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Iva corbinii is described from the Colorado River bottoms of Travis County, Texas, to which it appears restricted. It is a remarkably distinct species, having predominately axillary, single heads; its closest relationship appears to be with I. axillaris, but differs from that taxon by numerous traits, most noteworthy by its involucres, which are composed of non-united bracts, suggesting a primitive position in the genus Iva. A photograph of the type collection is provided, along with a colored picture of its eponymous collector standing amongst a living population of the taxon.
Forestiera neomexicana is relatively constant in diagnostic features of vestiture and leaf shape across most of its range in the southwestern USA, from California to New Mexico and into western Texas. Apparent intermediacy in leaf shape and vestiture with F. pubescens, however, as well as glabrous forms of F. pubescens, have complicated identification. The two taxa are treated here as the eastern F. pubescens var. pubescens and the western F. pubescens var. parviflora. The ranges of the two taxa are mapped and variant forms are shown in Texas. Synonymy and typification are provided.
Sida [sect. Nelavaga] subsect. Conglomerata is described as a new subsection of the genus, including eight species from South America. Two of the eight are newly described: Sida calva and S. florulenta. The group is characterized by having flowers and fruits borne in axillary glomerules.
Roldana uxordecora is described from Oaxaca, Mexico (Municipio de San Mateo Río Hondo). The genus Roldana is common in the montane regions of the state of Oaxaca (22 species), and this addition to Roldana adds to a list of endemic species, now five, already collected from this montane region.