Abstract
SummaryThe identities of plants treated under the names Ipomoea goyazensis Gardner, I. bignonioides Sims, I. patula Choisy, I. fiebrigii Hassl. ex O’Donell, I. hirsutissima Gardner and I. carajasensis D. F. Austin are evaluated. It is shown that the name I. goyazensis should be used for the cerrado species often known under the name I. decora Meisn., rather than a plant from southern Brazil which is here described as a new species I. austrobrasiliensis J. R. I. Wood & Scotland. I. bignonioides Sims is synonymised with I. mauritiana Jacq., and an epitype is selected to fix the application of this name and ensure it is not confused with I. goyazensis. I. patula is lectotypified and treated as a synonym of the African I. crassipes Hook. The different recognised varieties of I. patula are evaluated; var. monticola Meisn. is treated as a species under the name I. langsdorffii Choisy; var. villosa Meisn. is shown to be a synonym of I. guaranitica Chodat & Hassl., in which is included the little-known species I. cornucopia Chodat & Hassl. Specimens from Paraguay, originally also treated as I. patula var. villosa or I. malvaeoides Meisn. var. ovata Hallier f., are treated as a distinct species named I. cordillerae J. R. I. Wood & Scotland. Plants from Brazil treated in various herbaria under the name of the Paraguayan species I. fiebrigii are shown to be a distinct species, which is described as new under the name I. angustissima J. R. I. Wood & Scotland. Species sometimes included in I. hirsutissima are discussed and a key to distinguish them is provided. I. pyrenea Taub. is illustrated and shown to be distinct and a plant from Paraguay sometimes named I. hirsutissima is described as new under the name I. megalantha J. R. I. Wood & Scotland. I. carajasensis D. F. Austin is shown to be a synonym of I. maurandioides Meisn. and plants from the cerrados of central Brazil often identified as this species are described as new under the name I. aequiloba J. R. I. Wood & Scotland. Two other commonly misunderstood species I. elegans A. Dietr. and I. serpens Meisn. are also discussed. All new species and some little-known species are illustrated, maps of contrasting distributions are provided and various lectotypifications are made to fix the concepts of several species discussed in this paper.
Highlights
During the course of our work in preparing a monograph of the genus Ipomoea L., we have become aware of a number of South American names which are misinterpreted in herbaria and the literature
Since only the occasional paper describing new species has been published apart from the flora accounts prepared by Dan Austin for Ecuador (Austin 1982a), Venezuela (Austin 1982b) and the Guiana Highlands (Austin 1998)
Materials and Methods This paper is based primarily on the study of the relevant literature cited in the list of references and a range of specimens which we have seen in different herbaria in Brazil, the United States and Europe
Summary
During the course of our work in preparing a monograph of the genus Ipomoea L., we have become aware of a number of South American names which are misinterpreted in herbaria and the literature. This is partly a consequence of the near absence of taxonomic, as opposed to nomenclatural, publications on South American species since the series of papers published by O’Donell (1948, 1950a, 1950b, 1952, 1953, 1959a, 1959b, 1960 inter alia). A recent paper by Austin et al (2015) has formalised and compounded a number of these misinterpretations and this paper aims to clarify and correct the most important of these
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