Abstract

MOLLARD, Federico; HOC, P.  and  PALACIOS, R.. Prosopis abreviata Bentham, palynological evidences on its probable hybrid origin. Multequina [online]. 2000, vol.9, n.1, pp.1-6. ISSN 1852-7329.

Prosopis abbreviata is an endemic species in central west Argentina. Its distribution and morphology have been analyzed within the framework of the PROFLORA Argentina project, reaching the conclusion that in a community located in the province of San Juan individuals of P. torquata, P. strombulifera and P. abbreviata co-existed. Part of the P. abbreviata individuals exhibited intermediate characters from the two first species. Thus, the hypothesis that P. abbreviata could be a hybrid was posed. In order to corroborate this, morphological studies and studies of pollination viability were ndFragment-->done in the individuals of the three species growing in simpathry. The obtained results indicate that P. abbreviata because of its very low viability, bad exine structure and addition of the exine sculpture could be a hybri. or perhaps an (introgresante) originated by cross pollination between P. torquata and P. strombulifera, thus corroborating prior observations referred to P. burkartii (Picca et al., 1990).

Keywords : Pollination viability; Cross pollination; San Juan.

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