| Summary: | A floristic inventory of vascular plants was carried out in the high parts of the Agua Fría stream in the Municipality of Minatitlán, Colima, Mexico. Five divisions, six classes, 127 families, 423 genera and 716 species, and 36 infraspecific taxa are registered. Two hundred and sixty five of the species reported in this research represent new reports for the State of Colima. The best genera and species rich families are the Asteraceae (49 and 92, respectively), Leguminosae (35 and 74) and Poaceae (19 and 34). Similarly the best species rich genera are Eupatorium (15), Desmodium (12), Euphorbia (10), Ipomoea (8), Peperomia (8) and Quercus (8). The life form with highest representation are herbs with 46.77% of the species. Within the area 16 vascular plant species belong to some kind of risk category according to NOM-059-ECOL-2001. Eight of them are threatened species, six under special protection and two in danger of extinction. Five vegetation types and one transitional type are recognized and characterized.
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