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New species names and combinations in mexican bidens asteraceae coreopsideae

New species names and combinations in mexican bidens asteraceae coreopsideae

Phytologia 69(1): 20-31

In the preparation of a taxonomic treatment of Bidens for Mexico we have found it necessary to describe three new species: B. balsana T. Melchert (from Guerrero), B. oaxacana T. Melchert (from Oaxaca), and B. saltillensis T. Melchert (from Coahuila); two new varieties: B. aequisquama (Fern.) Sherff var. guanajuatensis T. Melchert (from Guanajuato) and B. sharpii (Sherff) T. Melchert var. tamazulapana T. Melchert (from Puebla and Oaxaca); four new specific combinations: B. cronquistii (Sherff) T. Melchert, B. hintonii (Sherff) T. Melchert, B. pueblensis (Sherff) T. Melchert, and B. sharpii (Sherff) T. Melchert; and four new varietal combinations: B. acrifolia Sherff var. langlassei (Sherff) T. Melchert, Bidens chiapensis Brandegee var. feddemana (Sherff) T. Melchert, comb. nov. B. odorata Cav. var. rosea (Schultz-Bip). T. Melchert, and B. schaffneri (A. Gray) Sherff var. wrightii (A. Gray) T. Melchert. When appropriate, the relationships of these various taxa are discussed. Especially noteworthy is the treatment of B. cronquistii and B. hintonii, both of which were originally positioned in the genus Coreocarpus, and B. acrifolia var. langlassei which is transferred from Cosmos.

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