Pistil length and width, pollen diameter, pollen tube elongations, fruitset, seedset and germination rates in european invasive populations of Ludwigia grandiflora subsp. hexapetala in the two floral morphs

<p>Mating system influences local population genetic structure, effective size, offspring fitness and functional variation. Determining the respective importance of self- and cross-fertilization in hermaphroditic flowering plants is thus important to understand their ecology and evolution. The worldwide invasive species, <em>Ludwigia </em><em>grandiflora</em> subsp. <em>hexapetala </em>(<em>Lgh</em>) presents two floral morphs: one self-compatible short-styled morph (S-morph) and one self-incompatible long-styled morph (L-morph). Most invasive populations worldwide are only composed of self-incompatible L-morphs, which questions the importance of sexual reproduction during the invasion. In this study, we identified the mating systems of western European experimental and natural populations of <em>Lgh </em>by comparing structural characteristics of pollen and style, by studying self- and cross-pollen tube elongations and the viability of the resulting seeds and seedlings in both morphs. The dataset provides measures of pistil length and width; pollen diameter; pollen tube elongations along time after pollination; fruitset, seedset and germination rate in in situ monomorphic L-morph and S-morph populations of western europe invasive <em>Lgh</em>. These data support the manuscript &quot;Late-acting self-incompatible system, preferential allogamy and delayed selfing in the heterostylous invasive populations of <em>Ludwigia grandiflora</em> subsp. <em>hexapetala</em>&quot; by Luis O. Portillo Lemus, Marilyne Harang, Michel Bozec, Jacques Haury, Solenn Stoeckel and Dominique Barloy arguing for a mixed mating system in a European invasive populations of <em>Ludwigia grandiflora</em> subsp. <em>hexapetala.</em></p> <p>&nbsp;</p> <p>&nbsp;</p>