Morphometric Analysis and Synopsis of Pseudognaphalium (Gnaphalieae, Asteraceae) in North America

SUSANA FREIRE; GROSSI, M.A.; BAYÓN, NÉSTOR; MONTI, CLAUDIA

ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS.

ACAD BRASILEIRA DE CIENCIAS

Lugar: Rio de Janeiro; Año: 2022

0001-3765

Pseudognaphalium Kirp. (Asteraceae, Gnaphalieae) consist of about 60 species mainlydistributed in South, Central, and North America. As a first contribution toward acomprehensive taxonomic review of Pseudognaphalium, we perform here the firstmorphometric analysis of North American species, using UPGMA method for theconstruction of the dendrogram. Based upon these results we present a synopsisincluding a key to identify species and their associate synonymy. Thirty seven speciesare recognized, two taxa are newly synonymized, Pseudognaphalium microcephalumunder the name P. canescens and Pseudognaphalium semilanatum under the name P.semiamplexicaule, and two other names are confirmed as synonyms as previouslyproposed, Pseudognaphalium micradenium as a synonym of P. helleri andPseudognaphalium crenatum as a synonym of P. viscosum. Lectotypes are newlydesignated for Gnaphalium beneolens, G. berlandieri (= Pseudognaphaliumstramineum), Gnaphalium decurrens (= Pseudognaphalium macounii), G.leucocephalum, G. oxyphyllum, G. oxyphyllum var. semilanatum (= P.semiamplexicaule), G. semiamplexicaule, G. sulphurescens (= P. stramineum), G.thermale, and second-step lectotypifications are proposed for G. helleri and G. wrightii(= P. canescens). In addition, the first illustrations of Pseudognaphalium helleri and P.semiamplexicaule, and a colour figure of P. canescens and P. beneolens emphasizingthe results of the morphometric analysis are provided.