia matudae) and Adolfo Espejo-Serna (Pitcairnia heterophylla).

Composition: Alfredo Quiroz Arana

Cover: From top to bottom, from left to right: Epidendrum greenwoodii, Pinguicula olmeca, Argemone platyceras, Pinguicula olmeca, Hebeloma alpinum with Pinus pringlei and Dichaea neglecta.

Authors photographs: Eloy Solano (Epidendrum greenwoodii), Carlos Burelo (Pinguicula olmeca), Kasey E. Barton (Argemone platyceras), Jesús Pérez-Moreno (Hebeloma alpinum with Pinus pringlei) and Mónica Pérez-Nicolás (Dichaea neglecta).

Composition: Alfredo Quiroz Arana

Cover: Habit and disposition of trichomes of Nostoc parmelioides.

Author: MSc Rogelio Rodríguez Flores.