Convolvulaceae of Sonora, Mexico. II. Cuscuta. J. Bot. Res. Inst. Texas 6 (2): 529-550.
Mihai Costea, Richard S. Felger, Daniel F. Austin, Thomas R. Van Devender, Jesús Sánchez-Escalante
published: 2012 | Research publication | Article
This article is the second part of a comprehensive floristic and taxonomic study of the Convolvulaceae occurring in the state of Sonora, Mexico in which we examine the parasitic genus Cuscuta (dodder). We document for the first time 21 species belonging to subgenus Grammica, the largest and most complicated taxonomically infrageneric group of Cuscuta. Sonoran dodders represent about a third of the total number of species found in Mexico, and the diversity of species is most similar to that of Baja California and Arizona (12 and 11, respectively species in common), followed by New Mexico (nine species in common). The best represented in Sonora is C. umbellata clade, with seven of the nine North American species growing in this geographical area. Two species, C. campestris and C. indecora, are invasive agricultural pests that have likely been introduced in Sonora with contaminated alfalfa seeds. We revise the nomenclature and typification of all the taxa. Dichotomous identification keys, detailed descriptions, phenology, host range, local and global geographic distribution data are provided.
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