Phytologia (November 1996) 81(5);348-360. REVISIONARY STUDY OF THE GENUS MILLERIA (ASTERACEAE, HELIANTHEAE) B.L. Turner & Kirsten Triplett Department of Botany, University of Texas, Austin, Texas 78713 U.S.A. ABSTRACT The genus Milleria is treated as having two species, a widespread tropical or subtropical weedy annual, M. quinqueflora, (including the recently described M. peruviana H. Rob) and M. perfoliata B.L. Turner, spec, nov., which is proposed to accommodate a single collection from El Tuito, Jalisco, having features markedly different from those of M. quinqueflora, with which it grows. These include: glabrous stems, smaller, markedly perfoliate leaves, smaller heads with more numerous (6-8 vs. 4) yellow (vs. green), disk florets, and yellow anthers (vs. purplish-black). Detailed distributional maps are provided. KEY WORDS: Asteraceae, Milleria, Heliantheae, systematics Milleria, a very distinct genus containing only one or two annual herbs, was first proposed by Linnaeus in 1735 and formally established by him in the first edition of his Species PUmtarum. As originally proposed it was thought to comprise two species, M. quinqueflora L. and M. biflora L., but the latter was subsequently removed and given generic status as Delilia {cf., Delprete 1995). Most recent workers have treated Milleria as monotypic, but H. Robinson (1981) proposed an additional species, M. peruviana H. Rob., at the time thought to be confined to Peru. We have reduced the latter to synonymy with M. quinqueflora but the senior author has felt compelled to propose yet another taxon for the genus, M. perfoliata B.L. Turner, from a single bizarre collection made in Jalisco, Mexico, where it co-occurs with M. quinqueflora. 348
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