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| Dematteis, M.; Angulo, M.B.. |
| The genus Stenocephalum (Vernonieae, Asteraceae) includes six South American species that have cylindrical heads, 4–11 florets by capitula, cymose inflorescences and type ‘C’ pollen. Until now, Stenocephalum monticola has been considered as a synonym of S. apiculatum. However, the analysis of the type material and additional specimens indicate that it is a quite different species, which differs in leaf size, pubescence and capitula arrangement. Stenocephalum monticola has leaves of 9–20 mm long, leaf blades villous at the base and capitula agglomerate at the stems tips, while S. apiculatum presents leaves of 30–60 mm long, leaf blades basally glabrous and heads mostly solitary, arranged in a pseudo-spiciform inflorescence. Consequently, in this paper S.... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Vernonia; Compositae; South America; Brazil; Taxonomy. |
| Ano: 2008 |
URL: http://www.repository.naturalis.nl/record/524666 |
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| Dematteis, M.; Angulo, M.B.. |
| Two new species of the genus Lessingianthus (Vernonieae, Asteraceae) from Brazil and Paraguay are described and illustrated. Lessingianthus cipoensis is characterized by the presence of solitary heads disposed in short branches and ovate to elliptical leaves. It has a certain resemblance to L. vestitus, which has more branched inflorescences, with long branches, and lanceolate to obovate-lanceolate leaves. Lessingianthus paraguariensis is closely related to L. asteriflorus and L. mollissimus, but it can be distinguished by the broadly elliptical leaves and the large size of the outer phyllaries. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Compositae; New species; South America; Taxonomy; Vernonia. |
| Ano: 2012 |
URL: http://www.repository.naturalis.nl/record/525043 |
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| Dematteis, M.. |
| Two additional species of Lessingianthus (Vernonieae, Asteraceae) from the Brazilian highlands are described and illustrated. One of the new species, Lessingianthus barrosoanus, is characterized by the presence of solitary heads disposed in relatively long, flexuous branches. It has certain resemblance to L. ligulifolius (Mart. ex DC.) H. Rob., which has short, commonly erect branches of the inflorescence, and capitula geminate or disposed in groups. Lessingianthus minimus is closely related to L. reitzianus (Cabrera) H. Rob., but differs in having acuminate phyllaries, glabrous corolla lobes and lanceolate leaves, cuneate at the base. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Asteraceae; Vernonieae; South America; New species; Taxonomy. |
| Ano: 2006 |
URL: http://www.repository.naturalis.nl/record/525220 |
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