Abstract
A nomenclatural revision of fifteen taxa of Xyris (Xyridaceae) described by L.A. Nilsson (1892) is presented as part of a taxonomic revision of the genus in Brazil. All the protologues and type collections of these taxa were studied. The type collections were examined in the respective herbarium collections where they are preserved and complemented by images available on herbarium websites and from JSTOR Global Plants. Lectotypes were selected for Xyris cristata L.A.Nilsson, X. glaziowii L.A.Nilsson and X. insignis L.A.Nilsson. The holotypes, of X. glandacea L.A.Nilsson and X. stenophylla L.A.Nilsson, were discovered at the herbaria of Uppsala (UPS) and Berlin (B) respectively, and provided with their correct determinations.
Highlights
The family Xyridaceae comprises about 400 species (Wanderley 2011, Silva and Wanderley 2013, Mota and Wanderley 2014, Santos-Guedes and Wanderley 2015), of which approximately 92% occur in Brazil (Flora do Brasil 2016)
While undertaking taxonomic studies of Brazilian Xyridaceae, it was discovered that a number of species of the genus Xyris needed nomenclatural revision
In some cases, unrecognized type material was found in the general collections of herbaria with the consequence that these types are not available on herbaria websites or by JSTOR Global Plants (Ithaka 2015)
Summary
The family Xyridaceae comprises about 400 species (Wanderley 2011, Silva and Wanderley 2013, Mota and Wanderley 2014, Santos-Guedes and Wanderley 2015), of which approximately 92% occur in Brazil (Flora do Brasil 2016). In his Xyris glandacea protologue, Nilsson (1892) cited the Regnell III 2065 collection, and indicated UPS as the herbarium where it was deposited. In the protologue Nilsson (1892) indicated only the Martius collection without collector number, collected in Brazil, Minas Gerais state, in the Serra do Caraça, and deposited at the Munich herbarium (M).
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