Abstract

GROSSI, Mariana A; GUTIERREZ, Diego G; MARQUEZ, Gonzalo J  and  LUNA, María Luján. Caracteres florales y palinológicos en Acanthostyles (Asteraceae, Eupatorieae) y su relación con la polinización. Bol. Soc. Argent. Bot. [online]. 2017, vol.52, n.1, pp.107-119. ISSN 1851-2372.

Wind pollination in Asteraceae is well documented only in few tribes. Particularly, in Eupatorieae, apparent anemophily has only been reported in 10 species belonging to the genera Critonia, Decachaeta, Eupatorium, Koanophyllon, and Neohintonia, most of which inhabit North and Central America, with only two species from South America. The genus Acanthostyles has only one species, Acanthostyles buniifolius, which is widely distributed in southern South America. This species shows features that may suggest a pollination mechanism mediated by wind. We analyzed in detail some morphological and palynological traits related to the anemophilous syndrome. As a result, we identified some characters of A. buniifolius associated to wind pollination: presence of loose and pendulous secondary inflorescence with mainly downward oriented small heads, increased of proportion of stigmatic area in relation to the total length of the style branch, acicular style sweeping laxly arranged and wide-caveate, microechinate (= subechinate) pollen. This paper proposes first evidence of possible anemophily for a species of subtribe Dysinaphiinae within the Eupatorieae tribe.

Keywords : Acanthostyles; Anemophily; Austroeupatorium; Eupatorieae; South America.

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