| Gaia: | Pollen grains morphology of 7 families and 21 species from the Estación de Biología Chamela, Jalisco, of the Universidad Nacional Autónoma de México is studied and illustrated. The following taxa are included: Amaranthaceae represented by Achyranthes aspera L., Alternanthera cf. pycnantha (Benth.) Standl., Amaranthus retroflexus L., Chamissoa altissima (Jacq.) H.B.K., Froelichia interrupta (L.) Moq., Gomphrena decumbens Jacq., Iresine calea (Ibáñez) Standl., I. interrupta Benth. and Lagrezia monosperma (Rose) Standl.; Combretaceae by Combretum fruticosum (Loefl.) Stuntz and C. mexicanum (L.) Mow.; Loasaceae by Gronovia scandens L. and Mentzelia aspera L.; Loganiaceae by Strychnos cf. brachistantha Standl.; Martyniaceae by Martynia annua L.; Papaveraceae by Argemone ochroleuca subsp. ochroleuca Sweet; Tiliaceae by Heliocarpus pallidus Rose, Luehea candida (DC.) Mart. and Triumfetta acracantha Hochr.; Violaceae by Hybanthus attenuantus (Humb. & Bonpl.) G. K. Schulze, H. mexicanus Ging. and H. serrulatus Standl. The observations of pollen grains were carried out with scanning electron microscopy and light microscopy. Taxonomic keys for separation of genera and species of pollen grains in the Amaranthaceae, Loasaceae and Tiliaceae are included.
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