Abstract

PEREZ, Beatriz  and  APOSTOLO, Nancy M.. Morfoanatomía comparada del vástago adulto de Conyza bonariensis var. bonariensis y C. bonariensis var. angustifolia (Asteraceae). Bonplandia [online]. 2022, vol.31, n.1, pp.27-46. ISSN 0524-0476.  http://dx.doi.org/10.30972/bon.3115805.

Conyza bonariensis, a medicinal species and important weed native to Argentina, is represented by the varietiesC. bonariensisvar.bonariensisandC. bonariensisvar.angustifolia. The aim of this work is to compare the morphology and anatomy of the shoots of both varieties in their adult phase in order to contribute to their identification. Specimens in the vegetative and reproductive state collected from natural populations were analyzed. The shoots were divided into three zones, upper, middle and lower, to characterize their morphoanatomy using conventional techniques for light and scanning electron microscopy. Among the characteristics found to have diagnostic value are the size, shape and margin of the leaves, type of indumentum, density of trichomes and stomata, type of mesophyll and shape of the chlorenchyma cells in the stems. Many of these characteristics were not constant among the different zones of the shoot, particularly in the vegetative shoots. These results indicate that there are qualitative and quantitative morphoanatomical characters that allow the taxonomic identification ofC. bonariensisat the infraspecific level, which in turn may vary depending on the type and zone of the adult shoot analyzed.

Keywords : Anatomy; Conyza; medicinal plants; secretory structures; trichomes; weeds.

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