Abstract

TORRES ROBLES, SS; PETER, G  and  TUR, NM. Notes on the sexual condition of Myriophyllum aquaticum, Haloragaceae. Phyton (B. Aires) [online]. 2011, vol.80, n.2, pp.133-138. ISSN 1851-5657.

Myriophyllum aquaticum (Vell.) Verdc. is native of South America and has a pantropical distribution. This species has been cited as dioecious, monoecious and polygamous. The purpose of this paper was to contribute to the discussion of its sexual condition, based on herbarium material, and supported by field observations. Herbarium material from Argentina was examined. Also, twenty branches from the Punta Lara Nature Reserve (Buenos Aires, Argentina) were periodically sampled to record the sex of flowers present on each whorl during the flowering period of 2002. Both in herbarium material and in field, we observed specimens with branches bearing either female or male, and specimens with female and male flowers on the same branch. Some of these materials have also fruits. Our observations support the idea that M. aquaticum is not a strictly dioecious species, at least in Argentina.

Keywords : Dioecy; Monoecy; Myriophyllum aquaticum; Punta Lara.

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