Taxonomy of Hemizonia sect. Madiomeris (Asteraceae: Madiinae)

Abstract

Taxonomic review based on morphology, flavonoid chemistry, cytology, breeding experiments, and ecogeographic considerations suggests emendation of the circumscription of Hemizonia sect. Madiomeris and recognition of 17 taxa (14 species, one with two and one with three subspecies) within the section. New names are: Hemizonia increscens, H. increscens subsp. foliosa, and H. increscens subsp. villosa. Hemizonia martirensis, heretofore unassigned to a section, is included in sect. Madiomeris. Chromosome counts for 16 of the 17 taxa demonstrate an aneuploid series of n = 9, 10, 11, 12, and 13.