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Issue: Vol. 618 No. 2: 3 Oct. 2023
Type: Article
Published: 2023-10-03
DOI: 10.11646/phytotaxa.618.2.3
Page range: 133-148
Abstract views: 125
PDF downloaded: 12

Calea × crassa (Neurolaeneae: Asteraceae), a new nothospecies from Paraná state, Brazil

Universidade Federal do Rio Grande do Sul; Programa de Pós-graduação em Botânica; Laboratório de Sistemática Vascular; Prédio 43432; sala 107; Porto Alegre; RS 91501-970; Brazil; Jardim Botânico da Fundação Zoobotânica de Belo Horizonte – Belo Horizonte; MG 31364-450; Brazil
Universidade Federal do Rio Grande do Sul; Programa de Pós-graduação em Botânica; Laboratório de Ficologia; Museu de Ciências Naturais - Sema/RS; Porto Alegre; RS 90690-000; Brazil
Centro Universitário Una; Belo Horizonte; MG; Brazil
Universidade Estadual de Mato Grosso do Sul; Laboratório de Macroecologia & Evolução (LAMEV); BR-163; Mundo Novo; MS. Brazil; 79980-000; Brazil
Embrapa Clima Temperado; Rodovia BR 392; km 78; Caixa Postal 403; Pelotas; RS 96010-971; Brazil
Eudicots Compositae Escarpa Devoniana Grasslands Hybrid Niche modelling

Abstract

Calea × crassa, a new nothospecies is described and illustrated. The thickened pale olivaceous leaf margins along with the mucronate teeth are unique morphological features shared with its parental species C. ilienii and C. monocephala. The nothospecies can be distinguished from C. ilienii by the concolorous leaves (vs. discolorous leaves), involucre 6-seriate (vs. 5-seriate), second series of phyllaries with foliaceous base (vs. scarious base), and bigger scales 1.8–1.9 mm long, when present (vs. 1–1.5 mm, when present). It is differentiated from C. monocephala by the third series of phyllaries with acuminate apex (vs. apiculate, sometimes rounded), the narrow oblong sixth series of phyllaries (vs. oblanceolate, when present), and the bigger scales 1.8–1.9 mm long, when present (vs. 2.1–2.2 mm, when present). In addition to these characters, a principal component analysis also supports the traits differentiating the new hybrid from its parental taxa. Geographic distributions of C. × crassa and its parental species are mapped, including a modelled prediction occurrence map for the nothospecies. A taxonomic key for identification of the parents and the nothospecies is provided and the key morphological characters of these three taxa are illustrated.

 

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