Abstract
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.
Highlights
The genus Lessingianthus H.Rob. (Vernonieae, Asteraceae) comprises around 120 species widely distributed in Venezuela, Colombia, Peru, Brazil, Bolivia, Paraguay, Argentina and Uruguay (Robinson 1988)
For scanning electron microscopy (SEM), acetolysed pollen grains were first washed in 96 %, and 100 % alcohol, sputtered with goldpalladium and observed in a JEOL 5800 LV scanning electron microscope
Note — Lessingianthus cipoensis bears a resemblance to L. vestitus (Baker) H.Rob., but can be separated by its shorter and less branched inflorescence, acuminate phyllaries, ovate leaves and leaf blades 2.5 – 3.5 cm long
Summary
The genus Lessingianthus H.Rob. (Vernonieae, Asteraceae) comprises around 120 species widely distributed in Venezuela, Colombia, Peru, Brazil, Bolivia, Paraguay, Argentina and Uruguay (Robinson 1988). (Vernonieae, Asteraceae) comprises around 120 species widely distributed in Venezuela, Colombia, Peru, Brazil, Bolivia, Paraguay, Argentina and Uruguay (Robinson 1988). The genus is distinguished by the surface morphology of the pollen grains and the basic chromosome number. The pollen grains have been called type “B” by Keeley & Jones (1979) and they are tricolporate, echinolophate, with a discontinuous tectum, germinal furrows very long, converging at poles and lacunae disposed in a regular pattern, lacking a polar lacuna (Angulo & Dematteis 2010).
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